摘要
在１９９０—１９９３年期间，研究了历史上曾被ＨＣＨ严重污染的鸭儿湖地区的水生态系统和陆生生态系统中ＨＣＨ的残留动态与归宿，获得了ＨＣＨ在各种不同环境条件下的残留动态方程与环境半衰期．结果表明：鸭儿湖底泥是ＨＣＨ长期残留的主要归宿。尽管ＨＣＨ已禁用十几年，目前该地区环境中ＨＣＨ的残留已降至亚ｎｇ／ｇ级水平，然而它在淡水食物链中仍然存在很高的生物积累．残留的ＨＣＨ在各种环境中的分布和转移均与该地区有机质含量呈正相关。目前环境中ＨＣＨ残留的主要异构体是β-ＨＣＨ。同时各种环境中ＨＣＨ的残留动态可用指数方程来表示，其半衰期在四种不同环境中的顺序为：水＜土壤＜稻田泥＜底泥。
A study on dynamics and long-term fate of residual hexachlorocyclohexane(HCH)in aquatic and terrestrial environments in Ya-Er Lake Area,heavily pollutedby HCH historically, was carried out during the period from 1990-1993. Theconcentration Kinetics and half-lived bine of HCH-residues in four differentenvironments were obtained. The results show that sediment is the primaryaccumulation site for the long-term fate of HCH--residues. Despite HCH was bannedfor more than ten years in Ya-Er Lake Area,the bioaccumulation of HCH-residue infreshwater food chain was still high (BCF=104 in fish liver). The distribution andmobility of HCH-residues are correlated with the organic matter positively. TheHCH-residue in the current environmentin that area is mainlyβ-HCH. Meanwhile, aseries of model exponential equations are used for describing dynamics ofHCH-residues. From these equations, the half-lived time calculated and the order infour different environments are:water < soil < mud of paddy field < sediment.
出处
《水生生物学报》
CAS
CSCD
北大核心
1999年第4期337-345,共9页
Acta Hydrobiologica Sinica
基金
德国VW科学基金
淡水生态与生物技术国家重点实验室基金
