Affiliations: Department of Environmental Resources Engineering,
Diwan College of Management, No. 87-1, Nansh Li, Madou, Tainan, Taiwan,
China | Department of Mineral and Petroleum
Engineering, "National" Cheng Kung University, Tainan, Taiwan, China
Abstract: 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-11) 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 theproblems of contamination,
preservation and quantitative analysis of natural water.
