| 本文已被：浏览 231次 下载 146次 |
|
|
|
| 长江中游郊野型湖泊鲁湖中有机氯农药污染特征、来源解析与多介质传输规律 |
|
邹妍慜1, 邢新丽1, 李歆1, 余悦1, 刘力2, 张雅2, 张原3, 刘威杰1, 祁士华4
|
|
1.中国地质大学（武汉）环境学院;2.湖北省地质调查院;3.中国地质大学（武汉）生物地质与环境地质国家重点实验室;4.中国地质大学（武汉）环境学院，中国地质大学(武汉)生物地质与环境地质国家重点实验室
|
|
| 摘要: |
| 为探究长江中游典型郊野型湖泊——鲁湖中有机氯农药（OCPs）的赋存特征与传输规律，在鲁湖40个点位采集水样和沉积物样，用气相色谱法（GC-ECD）测定24种OCPs，并开展污染特征、来源和多介质传输规律分析。结果表明，研究区24种OCPs均有检出，水体溶解相、颗粒相和表层沉积物中OCPs总量范围分别为0.64~6.97 ng·L-1、0.06~5.61 ng·L-1、0.47~14.16 ng·g-1 dw，与国内外其他湖泊相比，OCPs含量处于较低水平。水体溶解相以六六六（HCHs）占比最大，颗粒相和沉积物中的主要污染物是HCHs、滴滴涕（DDTs）和艾氏剂。特征比值溯源结果表明，研究区HCHs和DDTs均以历史残留为主，HCHs在水体和沉积物中主要来源分别为农业林丹施用和混合来源，DDTs主要于厌氧环境中发生降解。采用余弦相似度、分配系数和逸度法进行OCPs多介质传输分析，溶解相-颗粒相间的分配系数（Kd）表明水体中OCPs随辛醇-水分配系数（KOW）升高而更易被悬浮颗粒物吸附，水体-沉积物间的逸度分数（ffSW）随KOW的增加而减小，表明研究区沉积物是HCB、艾氏剂等高KOW OCPs的汇。 |
| 关键词: 有机氯农药 多相分布 来源解析 多介质传输 |
| DOI： |
| 分类号: |
| 基金项目:长江生态环境保护修复联合研究（二期），中国地质大学（武汉）中央高校基金 |
|
| Pollution characteristics, source diagnose and multi-medium transmission laws of organochlorine pesticides in Luhu Lake, a suburban lake in the middle reaches of the Yangtze River |
|
Zou Yanmin,Xing Xinli,Li Xin,Yu Yue,Liu Li,Zhang Ya,Zhang Yuan,Liu Weijie,Qi Shihua
|
|
1.China University of Geosciences (Wuhan);2.School of Environmental Studies, China University of Geosciences (Wuhan)
|
| Abstract: |
| In order to investigate the occurrence characteristics and transmission laws of organochlorine pesticides (OCPs) in Luhu Lake, a typical suburban lake in the middle reaches of the Yangtze River, water and sediment samples were collected from 40 sites in Luhu Lake, located in Jiangxia District, Wuhan, China. 24 kinds of OCPs were determined by gas chromatography (GC-ECD) to analyze the pollution characteristics, sources and multi-medium transmission laws. The results showed that, all 24 kinds of OCPs were detected in the study area, and the total amounts of OCPs ranged 0.64 to 6.97 ng·L-1 in dissolved phase, 0.06 to 5.61 ng·L-1 in suspended particulate matter, 0.47 to 14.16 ng·g-1 in surface sediments, respectively. Compared with other lakes, the OCPs concentrations were at a low level. HCHs accounted for the largest proportion in dissolved phase, while HCHs, DDTs and Aldrin were the main pollutants in suspended particulate matter and sediment. The results of characteristic ratio traceability analysis showed that HCHs and DDTs were mainly historical residues in the study area. The main sources of HCHs in water and sediment were agrolindane application and mixed sources respectively, and DDTs were mainly degraded in an anaerobic environment. The multi-medium transmission of OCPs was analyzed by the cosine theta similarity metric, partition coefficient and fugacity approach. The distribution coefficient (Kd) between dissolved phase and suspended particulate matter showed that OCPs in water were more easily to be adsorbed by suspended particulate matter with an increase in the octanol-water partition coefficient (KOW). The fugacity fraction between water and sediment (ffSW) decreased with an increase in KOW, indicating that the sediments in the study area were sinks of OCPs with high KOW such as HCB and Aldrin. |
| Key words: organochlorine pesticides polyphase distribution source apportionment multi-medium transport |
