上海农村及郊区土壤中PCBs污染特征及来源研究
Characteristics and Source of Polychlorinated Biphenyls in Agricultural Soil of Shanghai, China
查看参考文献16篇
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文摘
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2007年3月采集上海市农村及郊区36个表层土壤样品, 采用气相色谱法对土壤中的多氯联苯(PCBs)残留进行了分析, 揭示了土壤中PCBs的残留水平、分布、组成特征及来源. 结果表明, 试区土壤中共检出62种PCB, 总浓度最高2 530 ng·kg~(-1), 最低 71.7 ng·kg~(-1), 平均含量534 ng·kg~(-1). 较高污染浓度主要是编号为BS2、SJ6、JS4和FX4的土壤样品, 但从整体采样区域来看, 其污染可能主要来源于城区污染导致的区域大气沉降或是全球大气传输所致. 上海农村及郊区土壤PCBs污染物以Tri-CBs和Tetra-CBs为主, 主要以工业Aroclor1242来源为主. 相关性分析显示, 土壤中PCBs与TOC具有显著相关性, 尤其是对于挥发性较强的低氯代 PCBs, 表明TOC是影响上海市土壤中PCBs持留的重要因素之一. 聚类分析显示, 部分采样点PCBs污染与工业品使用有关, 但可能还存在其他来源 |
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其他语种文摘
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A new random sampling strategy was adopted to examine the PCBs in the agricultural lands nearby Shanghai and a total of 36 surface soil samples were collected from rice, bean, cotton and vegetable soils in the October of 2007.The concentrations of 144 polychlorinated biphenyls(PCBs)in the soil samples were determined by using gas chromatography equipped with 63Ni micro-electron capture detector (GC-μECD).On basis of the analytical data of 62 PCB congeners,it was certified that the total concentrations of identified PCBs ranged from 71.7 to 2 530 ng·kg~(-1) with means of 534 ng·kg~(-1). According to the compositional profiles of soil PCBs homologues, the higher proportions of low chlorinated(Tri-CBs and Tetra-CBs)were observed. The results indicated that PCB15+13,PCB22,PCB66,PCB44 and PCB153 were the most dominant congeners among the identified PCBs with regard to the concentrations and detection frequencies. The high levels of PCBs were detected in soil samples taken from the agricultural field BS2,SJ6,JS4 and FX4, respectively. PCBs homologues analysis revealed that PCBs in the study areas might be originated from Aroclor1242.The correlation analysis showed that there was a relatively good correlation among the individual PCBs and soil TOC, suggesting the important influence of soil TOC on PCBs contamination |
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来源
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农业环境科学学报
,2010,29(5):899-903 【核心库】
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关键词
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土壤
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PCBs
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污染特征
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来源
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地址
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1.
兰州交通大学环境与市政工程学院, 兰州, 730070
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上海大学环境与化学工程学院, 上海, 200444
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上海大学环境与化学工程学院, 有机地球化学国家重点实验室, 上海, 200444
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-2043 |
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学科
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环境质量评价与环境监测 |
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基金
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国家自然科学基金重点项目
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国家科技支撑计划项目
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文献收藏号
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CSCD:3946498
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