六溴环十二烷在土壤中的归趋及植物吸收研究  

The fate of HBCD in soil and its uptake by plants

作　　者：李亚宁[1] 冯秀娟[2] 刘庆余[1] 陈春 李国东[1] 

机构地区：[1]南开大学滨海学院环境科学与工程系,天津300270 [2]清华大学核能与新能源技术研究院,北京100084 [3]农业部环境保护科研监测所农业部产地环境与农产品安全重点开放实验室,天津农业环境与农产品安全重点开放实验室,天津300191

出　　处：《环境污染与防治》2013年第11期5-9,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.21067003);南开大学滨海学院科研启动金项目

摘　　要：在实验室人工控制条件下对典型溴化阻燃剂六溴环十二烷(HBCD)的3种异构体在土壤中的环境行为进行了研究。结果表明,在对照组(无植物种植)与单种组(分别单独种植白菜、萝卜)土壤中总HBCD浓度下降了90%以上,混种组(混合种植白菜与萝卜)土壤中HBCD的浓度下降了50%以上,土壤对HBCD的物理吸附是导致土壤HBCD浓度下降的重要原因。混种组土壤中HBCD的质量浓度约为420μg/kg,远高于单种组,充分说明植物种间竞争会增强HBCD的生物有效性。白菜和萝卜对HBCD的吸收量很小,其中α-HBCD倾向于在白菜和萝卜组织中蓄积,而γ-HBCD则倾向于在土壤中分布。由此可知,土壤吸附会降低HBCD的生物有效性以及人类暴露风险,而植物种间的竞争作用可能使HBCD的环境风险增加。The environmental behaviors of three HBCD diastereomers in soil were studied in the laboratory under manual control. The results indicated that total HBCD concentration in soil of control group （without plant growing） and single planting group （growing cabbage or radish） was decreased by more than 90%, while in intercropping group （growing cabbage and radish）, more than 50 % of initial HBCD addition was decreased. The physically adsorption of HBCD on soils was the key reason of HBCD reduction. The HBCD concentration in soil of intercropping group was about 420 μg/kg, which was much more than that of single planting group, fully showed that the competition of cabbage and radish could enhance the biological effectiveness of HBCD. The HBCD concentrations in plant tissues were low, a-HBCD was the prominent diastereomer in cabbage and radish, whereas γ-HBCD was the highest component in soil. So, it could be concluded that sorption on soil particles could reduce the bioavailability of HBCD and the potential of human exposure. However, plants could increase the exposure risk.

关 键 词：六溴环十二烷 环境归趋 植物吸收 

分 类 号：S154.4[农业科学—土壤学]