| DDTs在海河干流市区段沉积物/水间迁移行为研究 |
| 摘要点击 2445 全文点击 1486 投稿时间：2008-08-31 修订日期：2008-12-04 |
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| 中文关键词 DDTs 海河干流 逸度模型 沉积物 表层水 |
| 英文关键词 DDTs mainstream of Haihe River fugacity model sediment surface water |
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| 中文摘要 |
| 于2007年8月～2008年3月对海河干流表层水和沉积物中滴滴涕（DDTs）污染状况进行了采样调查.结果表明，海河干流水体DDTs含量为6.88～78.82 ng/L（均值28.54 ng/L），表层沉积物中DDTs含量为5.82～45.5 ng/g（均值21.55 ng/g），表层水和表层沉积物中DDTs主要成分分别为p,p′-DDT和p,p′-DDE.利用稳态非平衡逸度模型计算了p,p′-DDT在海河干流沉积物/水间迁移和分布，模型结果用现场实测浓度进行验证，计算值与实测值吻合很好.模型参数灵敏度分析进一步表明，生物降解速率常数、污染物在悬浮颗粒物/水间分配系数以及水体颗粒物沉降通量是影响p,p′-DDT在沉积物/水间迁移过程的主要因素. |
| 英文摘要 |
| DDTs concentrations in surface water and sediment were measured from August 2007 to March 2008 in the mainstream of Haihe River. The results showed that DDTs concentrations ranged from 6.88-78.82 ng/L (mean 28.54 ng/L) in surface water, 5.82-45.5 ng/g (mean 21.55 ng/g) in sediment. The dominant DDTs form in surface water and sediment was found to be p,p′-DDT and p,p′-DDE, respectively. A steady state fugacity model (sediment-water exchange model) was established and successfully applied to the field data for p,p′-DDT in Haihe River. The parameter sensitivity analysis showed that sediment-water exchange of p,p′-DDT was mainly influenced by biodegradation rate constant, suspended particle-water partition coefficient and particle settling flux. |
