摘要
采集天津市西青区西部中北镇、杨柳青、张家窝、辛口镇等四镇不同功能区表层土壤,以ASE-GPC-SPE联合净化方法对土壤样品进行处理,并通过HPLC-UV-FLU串联检测方法进行测定。结果表明,研究区域土壤16种优控PAHs总量范围67.6～1274.7ng·g-1,平均含量为422.8ng·g-1。四个镇中PAHs总量大小为中北镇>杨柳青>张家窝>辛口镇,四种功能区土壤PAHs平均水平为工厂区>农用地>路边区>生活区,部分采样点存在16种PAHs未完全检出情况。通过主成分分析法揭示了其污染来源,前三个主成分方差贡献率达到91.3%,第一主成分高环PAHs占主导,主要是燃烧源导致。第二主成分低环PAHs占主导,是由石油源导致。同时研究了天津西郊土壤中PAHs与有机质的相关关系,污染浓度不高的情况下PAHs与有机质呈线性正相关R2=0.613,与相关性最强R2=0.665,说明土壤有机质是影响土壤中PAHs含量的重要因素之一。但是如果在高污染源附近,对PAHs的吸附及迁移作用的影响因素较为复杂。通过对比欧洲PAHs风险等级划分标准,中北镇处于中度污染水平,杨柳青镇、张家窝为轻度污染水平,辛口镇无污染。
Polycyclic aromatic hydrocarbons（PAHs） have been identified as serious pollutants in environment.In this paper,the distribution characteristics of sixteen PAHs in surface soils in different functional zones from four towns of Tianjin Xiqing District were investigated.The soil samples were extracted with ASE and then fractioned on GPC and SPE,at last the aromatic fractions were analyzed by HPLC-UV-FLU.The results showed that the total PAHs ranged from 67.6 ng·g-1 to 1 274.7 ng·g-1 with the average value of 422.8 ng·g-1,the concentration or-der of the PAHs in four kinds of utilization soils was：industrial areafarmlandroadsideresidential district.The highest and the lowest aver-age contents of PAHs were found in soils in Zhongbei and Xinkou towns respectively.Not all the 16 PAHs were detected in all 24 samples.Principal component analysis was used to identify the pollution sources of PAHs.The variance contribution rate of top three factors was 91.3%,High-molecular PAHs from burning sources dominated at the first principal component,while,the second principal component mainly at-tributed to the low molecular PAHs from petroleum pollution sources.Correlation of organic compound with PAHs in soils has also been stud-ied：there existed significant linear correlations between soil organic matters and PAHs（R 2 =0.613） and soil organic matters most closely cor-related with chrysen（R 2 =0.665）,indicating that soil organic matter was one of the important factors affecting the PAHs in soil.However,near the serious pollution source of PAHs,the concentration of PAHs in the soils was probably determined by the pollution source and other com-plicated factors of soils.According to European PAHs risk grading standards,Zhongbei town was moderately polluted,Yangliuqing town and Zhangjiawo town were at light pollution level,Xinkou town was unpolluted.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第12期2374-2380,共7页
Journal of Agro-Environment Science
基金
中央级公益性科研院所基本科研业务费专项资金(农业部环境保护科研监测所)资助项目
关键词
土壤
多环芳烃
分布
风险
soil
polycyclic aromatic hydrocarbons
distribution
risk
