潜水含水层受工农业污染影响明显，对潜水地下水进行水质监测是生态环境监测的重要内容。以往大多利用浅井进行水质采样，但城市化及农村饮用水改造使其数量急剧减少，已不能满足区域调查的要求，现场挖坑采样成为主要方式。本文利用常规浅井与现场挖坑采样两种方式，对有机污染组份的检测结果进行对比分析。结果表明：两种方式均能反映潜水含水层水质状况及动态变化规律，但受采样点环境条件影响，现场挖坑采样方式更具针对性和可靠性。% The phreatic aquifer of Shanghai is pol uted by organic compounds from industry and agriculture. Consequently, it is essential to monitor the water quality of the aquifer to minimize ecological damage. In the past, phreatic wel s have been sampled frequently to test water quality. However, the quantity of accessible wel s has decreased rapidly as a result of urbanization and transformation of the rural drinking water system. We compared two methods for sampling the aquifer to test for organic compounds—traditional phreatic wel s and in situ caves. The results showed that both sampling methods were suitable for characterizing water quality conditions and dynamic variation within the aquifer. However, in situ caves provide more pertinent and reliable results, as the samples were less affected by environmental conditions around the sampling site.
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