パージトラップ・メガボアキャピラリーカラム・GC/ FIDによる水中の微量低沸点有機塩素化合物の簡易一斉分析法とその応用

概要

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It has been feared that the contamination of underground water by volatile halocarbon compounds (VHCs) may have spread and become prolonged in the time since it was discovered. A simple method to separate and simultaneously determine trace amounts of VHCs in water has been established and water samples were examined for determining the status of the method. The determination method of VHCs is described hereafter. VHCs were purged from the water sample with high purity helium gas and adsorbed to a collector. The adsorbed VHCs are desorbed by heating to feed to a column 30m long packed with DB-624 0.53mm in diameter cooled at -25℃. Tetrachloroethylene, trichloroethylene, 1,1,1-trichloroethane, trihalomethanes and dichloroethylenes are determined by programmed temperature gas chromatography using a FID. The samples were taken from water supplies in the suburbs of Tokyo and wells near chemical manufacturing plants. This new simple method was applied to the samples. The analytical results indicated that tetrachloroethylene and trichloroethylene were frequently detected in the well water samples near the plants using VHCs, and there were some well waters that were heavily contaminated with the VHCs. The behaviors of those contaminants and their decomposition products (dichloroethylenes) in underground water will have to be further monitored.
順天堂大学の論文