[ Objective] The study aimed to discuss air pollution by fluoride in spring and winter of Baoding City. [Method] Using fluor reagent spec- trophotometry, fluoride concentration in the atmosphere in spring and winter o...[ Objective] The study aimed to discuss air pollution by fluoride in spring and winter of Baoding City. [Method] Using fluor reagent spec- trophotometry, fluoride concentration in the atmosphere in spring and winter of Baoding City was detection, and its air pollution by fluoride was assessed. [ Result ] In winter, atmospheric fluoride concentration in Baoding City was 0.009 -0.052μg/L, and the average detected rate of atmospheric fluoride concentration in the campus of Hebei University was 80%, In spring, atmospheric fluoride concentration was 0. 018 -0. 059 μg/L, and the detected rate was 94%. Compared with winter, air ＇pollution by fluoride was more serious in spring. During a day, the peaks of fluoride concentration in the atmosphere appeared from 10：00 to 11：00 or at 14：00. A rain could reduce fluoride concentration in the atmosphere and make the air clean. [Condusion] The research could provide scientific references for the effective control of air pollution by fluoride in Baoding City.展开更多
Atmospheric emissions of fluoride from an aiuminium smelter-alumina refinery located on the northern coast of Galicia, NW Spain, increase the content of fluorine in soils and vegetation in the vicinity of the complex....Atmospheric emissions of fluoride from an aiuminium smelter-alumina refinery located on the northern coast of Galicia, NW Spain, increase the content of fluorine in soils and vegetation in the vicinity of the complex. The effects of the addition of fluoride solutions on the chemical properties of soil samples from the area surrounding the complex were investigated in laboratory experiments. Addition of fluoride to soils resulted in increases in pH and concentrations of Fe, A1, and organic matter in the equilibrium solutions and decreases in concentrations of Ca, Mg, and K. No consistent effects were observed on the Cu, Mn, or Zn concentrations. Most of the A1 in solution was bound to organic matter. Within the fraction ＂labile aluminium＇, the concentration of A1-OH complexes decreased and the A1-F complexes increased, especially A1F3 and A1F4^-, which are less toxic than Al^3＋ and A1-OH species.展开更多
文摘[ Objective] The study aimed to discuss air pollution by fluoride in spring and winter of Baoding City. [Method] Using fluor reagent spec- trophotometry, fluoride concentration in the atmosphere in spring and winter of Baoding City was detection, and its air pollution by fluoride was assessed. [ Result ] In winter, atmospheric fluoride concentration in Baoding City was 0.009 -0.052μg/L, and the average detected rate of atmospheric fluoride concentration in the campus of Hebei University was 80%, In spring, atmospheric fluoride concentration was 0. 018 -0. 059 μg/L, and the detected rate was 94%. Compared with winter, air ＇pollution by fluoride was more serious in spring. During a day, the peaks of fluoride concentration in the atmosphere appeared from 10：00 to 11：00 or at 14：00. A rain could reduce fluoride concentration in the atmosphere and make the air clean. [Condusion] The research could provide scientific references for the effective control of air pollution by fluoride in Baoding City.
基金supported by the National Programme for Research and Development, Spanish Ministry of Science (No.AMB97-1062).
文摘Atmospheric emissions of fluoride from an aiuminium smelter-alumina refinery located on the northern coast of Galicia, NW Spain, increase the content of fluorine in soils and vegetation in the vicinity of the complex. The effects of the addition of fluoride solutions on the chemical properties of soil samples from the area surrounding the complex were investigated in laboratory experiments. Addition of fluoride to soils resulted in increases in pH and concentrations of Fe, A1, and organic matter in the equilibrium solutions and decreases in concentrations of Ca, Mg, and K. No consistent effects were observed on the Cu, Mn, or Zn concentrations. Most of the A1 in solution was bound to organic matter. Within the fraction ＂labile aluminium＇, the concentration of A1-OH complexes decreased and the A1-F complexes increased, especially A1F3 and A1F4^-, which are less toxic than Al^3＋ and A1-OH species.
