某市岩溶地下水四氯化碳污染动态演化及分析

根据某市南郊岩溶地下水水源地2000年受到四氯化碳污染的监测资料,分析了污染羽动态特征,指出距污染源农药厂较近的农药厂井中四氯化碳浓度为各区最高,是南区污染重心,北区果园井污染较中间过渡区严重,成为北区的污染重心,污染羽呈"哑铃型"。经治理,各监测点四氯化碳浓度均呈下降趋势,至2005年4月污染已基本消失。通过此过程,分析研究区四氯化碳浓度随时空变化的控制因素。结果表明,该市地下水四氯化碳污染动态变化主要受污染源输入、降雨、人工开采等因素的影响。

Dynamic evolution and analysis of carbon tetrachloride pollution in karst groundwater in a city

Based on the monitoring data of carbon tetrachloride pollution occurring at the groundwater source zone of a southern suburb area of a city in 2000,the dynamic characteristics of a contaminant plume were analyzed.It is pointed out that the concentration of carbon tetrachloride(CT) in the well of a pesticide manufacturer was the highest in the study area,which was the pollution center in the south.The CT concentration in the well of a north orchard was much higher than in the wells in the middle,which was another pollution center.Therefore,the contamination plume is shaped like a dumbbell.The CT concentration in all the wells was reduced through pollution regulation,and the pollution nearly disappeared in April of 2005.The control factors that influenced the variation of CT concentration with space and time were analyzed in the study area.It was demonstrated that the dynamic variation of CT concentration was mainly influenced by contaminant input,rainfall,and groundwater exploitation.