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A new design of groundwater sampling device and its application

机译:一种新型的地下水采样装置及其应用

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Compounds in the atmosphere contaminate samples of groundwater. An inexpensive and simple method for collecting groundwater samples is developed to prevent contamination when the background concentration of contaminants is high. This new design of groundwater sampling device involves a glass sampling bottle with a Teflon-lined valve at each end. A cleaned and dried sampling bottle was connected to a low flow-rate peristaltic pump with Teflon tubing and was filled with water. No headspace volume was remained in the sampling bottle. The sample bottle was then packed in a PVC bag to prevent the target component from infiltrating into the water sample through the valves. In this study, groundwater was sampled at six wells using both the conventional method and the improved method. The analysis of trichlorofluoromethane(CFC-ll) concentrations at these six wells indicates that all the groundwater samples obtained by the conventional sampling method were contaminated by CFC-11 from the atmosphere. The improved sampling method greatly eliminated the problems of contamination, preservation and quantitative analysis of natural water.
机译:大气中的化合物会污染地下水样品。开发了一种廉价且简单的收集地下水样品的方法,以在污染物的背景浓度很高时防止污染。这种新的地下水采样设备设计包括一个玻璃采样瓶,每个采样瓶的两端都有一个带特氟龙衬里的阀门。将清洁和干燥的采样瓶连接到带有特氟龙管的低流量蠕动泵,并装满水。样品瓶中没有剩余的顶空体积。然后将样品瓶包装在PVC袋中,以防止目标成分通过阀门渗入水样品中。在这项研究中,使用常规方法和改进方法在六个井中对地下水进行了采样。对这六个井中三氯氟甲烷(CFC-11)浓度的分析表明,通过常规采样方法获得的所有地下水样品均被大气中的CFC-11污染。改进的采样方法极大地消除了天然水的污染,保存和定量分析的问题。

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