| 硫酸盐还原条件下多环芳烃在土壤中的迁移转化 |
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| 引用本文： | 谭文捷,丁爱中,王金生.硫酸盐还原条件下多环芳烃在土壤中的迁移转化[J].环境科学研究,2009,22(2). |
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| 作者姓名： | 谭文捷 丁爱中 王金生 |
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| 作者单位： | 北京师范大学,水科学研究院,教育部水沙科学重点实验室,北京,100875 |
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| 摘 要： | 为研究硫酸盐还原条件下多环芳烃(Polycyclic Aromatic Hydrocarbons,PAHs)类有机污染物在土壤中的污染分布规律和迁移转化过程,设计了室内土柱淋溶试验,选择菲、蒽和芘作为PAHs的代表,模拟硫酸盐还原条件下PAHs在土壤中的迁移转化过程.监测土壤中PAHs的垂直分布、淋出液中ρ(PAHs)和ρ(SO42-)、淋出液的氧化还原电位(Eh)和总体积,并通过质量平衡计算出PAHs的降解率.结果表明:①菲和蒽的相对淋出率总体都不超过2%.120 d后菲和蒽在土壤中的残留率分别为51.87%和51.21%,而芘有90%以上吸附在土壤中,在淋出液中未检出.②随着淋溶时间的延长,土壤中的氧气逐渐被消耗,淋出液中ρ(SO42-)和Eh逐渐降低,并趋于稳定,硫酸盐还原作用发生.③3种PAHs在硫酸盐还原条件下都存在一定程度的降解.菲和蒽的降解率相差不大且随淋溶时间的延长逐渐增大,120 d后菲和蒽的降解率分别为47.41%和48.10%,而4环的芘降解速率非常低,120 d后降解率仅为3.61%.
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| 关 键 词： | 多环芳烃 硫酸盐还原 生物降解 |
Transportation of PAHs in Soil under Sulfate-Reducing Conditions |
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| TAN Wen-jie,DING Ai-zhong,WANG Jin-sheng.Transportation of PAHs in Soil under Sulfate-Reducing Conditions[J].Research of Environmental Sciences,2009,22(2). |
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| Authors: | TAN Wen-jie DING Ai-zhong WANG Jin-sheng |
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| Institution: | TAN Wen-jie,DING Ai-zhong,WANG Jin-shengKey Laboratory of Water , Sediment Sciences of Ministry of Education,College of Water Sciences,Beijing Normal University,Beijing 100875,China |
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| Abstract: | The distribution and transportation of polycyclic aromatic hydrocarbon(PAH) contamination in soil under sulfate-reducing conditions were studied through column experimentation.Phenanthrene,anthracene and pyrene were selected as representative PAHs,and their vertical distributions in the soil column,their mass concentrations,and sulfate radical ion and E_h values in leaching solution were detected under simulated sulfate-reducing conditions.Also,the mass balance of PAHs was analyzed to calculate the biodegra... |
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