水溶性有机物对土壤中菲的生态毒性影响  

Influence of Dissolved Organic Matter on the Eco-toxicity of Phenanthrene in a Soil

作　　者：占新华[1] 万寅婧[1] 周立祥[1] 

机构地区：[1]南京农业大学资源与环境学院,南京210095

出　　处：《环境科学》2004年第3期120-124,共5页Environmental Science

基　　金：国家自然科学基金资助项目 ( 2 0 0 0 70 0 1;3 0 170 5 3 7;2 0 3 770 2 4)

摘　　要：采用生物培养和物理化学试验 ,研究了水溶性有机物 (DOM )对土壤中phe生态毒性的影响 .结果表明 ,本研究所用DOM均具有表面活性 ;小麦根 phe毒害的敏感区间为 0～ 2 0 0mg/kg ,2 0 0mg/kg是土壤中phe的 5 0 %小麦根伸长抑制率浓度 .DOM的存在会降低phe的生态毒性 ,但是降低程度与其疏水性馏分含量和表面活性有关 ,且 phe生态毒性的降低程度随DOM浓度的增大而增大 .本研究的结果说明DOM能减轻土壤中 phe的生态毒性 .Biological and physico-chemistry experiments were conducted to study the effects of dissolved organic matter(DOM) on eco-toxicity of phenanthrene in a soil. The results showed that DOM was a kind of surfactant. The sensitive range of phe inhibiting wheat root elongation was from 0 to 200mg/kg, and median inhibition concentration (IC 50) was 200mg/kg. In the presence of DOM, the eco-toxicity of phe could be alleviated and the inhabited degree was related to the content of hydrophobic components and surface activity. This effect could be strengthened by the high concentration of DOM. As a kind of hydrophobic organic compound, phe could reduce the moisture of topsoil, and DOM would slightly increase the moisture of topsoil polluted by phe. It was concluded that DOM could lighten the eco-toxicity of phe in soil.

关 键 词：菲 水溶性有机物 根伸长抑制率 发芽指数 生态毒性 

分 类 号：X53[环境科学与工程—环境工程] R124[医药卫生—环境卫生学]