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多氯联苯在水稻田中的迁移行为
引用本文:毕新慧,储少岗,徐晓白.多氯联苯在水稻田中的迁移行为[J].环境科学学报,2001,21(4):454-458.
作者姓名:毕新慧  储少岗  徐晓白
作者单位:中国科学院生态环境研究中心,
基金项目:国家自然科学基金项目,中科院生态中心创新工程项目 (NSFCNo.2 9837180和RCEES 990 2 )
摘    要:对典型污染地区水稻田土壤及作物中多氯联苯的含量和分布特征进行了研究。结果表明,土壤中以4-6氯取代的PCBs同类物(congeners)为主,三者占PCBs总量的85%以上;多氯联苯在土壤中的横向和纵向迁移行为很弱,同类物之间表现出不同的迁移特性;水稻对多氯联苯没有明显的生物富集作用;水稻不同组织中多氯联苯的含量相差很大,其中浓度分布顺序为稻叶>稻壳>稻杆>糙米;大气沉降可能是水稻污染的主要来源。

关 键 词:多氯联苯  水稻  土壤  迁移转化  环境毒理学  污染
文章编号:0253-2468(2001)-04-0454-05
收稿时间:2000/7/25 0:00:00
修稿时间:2000年7月25日

Transport of PCBs in contaminated paddy fields
BI Xinhui,CHU Shaogang and XU Xiaobai.Transport of PCBs in contaminated paddy fields[J].Acta Scientiae Circumstantiae,2001,21(4):454-458.
Authors:BI Xinhui  CHU Shaogang and XU Xiaobai
Institution:Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085,Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085 and Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085
Abstract:PCBs transport in paddy field was investigated. The soil and rice samples were analyzed for PCBs contamination. Tetra to hexa chlorinated polychlorinated biphenyl were dominant in soil samples from paddy field. These three homolog groups accounted for >85% of PCBs in the soil samples. The distribution of PCBs in different depths of soil showed that high chlorinated PCB congeners barely migrate to deeper layer through pore water. It was showed that rice grown in the field appeared somewhat contamination by PCBs, but it was not likely subjected to significant bioconcentration of PCBs from contaminated soil directly. The PCB concentrations in the different tissues were different from each other. The maximum concentration was observed in leaves. The volatilization of PCBs from soil and subsequent adsorption onto the plant was suggested to be the predominant mechanism of PCBs contamination.
Keywords:PCBs  rice  soil  transport
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