The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated.The results show that the major ions in shallow groundwater from the karst hi...The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated.The results show that the major ions in shallow groundwater from the karst hilly areas are mainly composed of HCO3-,SO42-,Ca2+ and Mg2+,and the concentrations scopes of NO3-,Cl-,K+ and Na+ of the groundwater in agricultural,residential and industrial areas are 4.5-9.6,2.8-7.1,3.9-6.3 and 2.5-4.9 times higher than those in the forest areas,respectively.The concentrations of As,Pb and Cd of shallow groundwater in the industrial areas are also significantly enhanced,followed by those in the residential areas and the agricultural areas.The concentrations of NO3-,SO42-,As,Pb and Cd of the groundwater in the industrial areas and those of NO3-,SO42-,As and Cd of shallow groundwater in the residential areas reach grade Ⅲ of the Groundwater Quality Standard of China(GB/T 14848-93),while the concentration of NO3-in the groundwater from the industrial areas exceeds grade Ⅴ.With the process of urbanization,NO3-is the key factor to influence the groundwater quality in karst hilly areas,followed by SO42-,As,Pb and Cd.展开更多
Based on the constitution identification of the urbanization economic costs,econometric model of urbanization economic costs is constructed from four aspects of the investment cost in employment opportunities,the inve...Based on the constitution identification of the urbanization economic costs,econometric model of urbanization economic costs is constructed from four aspects of the investment cost in employment opportunities,the investment cost in urban land use,the investment cost in urban infrastructure,and the investment cost in urban management.Taking Guiyang City as an example,economic cost for each additional urban population in Guiyang City is measured under the current level of social and economic development.Capital requirement for the urban development of Guiyang City in the next 10 years is forecasted.And it is pointed out that there will be significant financing gap in the sustainable development and urbanization process of Guiyang City in future,which provides the basis for the development speed and the reasonable goals of urban sustainable development in future.展开更多
The Guiyang Cotton Textile Mill adheres to the aim of "Quality First and Customers Supreme" and is active in carrying out technical renovation. The mill has introduced a stoke rotary screen printing machine ...The Guiyang Cotton Textile Mill adheres to the aim of "Quality First and Customers Supreme" and is active in carrying out technical renovation. The mill has introduced a stoke rotary screen printing machine from the Netherlands, on which it has produced Shanhua brand polyester/cotton rotary screen printed shirting. It was appraised as a famous brand product in 1994, and exports reached 12.23 million metres in 1995.展开更多
The report of the Nineteenth National Congress of the Communist Party of China clearly points out that we should speed up the reform of the ecological civilization system and build a beautiful China.Guizhou Province i...The report of the Nineteenth National Congress of the Communist Party of China clearly points out that we should speed up the reform of the ecological civilization system and build a beautiful China.Guizhou Province is one of the first demonstration zones of ecological civilization established by the State Council and themacro-ecological strategy is one of the three strategic actions of Guizhou Province.展开更多
From July 13 to 14,the“2019 China Eco-Civilization Construction Forum”,jointly sponsored by Chinese Ecological Economics Association and the journal of Ecological Economy and hosted by School of Economics,Guizhou Un...From July 13 to 14,the“2019 China Eco-Civilization Construction Forum”,jointly sponsored by Chinese Ecological Economics Association and the journal of Ecological Economy and hosted by School of Economics,Guizhou University was held in Guiyang City,Guizhou Province.The theme of the conference is Ecological Economy and Rural Revitalization.About 150 experts and scholars from more than 100 universities and research institutions attended the forum.Experts and scholars attending the meeting conducted in-depth discussions and exchanges on the system and mechanism of eco-civilization construction in the new era,ecocivilization and social responsibility,ecological economics theory and green development,rural revitalization and ecological poverty alleviation,ecological environment and ecological industry,ecological protection and ecological compensation.展开更多
The Guiyang Steelworks is a national key special steelworks, and also one of the country’s national largest 500 industrial enterprises. At present, it has formed an annual production capacity of 300 thousand tons of ...The Guiyang Steelworks is a national key special steelworks, and also one of the country’s national largest 500 industrial enterprises. At present, it has formed an annual production capacity of 300 thousand tons of steel and 310 thousand tons of steel products. It owns eight production branch steelworks for electric furnance steel-making, rolling steel, forging steel, steel tube, rock drilling steel and building materials, and their relevant auxiliary matching systems. It has established two research institutes: a Special Steel Research Institute and a Rock Drilling Steel Research Institute. It is the national largest base for rock drilling steel production and scientific research,展开更多
Guiyang is located in southwestern China,which is a famous tourism city,and is awarded the title of"the Summer Capital of China".A study on heavy metals in Guiyang urban soils was conducted.The results showe...Guiyang is located in southwestern China,which is a famous tourism city,and is awarded the title of"the Summer Capital of China".A study on heavy metals in Guiyang urban soils was conducted.The results showed that the concentrations of Cd,Cu,Ni,Pb and Zn in Guiyang urban soils are significantly higher than their background values and Cu,Zn and Pb in Guiyang soils are accumulated seriously.The distribution characteristics of heavy metals in 3 districts are described as follows:the level of heavy metals in soils follows the order of Nanming District> Yunyan District>Xiaohe District.The spatial distribution of metals in urban soils of Guiyang shows that the level of metals in the central and eastern parts of Guiyang is relatively high,and its characteristics are attributed to the influence of commercial activities,heavy traffic and industrial emission.Compared with some other cities in China,Guiyang is characterized by relatively high accumulation level of Cd,Cu,and Zn in its soils.展开更多
Based on the results of multipurpose regional geochemical surveys of the Guizhou Province, geochemical characteristics of soil Se and Se-rich land resources in the central area of Guiyang City were studied and evaluat...Based on the results of multipurpose regional geochemical surveys of the Guizhou Province, geochemical characteristics of soil Se and Se-rich land resources in the central area of Guiyang City were studied and evaluated.Major conclusions are as follows:(1) the Se content in surface soil of the central area of Guiyang City was 0.17–2.89 mg kg^(-1), and the average was 0.78 mg kg^(-1), which were respectively 2.6 and 3.9 times of the national background value of soil and the world background value of soil.The Se content in deep soil was 0.11–1.48 mg kg^(-1), and the average was 0.44 mg kg^(-1), which were respectively 1.5 and2.2 times of the national background value of soil and the world background value of soil. The soil Se content decreased with the increase in the soil depth on the vertical profile, and the surface soil had a higher Se content.(2)Distribution of Se content was mainly affected by parent material, physicochemical properties of soil and other components, soil type, and land use type. Parent material played a key role, as the soil Se content was mainly originated from parent rock and increased with the background value of Se in parent rock, physicochemical properties of soil and other components had certain influences upon the Se content. Se was shown to have a significant linear positive correlation with S and organic carbon but no significant correlation with p H value. Se content varied with different types of soil as follows: skeleton soil > yellow soil > paddy soil > limestone soil > purple soil. Land use type also hadcertain influences upon the soil Se content as follows: dry land > construction land > garden plot > grassland =garden plot > forest land.(3) Taking 0.4 mg kg^(-1)B x(Se) <3.0 mg kg^(-1) as the standard for Se-rich soil, Se-rich soil of the study area covered an area of 2224 km^2 and 92.5% of the total area; the remaining is general soil. The study area had no Se-excess soil. Therefore, the central area of Guiyang City has a high proportion of Se-rich land, a large area of Serich land resources, and a moderate selenium enrichment strength, which have been rarely seen anywhere and provide advantageous resources for the development of Se-rich featured agriculture.展开更多
Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣR...Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate rocks, and ranges from 0.01 to 0.43, from 0.03 to 0.27, from 0.03 to 0.19 and from 0.05 to 1.38 μg·L-1 for dolomite, dolomitic & limestone, limestone and clastic rock aquifer, respectively. Both distributions and contents of rare-earth elements (REE) in karst groundwater reflect the lithology of host rocks or weathering crusts of carbonate rocks through which groundwater flows. The chondrite-normalized patterns show a non-flat profile with higher enrichment of slightly light rare-earth elements (LREE) than heavy rare-earth elements (HREE), prominent fractionation between LREE and HREE, negative Ce anomalies and negative or positive Eu anomalies. There is more obvious fractionation between LREE and HREE in groundwater than that in carbonate rocks and their weathering crusts due to high contents of HCO3? and PH in groundwater. In shallow karst groundwater, REE(CO3)n2n-3 (n=1 and 2) is the main inorganic species of REE. But for a clastic rock aquifer, both REESO4+ and REECO3+ are the main inorganic species of REE. Species of REE in groundwater is closely associated with the hydrochemical type of groundwater which is predominated by the lithology of host rocks, groundwater-rock interaction and weathering-pedogenesis of carbonate rocks.展开更多
Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total con-centrations and sequential extraction of Cr,Cu,Pb,Zn and Cd by ICP spectrometry. The average total concentrations...Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total con-centrations and sequential extraction of Cr,Cu,Pb,Zn and Cd by ICP spectrometry. The average total concentrations of Cr,Cu,Pb,Zn and Cd in the soils of Guiyang were 92.9,51.6,44.1,139.3 and 0.28 mg/kg,respectively. The soils have been polluted by Cr,Cu,Pb,Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr,Cu,Pb,Zn and Cd in different functional zones. As for the sequential extraction,Cr,Cu and Zn were present mainly in the residual fraction,and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%,and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd>Pb>Cu>Cr>Zn.展开更多
High-resolution ultrasonography was used to analyze the nerve cross-sectional area (CSA) of the median nerve at 7 sites:the wrist crease,pisiform bone,hamate bone,6 cm proximal to the tip of the wrist crease,proximal ...High-resolution ultrasonography was used to analyze the nerve cross-sectional area (CSA) of the median nerve at 7 sites:the wrist crease,pisiform bone,hamate bone,6 cm proximal to the tip of the wrist crease,proximal forearm (where the nerve enters the pronator teres muscle),4 cm proximal to the tip of the medial epicondyle,and mid-humerus (mid-point between elbow crease and axilla) in 200 healthy volunteers from Guiyang,China.Results showed similar CSA values between the left and right sides,but the CSA 6 cm proximal to the tip of the wrist crease,proximal forearm,4 cm proximal to tip of the medial epicondyle,and mid-humerus in males was greater than that of females.Moreover,CSA values at the wrist crease,pisiform bone,and hamate bone were greater in the middle-aged and old groups when compared to the young group,and correlated with body mass and height.Thus,reference values of median nerve CSA of the upper limbs can facilitate the analysis of abnormal nerve conditions.展开更多
This paper describes the environmentally geochemical characteristics of heavy metal pollutants such as Cu and Zn in the surficial soil of Guiyang, the capital city of Guizhou Province. The baseline concentrations of h...This paper describes the environmentally geochemical characteristics of heavy metal pollutants such as Cu and Zn in the surficial soil of Guiyang, the capital city of Guizhou Province. The baseline concentrations of heavy metals in soil and the geochemical norms have been established to distinguish natural or artificial influence on the environment. Using the statistically analytical methods, we have established the baseline of Cu in Guiyang ({18.8} mg/kg) and the soil (over {68.4} mg/kg) may suffer Cu contamination. The data of Zn are {46.3} mg/kg and {112.0} mg/kg. Geoaccumulation index analysis indicated that the surficial soil that has suffered non-pollution to mid-pollution of Cu accounts for 38%, 38%, and 22% for mid-pollution, and only 2% between mid|pollution to severe pollution. Surficial soil that has suffered non-pollution to mid-pollution of Zn accounts for 41%, 50%, and 7% for mid-pollution, and only 2% between mid-pollution to severe pollution. The maximal degree of Cu contamination is 5.09 in the surficial soil of Guiyang. Surficial soil that has not suffered Cu pollution accounts for {53.2%}. The total pollution degree of Cu is slightly over zero. So the surficial soil of Guiyang has suffered slight Cu pollution. The maximum value of Zn contamination degree is {2.85} in the surficial soil of Guiyang. {77.8%} of the surficial soil has not yet suffered any Zn pollution. The total pollution degree of Zn is less than zero. So the surficial soil in Guiyang is free from pollution of Zn.展开更多
Guiyang is a famous tourist city located in southwestern China. In this study, dust from eleven residential areas, seven city squares, and nine schools was collected to measure the heavy metal levels and evaluate its ...Guiyang is a famous tourist city located in southwestern China. In this study, dust from eleven residential areas, seven city squares, and nine schools was collected to measure the heavy metal levels and evaluate its risk. At each sampling site, 4–5 sub-samples were taken as a bulk sample. All samples were air-dried, ground, passed through a 0.105 mm nylon sieve, digested with HNO3-HClO4 to determine the concentrations of Cd, Cu, Ni, Pb and Zn by ICP-MS, and digested with 1:1 aqua regia to determine As by AFS. The results show that the concentrations of As, Cd, Cu, Ni, Pb and Zn in dust of Guiyang City follow normal distribution with means of 16.1, 1.54, 138, 47.7, 129 and 479 mg/kg, respectively. Levels of As, Cd, Cu, Ni, Pb and Zn exceed the background level of soil in Guizhou Province by 33%, 96%, 100%, 78%, 96%, and 100%, respectively. Cd, Cu, Pb and Zn are heavily accumulated in dust of living areas with accumulation factors of 4.10, 5.12, 4.12 and 5.51, respectively. City square possesses the highest geometric means of As, Cd, Cu, Pb, and Zn. The risks of heavy metal exposure to teenagers are not obvious and in an order of As>Pb>Cu>Ni>Zn(Cd).展开更多
A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artifi...A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artificial nuclides(131I, 137 Cs, and 134Cs) and their global transportation by atmospheric circulation. This paper reports a systematic comparative observation on radioactive concentrations of natural nuclides(7Be and 210Pb) and artificial nuclides(131I, 137 Cs, and 134Cs) at the surface level, measured in weekly continuous aerosol sampling at Mount Guanfeng, Guiyang, China, from March 17, 2011 to April 28, 2011. During this period, the variations in the nuclide concentrations associated with their transport paths were analyzed with 315 hour back-trajectories of air mass initialized 500 m above the surface level at Guiyang. The results show that the pollutants of nuclear leakage from the Fukushima accident were transported to the Guiyang region of China via two significant pathways. In the first pathway the first wave of nuclear pollutants were transported from west to east in air masses at higher altitudes via global atmospheric circulation. The nuclear pollutants encircled the Earth almost once and after about 10 days to two weeks, between March 24 and March 31, 2011, intruded Guiyang from the northwestern region of China. In the second pathway, the nuclear pollutants from the Fukushima region arrived at Guiyang between April 7 and April 14, 2011, via air masses at lower altitudes that moved southwards because of the squeezing of the northeast Asian weather system and then by the influence, in succession, of the northeastern and southeastern air currents in the low-latitude region. The first transport pathway for atmospheric pollutants is on a global scale and based on air masses at higher altitudes, and the second transport pathway is on an eastern Asia regional scale and based on the air masses at lower altitude.展开更多
The aim of this study is to shed light on the hydrogeochemical characteristics of karst underground waters at shallow depth in Guiyang City, Guizhou Province with an emphasis on the geochemistry of major elements. Gui...The aim of this study is to shed light on the hydrogeochemical characteristics of karst underground waters at shallow depth in Guiyang City, Guizhou Province with an emphasis on the geochemistry of major elements. Guiyang City bears abundant underground waters and it is also an important representative of the karst areas throughout the world. Ca+{2+} and Mg+{2+} are the dominant cations, accounting for 81%-{99.7%} of the total, and HCO+--3 and SO+{2-}-4 are the dominant anions. Weathering of limestones and dolostones is the most important factor controlling the hydrogeochemistry of underground waters, and weathering of sulfate and evaporite rocks is less important. Moreover, the precipitation and human activities also have a definite influence on the hydrogeochemistry of underground waters in the region studied.展开更多
基金Project(2006CB403205) supported by the National Key Basic Research Program of ChinaProject(40961030) supported by the National Natural Science Foundation of China
文摘The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated.The results show that the major ions in shallow groundwater from the karst hilly areas are mainly composed of HCO3-,SO42-,Ca2+ and Mg2+,and the concentrations scopes of NO3-,Cl-,K+ and Na+ of the groundwater in agricultural,residential and industrial areas are 4.5-9.6,2.8-7.1,3.9-6.3 and 2.5-4.9 times higher than those in the forest areas,respectively.The concentrations of As,Pb and Cd of shallow groundwater in the industrial areas are also significantly enhanced,followed by those in the residential areas and the agricultural areas.The concentrations of NO3-,SO42-,As,Pb and Cd of the groundwater in the industrial areas and those of NO3-,SO42-,As and Cd of shallow groundwater in the residential areas reach grade Ⅲ of the Groundwater Quality Standard of China(GB/T 14848-93),while the concentration of NO3-in the groundwater from the industrial areas exceeds grade Ⅴ.With the process of urbanization,NO3-is the key factor to influence the groundwater quality in karst hilly areas,followed by SO42-,As,Pb and Cd.
基金Supported by the Key Projects in the National Science & Technology Pillar Program during the Eleventh Five-year Plan Period (2006BAJ14B4-02)
文摘Based on the constitution identification of the urbanization economic costs,econometric model of urbanization economic costs is constructed from four aspects of the investment cost in employment opportunities,the investment cost in urban land use,the investment cost in urban infrastructure,and the investment cost in urban management.Taking Guiyang City as an example,economic cost for each additional urban population in Guiyang City is measured under the current level of social and economic development.Capital requirement for the urban development of Guiyang City in the next 10 years is forecasted.And it is pointed out that there will be significant financing gap in the sustainable development and urbanization process of Guiyang City in future,which provides the basis for the development speed and the reasonable goals of urban sustainable development in future.
文摘The Guiyang Cotton Textile Mill adheres to the aim of "Quality First and Customers Supreme" and is active in carrying out technical renovation. The mill has introduced a stoke rotary screen printing machine from the Netherlands, on which it has produced Shanhua brand polyester/cotton rotary screen printed shirting. It was appraised as a famous brand product in 1994, and exports reached 12.23 million metres in 1995.
文摘The report of the Nineteenth National Congress of the Communist Party of China clearly points out that we should speed up the reform of the ecological civilization system and build a beautiful China.Guizhou Province is one of the first demonstration zones of ecological civilization established by the State Council and themacro-ecological strategy is one of the three strategic actions of Guizhou Province.
文摘From July 13 to 14,the“2019 China Eco-Civilization Construction Forum”,jointly sponsored by Chinese Ecological Economics Association and the journal of Ecological Economy and hosted by School of Economics,Guizhou University was held in Guiyang City,Guizhou Province.The theme of the conference is Ecological Economy and Rural Revitalization.About 150 experts and scholars from more than 100 universities and research institutions attended the forum.Experts and scholars attending the meeting conducted in-depth discussions and exchanges on the system and mechanism of eco-civilization construction in the new era,ecocivilization and social responsibility,ecological economics theory and green development,rural revitalization and ecological poverty alleviation,ecological environment and ecological industry,ecological protection and ecological compensation.
文摘The Guiyang Steelworks is a national key special steelworks, and also one of the country’s national largest 500 industrial enterprises. At present, it has formed an annual production capacity of 300 thousand tons of steel and 310 thousand tons of steel products. It owns eight production branch steelworks for electric furnance steel-making, rolling steel, forging steel, steel tube, rock drilling steel and building materials, and their relevant auxiliary matching systems. It has established two research institutes: a Special Steel Research Institute and a Rock Drilling Steel Research Institute. It is the national largest base for rock drilling steel production and scientific research,
基金supported by National Natural Science Foundation of China(41161079)the Science and Technology Department of Guizhou Province(SY[2010]3038)the Science Foundation of the Guizhou Province, China([2011]2092)
文摘Guiyang is located in southwestern China,which is a famous tourism city,and is awarded the title of"the Summer Capital of China".A study on heavy metals in Guiyang urban soils was conducted.The results showed that the concentrations of Cd,Cu,Ni,Pb and Zn in Guiyang urban soils are significantly higher than their background values and Cu,Zn and Pb in Guiyang soils are accumulated seriously.The distribution characteristics of heavy metals in 3 districts are described as follows:the level of heavy metals in soils follows the order of Nanming District> Yunyan District>Xiaohe District.The spatial distribution of metals in urban soils of Guiyang shows that the level of metals in the central and eastern parts of Guiyang is relatively high,and its characteristics are attributed to the influence of commercial activities,heavy traffic and industrial emission.Compared with some other cities in China,Guiyang is characterized by relatively high accumulation level of Cd,Cu,and Zn in its soils.
基金supported by outstanding science and technology education personnel special funds of Guizhou Province (Specific words in Guizhou Province (2012)No.27)National multipurpose regional geochemical survey Project (GZTR20070110)
文摘Based on the results of multipurpose regional geochemical surveys of the Guizhou Province, geochemical characteristics of soil Se and Se-rich land resources in the central area of Guiyang City were studied and evaluated.Major conclusions are as follows:(1) the Se content in surface soil of the central area of Guiyang City was 0.17–2.89 mg kg^(-1), and the average was 0.78 mg kg^(-1), which were respectively 2.6 and 3.9 times of the national background value of soil and the world background value of soil.The Se content in deep soil was 0.11–1.48 mg kg^(-1), and the average was 0.44 mg kg^(-1), which were respectively 1.5 and2.2 times of the national background value of soil and the world background value of soil. The soil Se content decreased with the increase in the soil depth on the vertical profile, and the surface soil had a higher Se content.(2)Distribution of Se content was mainly affected by parent material, physicochemical properties of soil and other components, soil type, and land use type. Parent material played a key role, as the soil Se content was mainly originated from parent rock and increased with the background value of Se in parent rock, physicochemical properties of soil and other components had certain influences upon the Se content. Se was shown to have a significant linear positive correlation with S and organic carbon but no significant correlation with p H value. Se content varied with different types of soil as follows: skeleton soil > yellow soil > paddy soil > limestone soil > purple soil. Land use type also hadcertain influences upon the soil Se content as follows: dry land > construction land > garden plot > grassland =garden plot > forest land.(3) Taking 0.4 mg kg^(-1)B x(Se) <3.0 mg kg^(-1) as the standard for Se-rich soil, Se-rich soil of the study area covered an area of 2224 km^2 and 92.5% of the total area; the remaining is general soil. The study area had no Se-excess soil. Therefore, the central area of Guiyang City has a high proportion of Se-rich land, a large area of Serich land resources, and a moderate selenium enrichment strength, which have been rarely seen anywhere and provide advantageous resources for the development of Se-rich featured agriculture.
基金supported by the National Basic Research Program (973) of China (No. 2006CB403202) the National Natural Science Foundation of China (No. 40463001)
文摘Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate rocks, and ranges from 0.01 to 0.43, from 0.03 to 0.27, from 0.03 to 0.19 and from 0.05 to 1.38 μg·L-1 for dolomite, dolomitic & limestone, limestone and clastic rock aquifer, respectively. Both distributions and contents of rare-earth elements (REE) in karst groundwater reflect the lithology of host rocks or weathering crusts of carbonate rocks through which groundwater flows. The chondrite-normalized patterns show a non-flat profile with higher enrichment of slightly light rare-earth elements (LREE) than heavy rare-earth elements (HREE), prominent fractionation between LREE and HREE, negative Ce anomalies and negative or positive Eu anomalies. There is more obvious fractionation between LREE and HREE in groundwater than that in carbonate rocks and their weathering crusts due to high contents of HCO3? and PH in groundwater. In shallow karst groundwater, REE(CO3)n2n-3 (n=1 and 2) is the main inorganic species of REE. But for a clastic rock aquifer, both REESO4+ and REECO3+ are the main inorganic species of REE. Species of REE in groundwater is closely associated with the hydrochemical type of groundwater which is predominated by the lithology of host rocks, groundwater-rock interaction and weathering-pedogenesis of carbonate rocks.
基金financially supported by the Ministry of Science and Technology of China through National Program on Key Basic Research Project (Grant No.2006 CB403200)
文摘Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total con-centrations and sequential extraction of Cr,Cu,Pb,Zn and Cd by ICP spectrometry. The average total concentrations of Cr,Cu,Pb,Zn and Cd in the soils of Guiyang were 92.9,51.6,44.1,139.3 and 0.28 mg/kg,respectively. The soils have been polluted by Cr,Cu,Pb,Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr,Cu,Pb,Zn and Cd in different functional zones. As for the sequential extraction,Cr,Cu and Zn were present mainly in the residual fraction,and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%,and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd>Pb>Cu>Cr>Zn.
基金the Science and Technology Foundation Program of Guizhou Province,No. J[2009]2157
文摘High-resolution ultrasonography was used to analyze the nerve cross-sectional area (CSA) of the median nerve at 7 sites:the wrist crease,pisiform bone,hamate bone,6 cm proximal to the tip of the wrist crease,proximal forearm (where the nerve enters the pronator teres muscle),4 cm proximal to the tip of the medial epicondyle,and mid-humerus (mid-point between elbow crease and axilla) in 200 healthy volunteers from Guiyang,China.Results showed similar CSA values between the left and right sides,but the CSA 6 cm proximal to the tip of the wrist crease,proximal forearm,4 cm proximal to tip of the medial epicondyle,and mid-humerus in males was greater than that of females.Moreover,CSA values at the wrist crease,pisiform bone,and hamate bone were greater in the middle-aged and old groups when compared to the young group,and correlated with body mass and height.Thus,reference values of median nerve CSA of the upper limbs can facilitate the analysis of abnormal nerve conditions.
基金This research project was granted by the Special Foundation for CollegeDevelopment of Guizhou, China ( Education and Science of Qian2004111).
文摘This paper describes the environmentally geochemical characteristics of heavy metal pollutants such as Cu and Zn in the surficial soil of Guiyang, the capital city of Guizhou Province. The baseline concentrations of heavy metals in soil and the geochemical norms have been established to distinguish natural or artificial influence on the environment. Using the statistically analytical methods, we have established the baseline of Cu in Guiyang ({18.8} mg/kg) and the soil (over {68.4} mg/kg) may suffer Cu contamination. The data of Zn are {46.3} mg/kg and {112.0} mg/kg. Geoaccumulation index analysis indicated that the surficial soil that has suffered non-pollution to mid-pollution of Cu accounts for 38%, 38%, and 22% for mid-pollution, and only 2% between mid|pollution to severe pollution. Surficial soil that has suffered non-pollution to mid-pollution of Zn accounts for 41%, 50%, and 7% for mid-pollution, and only 2% between mid-pollution to severe pollution. The maximal degree of Cu contamination is 5.09 in the surficial soil of Guiyang. Surficial soil that has not suffered Cu pollution accounts for {53.2%}. The total pollution degree of Cu is slightly over zero. So the surficial soil of Guiyang has suffered slight Cu pollution. The maximum value of Zn contamination degree is {2.85} in the surficial soil of Guiyang. {77.8%} of the surficial soil has not yet suffered any Zn pollution. The total pollution degree of Zn is less than zero. So the surficial soil in Guiyang is free from pollution of Zn.
基金supported by National Natural Science Foundation of China(41161079)
文摘Guiyang is a famous tourist city located in southwestern China. In this study, dust from eleven residential areas, seven city squares, and nine schools was collected to measure the heavy metal levels and evaluate its risk. At each sampling site, 4–5 sub-samples were taken as a bulk sample. All samples were air-dried, ground, passed through a 0.105 mm nylon sieve, digested with HNO3-HClO4 to determine the concentrations of Cd, Cu, Ni, Pb and Zn by ICP-MS, and digested with 1:1 aqua regia to determine As by AFS. The results show that the concentrations of As, Cd, Cu, Ni, Pb and Zn in dust of Guiyang City follow normal distribution with means of 16.1, 1.54, 138, 47.7, 129 and 479 mg/kg, respectively. Levels of As, Cd, Cu, Ni, Pb and Zn exceed the background level of soil in Guizhou Province by 33%, 96%, 100%, 78%, 96%, and 100%, respectively. Cd, Cu, Pb and Zn are heavily accumulated in dust of living areas with accumulation factors of 4.10, 5.12, 4.12 and 5.51, respectively. City square possesses the highest geometric means of As, Cd, Cu, Pb, and Zn. The risks of heavy metal exposure to teenagers are not obvious and in an order of As>Pb>Cu>Ni>Zn(Cd).
基金financially supported jointly by National Natural Science Foundation of China(Grant No.41175115)the EML of the United States of America
文摘A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artificial nuclides(131I, 137 Cs, and 134Cs) and their global transportation by atmospheric circulation. This paper reports a systematic comparative observation on radioactive concentrations of natural nuclides(7Be and 210Pb) and artificial nuclides(131I, 137 Cs, and 134Cs) at the surface level, measured in weekly continuous aerosol sampling at Mount Guanfeng, Guiyang, China, from March 17, 2011 to April 28, 2011. During this period, the variations in the nuclide concentrations associated with their transport paths were analyzed with 315 hour back-trajectories of air mass initialized 500 m above the surface level at Guiyang. The results show that the pollutants of nuclear leakage from the Fukushima accident were transported to the Guiyang region of China via two significant pathways. In the first pathway the first wave of nuclear pollutants were transported from west to east in air masses at higher altitudes via global atmospheric circulation. The nuclear pollutants encircled the Earth almost once and after about 10 days to two weeks, between March 24 and March 31, 2011, intruded Guiyang from the northwestern region of China. In the second pathway, the nuclear pollutants from the Fukushima region arrived at Guiyang between April 7 and April 14, 2011, via air masses at lower altitudes that moved southwards because of the squeezing of the northeast Asian weather system and then by the influence, in succession, of the northeastern and southeastern air currents in the low-latitude region. The first transport pathway for atmospheric pollutants is on a global scale and based on air masses at higher altitudes, and the second transport pathway is on an eastern Asia regional scale and based on the air masses at lower altitude.
文摘The aim of this study is to shed light on the hydrogeochemical characteristics of karst underground waters at shallow depth in Guiyang City, Guizhou Province with an emphasis on the geochemistry of major elements. Guiyang City bears abundant underground waters and it is also an important representative of the karst areas throughout the world. Ca+{2+} and Mg+{2+} are the dominant cations, accounting for 81%-{99.7%} of the total, and HCO+--3 and SO+{2-}-4 are the dominant anions. Weathering of limestones and dolostones is the most important factor controlling the hydrogeochemistry of underground waters, and weathering of sulfate and evaporite rocks is less important. Moreover, the precipitation and human activities also have a definite influence on the hydrogeochemistry of underground waters in the region studied.
