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Envir Sci Pollut R:武汉东湖水体中有机氯农药分布规律

  1. 分布规律
  2. 有机氯农药

来源:中科院武汉植物园 2013-11-04 15:18

农业中广泛使用的杀虫剂和肥料,工矿企业中的废弃物排放、生活污水等成为水体中污染物的主要来源。有机氯农药是在各种环境介质中广泛存在的杀虫剂,具有持久性、高脂溶性和致癌性,对生态系统和人类健康具有重要影响。城市内封闭性湖泊由于缺乏水体交换,流动性差,自净能力不足,分析和评估有机氯农药在城市内湖中的分布规律,进行风险评估具有重要的意义。

农业中广泛使用的杀虫剂和肥料,工矿企业中的废弃物排放、生活污水等成为水体中污染物的主要来源。有机氯农药是在各种环境介质中广泛存在的杀虫剂,具有持久性、高脂溶性和致癌性,对生态系统和人类健康具有重要影响。城市内封闭性湖泊由于缺乏水体交换,流动性差,自净能力不足,分析和评估有机氯农药在城市内湖中的分布规律,进行风险评估具有重要的意义。

中科院武汉植物园污染生态学科组副研究员杨玉义博士在王俊研究员的指导下,以中国最大的城市内湖东湖为例,研究其有机氯农药在东湖中的分布规律和生态健康风险。经过测定108个表层水体样品发现有机氯农药含量在未检出到120 ngL-1之间,其中含量最高的单体为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别为7.40和5.70 ngL-1。在东湖的五个子湖中,后湖的滴滴涕、六六六和总的有机氯农药含量最高。经过分析发现,林丹和技术性六六六的使用是水体中六六六的主要来源。基于物种敏感性的生态风险评估发现,水体中的有机氯农药对东湖水生生物具有轻微的影响。对于人类的致癌风险和非致癌危险系数的评估表明,东湖水体已经不适合作为饮用水源。该研究成果为城市内湖的管理和污染治理提供了重要参考。

本项目获得中国科学学院“百人计划”专项资助,相关研究结果在环境领域期刊Environmental Science and Pollution Research上发表。(生物谷Bioon.com)

生物谷推荐的英文摘要

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.

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