農業(yè)中廣泛使用的殺蟲劑和肥料,，工礦企業(yè)中的廢棄物排放、生活污水等成為水體中污染物的主要來源,。有機氯農藥是在各種環(huán)境介質中廣泛存在的殺蟲劑,，具有持久性、高脂溶性和致癌性,，對生態(tài)系統(tǒng)和人類健康具有重要影響,。城市內封閉性湖泊由于缺乏水體交換，流動性差,，自凈能力不足,，分析和評估有機氯農藥在城市內湖中的分布規(guī)律，進行風險評估具有重要的意義,。
中科院武漢植物園污染生態(tài)學科組副研究員楊玉義博士在王俊研究員的指導下,，以中國最大的城市內湖東湖為例，研究其有機氯農藥在東湖中的分布規(guī)律和生態(tài)健康風險,。經過測定108個表層水體樣品發(fā)現有機氯農藥含量在未檢出到120 ngL-1之間,，其中含量最高的單體為δ-六六六，七氯和α-六六六,。滴滴涕和六六六的含量的平均值分別為7.40和5.70 ngL-1,。在東湖的五個子湖中，后湖的滴滴涕,、六六六和總的有機氯農藥含量最高,。經過分析發(fā)現，林丹和技術性六六六的使用是水體中六六六的主要來源,?；谖锓N敏感性的生態(tài)風險評估發(fā)現，水體中的有機氯農藥對東湖水生生物具有輕微的影響,。對于人類的致癌風險和非致癌危險系數的評估表明,，東湖水體已經不適合作為飲用水源。該研究成果為城市內湖的管理和污染治理提供了重要參考,。
本項目獲得中國科學學院“百人計劃”專項資助,，相關研究結果在環(huán)境領域期刊Environmental Science and Pollution Research上發(fā)表。（生物谷Bioon.com）
生物谷推薦的英文摘要
Environmental Science and Pollution Research doi：10.1007/s11356-013-2269-6
Concentrations,， distributions,， sources， and risk assessment of organochlorine pesticides in surface water of the East Lake,， China
Yuyi Yang,， Xiaoyan Yun， Minxia Liu,， Ying Jiang,， Qing X. Li， Jun Wang
East Lake resides in the urban area of Wuhan City and is the largest urban lake in China. The concentrations of 16 organochlorine pesticides (OCPs) were analyzed in 108 surface water samples collected from the East Lake. The total concentrations of OCPs ranged from not detected to 120 ng L1 with predominance of δ-HCH， heptachlor,， and α-HCH. The mean values of HCHs and DDTs were 7.40 and 5.70 ng L1,， respectively， accounting for 40 and 31 % of the total OCPs. For the five lakelets in East Lake,， Houhu Lake exhibited the highest concentrations of HCHs,， DDTs， and total OCPs,， which has been used actively for fisheries and surrounded by suburban rural areas and farmlands. Historical lindane or technical HCH input was probably the source of HCH,， while technical DDTs might be the source of DDT in the East Lake. The ratio between heptachlor and its metabolic products indicated recent input of heptachlor. Although the combining ecological risks for all aquatic species in the East Lake calculated by species sensitivity distribution reached approximately 105， the OCPs in the East Lake had slight effects on aquatic organisms. The carcinogenic risks and non-carcinogenic hazard indices of DDTs and HCHs indicated that water in the East Lake was not suitable as water sources for human. However,， the results indicated the water quality was safe for people to swim in the urban lake.
