摘要：Round robin study was carried out to investigate the precision of the determinations of trihalomethanes in water by the solvent-extraction gas chromatographic (GC) method and the head-space GC method which are prescribed by the Japanese Ministry of Health and Welfare. Four samples of water with chloroform, bromodichloromethane, dibromochloromethane and bromoform were analyzed by 14 different laboratories : 13 laboratories measured the concentrations of the four compounds by the solvent-extraction GC method and 12 laboratories, by the head-space GC method. The results show that the intralaboratory precision was better than the interlaboratory precision by analysis of variance ; the precision of the results by the solvent-extraction GC method was better than those by the head-space GC method in many cases. The mean obtained by the head-space GC method was significantly larger than that obtained by the solventextraction GC method in some cases.
关键词：round robin study;trihalomethane;water;solventextraction GC method;head-space GC method;precision;variance analysis
