土壤中六氯苯的老化特征及其在蚯蚓体内的富集规律  

Hexachlorobenzene:Its aging characteristic in different soils and accumulation in earthworm

作　　者：郜红建[1,2] 蒋新[2] 

机构地区：[1]安徽农业大学资源与环境学院,合肥230036 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,南京210008

出　　处：《应用生态学报》2009年第3期691-695,共5页Chinese Journal of Applied Ecology

基　　金：国家杰出青年基金项目(40325001);土壤与农业可持续发展国家重点实验室开放基金项目(0812000037);安徽省农产品安全重点实验室开放基金项目(LAS200505)资助

摘　　要：采用室内模拟试验,研究了不同土壤中六氯苯的老化特征及其在蚯蚓体内的生物富集规律.结果表明:六氯苯在不同土壤中的老化过程呈现出先快后慢的二阶段特征,即在初始的60d内,六氯苯老化速率较快,随后老化趋势减缓.六氯苯在土壤中的老化作用主要发生在与土壤初始接触的60d内,其老化速率呈现水稻土>红壤>潮土的规律.六氯苯在蚯蚓体内的生物富集量和生物富集系数也随着老化时间的延长而逐渐降低.虽然六氯苯在土壤中的可提取态含量随着老化时间延长而下降,但在蚯蚓体内有较高的生物富集量(457.6～984.3ng·g-1)和一定的生物富集能力(生物富集系数BAF在3.74～6.35),仍会对土壤生态安全构成潜在威胁.A simulation experiment was conducted to study the aging characteristics of hexachlorobenzene （HCB） in different soils and its bioaccumulation in earthworm. The results indicated that the aging of HCB in soils displayed a biphasic characteristic, i. e. , quicker in the first 60 days and slowing down since then. The aging of HCB mainly occurred in the first 60 days during its contact with soil, and its aging rate in soils followed the sequence of paddy soil 〉 red soil 〉 fluvo-aquic soil. The accumulated amount and accumulation rate of HCB in earthworm decreased with increasing aging time. Though the soil extractable HCB decreased with increasing aging time, earthworm still had a higher HCB accumulation （457.6-984. 3 ng· g^-1 ） in its body due to its high HCB accumulation ability （ the bioaccumulation factor BAF was between 3.74 and 6. 35 ） , giving a potential risk to soil ecological safety.

关 键 词：六氯苯 老化特征 土壤性质 蚯蚓 生物富集 

分 类 号：X53[环境科学与工程—环境工程]