Distribution characteristics and influencing factors of organophosphorus pesticides in Jianghan plain groundwater
WANG Jian-wei1, ZHANG Cai-xiang1, PAN Zhen-zhen2, LIAO Xiao-ping1, LIU Yuan1, LÜ You1, TANG Mi1
1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geoscience , Wuhan 430074, China; 2. Geography and Tourism College, Chongqing Normal University, Chongqing 400047, China
Abstract：To investigate the distribution characteristics of organophosphorus pesticides (OPPs) in groundwater, 38groundwatersamples on the established monitoring field site with 13monitoring points and 4surface water samples were sampled in June, 2015, in Jianghan plain. According to the determination of some main chemical parameters and OPPs contents, the distribution characteristics and influencing factors of OPPs in Jianghan plain groundwater were studied. Groundwater in this area presents mainly HCO3-Ca×Mg type with strong reducibility. OPPs were ubiquitous in our studied area ranged from 31.5 to 264.5ng/L,with the averageof 86.5ng/L.Three of higher OPPs concentrations were omethoate, methamidophos and diazinon, with the average of 54.3, 32.1 and 27.8ng/L, respectively. Not only single one but the sum of OPPs concentrations were below the MAC standard in “Groundwater Pesticide Residues in Water” (EEC80/778) andthe threshold of drinking water“Hygienic Standard for Drinking Water”(GB 5749-2006) to prove less effect on the local ecological environment. The vertical distribution of OPPs concentration followed as: 50m> 25m> 10m, while the horizontal distributionfollowing:nearby river farm area> farm area> nearby riverarea. The distribution characteristics of OPPs were also influenced by many factors, such as application amount of OPPs、the interaction between the surface water and groundwater、the fluctuation of hydrochemical parameters in groundwater and the biological and non-biological degradation.
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