惠州农业土壤中有机氯农药残留的剖面分布特征  

Vertical distribution of organochlorine pesticide residue along soil profile in agricultural soils of Huizhou

作　　者：谭镇[1] 李传红[1] 俞林伟[2] 谢贻发[3] 雷泽湘[4] 

机构地区：[1]广东省惠州市环境科学研究所,惠州516001 [2]温州医学院,温州325000 [3]暨南大学水生生物研究所,广州510632 [4]仲恺农业技术学院,广州510225

出　　处：《中国生态农业学报》2008年第5期1134-1137,共4页Chinese Journal of Eco-Agriculture

基　　金：广东省科技攻关项目(2002c31609);广东省自然科学基金(06025915)资助

摘　　要：对惠州市6个样点的农业土壤剖面样品的17种有机氯农药残留量进行了测定,探讨了土壤剖面有机氯农药的残留现状和分布特征。结果表明,有机氯农药的检出率为100%,含量范围0.25-64.16μg.kg^-1。有机氯农药残留总量沿土壤剖面总的垂直变化趋势为随深度增加而下降。各组分在不同土壤深度具体变化特征因受多种因素影响而有所不同,HCHs峰值多出现在土壤亚表层,含量随深度变化幅度不大;DDTs在土壤深层的残留量远低于表层。从HCHs和DDTs的异构组成来看,DDTs残留主要是过去施用的残留物,HCHs可能与土壤新的林丹输入有关,需要进一步加强监管力度。17 kinds of organochlorine pesticides（OCPs） in 6 agricultural soil profiles of Huizhou City were detected.The residues and distribution of OCPs in the soil were discussed.Results show that OCPs are found in all the samples and the range of OCPs content is 0.25~64.16 μg·kg-1.The content of OCPs decreases with soil depth and the vertical changes of all chemicals of OCPs are different due to various factors.HCHs residues shows low variation alonge the profiles and their highest concentrations are usually found in the subsoil（5~20 cm）in most sample sites.The topsoil contains much more DDTs than the bottom layes of soil.The ration of α-HCH/γ-HCH and DDT/（DDE＋DDD）indicates that most of DDTs residues are from historic utilization,while recent Lindane into the environment might be correlated with HCHs,whose control should be enforced.

关 键 词：土壤 有机氯农药 HCHS DDTS 残留量 剖面分布 惠州 

分 类 号：X53[环境科学与工程—环境工程]