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J.Health Sci., 49(1), 1-7, 2003
A Problem in the Determination of Trihalomethane by Headspace-Gas
Chromatography/Mass Spectrometry
Yasuo Takahashi,*, a,
b Sukeo Onodera,c Masatoshi
Morita,d and Yoshiyasu
Teraob
aThe Tokyo Metropolitan Research Laboratory of Public Health, 3-24-1, Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan,
bGraduate School of Nutritional and Environmental Sciences, University of Shizuoka 52-1 Yada, Shizuoka 422-8526, Japan,
cFaculty of Pharmaceutical Science, Science University of Tokyo, 12 Funagawara-machi, Ichigaya, Shinjuku-ku, Tokyo 162-0826, Japan,
and dNational Institute for Environmental Studies, 16-2 Onogawa, Tsukuba-shi, Ibaraki 305-0053, Japan
The formation of trihalomethane (THM) from 37 organohalogen compounds, disinfection by-products, was measured by the headspace-gas chromatography/mass spectrometry (GC/MS) method. Among these 37 organohalogen compounds, 10, including trichloroacetones, trihaloacetonitriles and trihaloacetic acids, produced THMs upon heating of aqueous solutions at 60°C for 30 min in a headspace sampler. The amounts and composition of THMs produced by heating depended on the position and number of the bound chlorine or bromine. In addition, the production of THMs from some of the organohalogen compounds upon heating was strongly affected by pH, temperature and heating duration. These results suggest that the headspace-GC/MS method overestimates the net concentration of THM due to positive errors.
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