Abstract：
Distributions, souces, ecological risks as well as environmental behaviors of 20 organochlorine pesticides (OCPs) in riparian soils and sediments of the middle reach of the Huaihe River, a traditional agricultural area of China, were investigated. ∑OCPs in riparian soils and sediments were 1.8-63 ng g-1 (mean = 19 ± 12 ng g-1) and 1.2-9.9 ng g-1 (mean = 3.0 ± 1.8 ng g-1), respectively. HCHs were the dominant OCPs in both soils and sediments, while high concentrations of ∑HEPTs and ∑DDTs were also detected in some soils and sediments. No correlations were found between concentrations of OCPs and organic matter contents in both soils and sediments. Based on the source analysis, most OCPs in the riparian soils were mainly from historical residues, such as historical usage of technical HCH, DDT, chlordane and endosulfan. OCPs in sediments were influenced not only by surface runoff by also by other factors, e.g. in-situ contamination (DDT-containing antifouling paints in ships) and/or hydraulic transport from some tributaries. Some never-used OCPs, such as heptachlor and aldrin, were widely detected in soils and sediments. This might be attributed to some unknown usages or long-range atmospheric transport of them from other source regions. Ecological risk analysis suggested that DDTs and HCHs in soils would not lead to an adverse effect on soil ecological environment as well as agricultural production, and OCP residues in sediments also would not pose a threat to the sediment-dwelling organisms.
摘要：
Distributions,南方，淮河中游河岸土壤和沉积物中20种有机氯农药（OCPs）的生态风险和环境行为，中国传统的农业区，被调查了。河岸土壤和沉积物中的∑OCPs为1.8-63ngg-1（平均值=19±12ngg-1）和1.2-9.9ngg-1（平均值=3.0±1.8ngg-1），分别。六氯环己烷是土壤和沉积物中的主要OCPs，同时在一些土壤和沉积物中也检测到高浓度的∑HEPT和∑DDT。在土壤和沉积物中的OCPs浓度与有机质含量之间均未发现相关性。根据来源分析，河岸土壤中的大多数OCPs主要来自历史残留物，例如技术六氯环己烷的历史使用情况，滴滴涕,氯丹和硫丹。沉积物中的OCPs不仅受到地表径流的影响，还受到其他因素的影响，例如，原位污染（船舶中含有滴滴涕的防污涂料）和/或某些支流的水力运输。一些从未使用过的OCPs，如七氯和艾氏剂，在土壤和沉积物中广泛检测到。这可能归因于一些未知的用途或它们从其他源区的远距离大气传输。生态风险分析表明，土壤中的DDTs和HCHs不会对土壤生态环境和农业生产造成不利影响。沉积物中的OCP残留物也不会对沉积物中的生物构成威胁。
