Determination of Halocarbons in Drinking Water by Gas Chromatography Mass Spectrometry Using Negative Ion Chemical Ionization

A highly sensitive and selective method for the determination of halocarbons, such as trihalomethanes, carbon tetrachloride, tri- and tetrachloroethylene, in drinking waters have been developed by gas chromatography mass spectrometry (GC/MS) using negative ion chemical ionization (NCI). Head space m...

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Veröffentlicht in:Nippon Kagakukai shi (1972) 1984-07, Vol.1984 (7), p.1146
Hauptverfasser: DAISHIMA, Shigeki, LIDA, Yoshio, KAJIKI, Toshio
Format: Artikel
Sprache:eng
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Zusammenfassung:A highly sensitive and selective method for the determination of halocarbons, such as trihalomethanes, carbon tetrachloride, tri- and tetrachloroethylene, in drinking waters have been developed by gas chromatography mass spectrometry (GC/MS) using negative ion chemical ionization (NCI). Head space method was used for sample preparation, and 0.1 to 1 ml of head space gas was introduced into a GC/MS equipped with a DC-550 2 m-column. Methane was used as a reagent gas. The ionization chamber! pressure and ion source temperature were 0.2 Tort and 250°C, respectively. The mass fragmentograms were recorded at m/z 35(C17) and 79(Br-). These halide ions are generated effectively from halocarbons, and each component in ppt-level can be determined by using 1, 1, 1, 2-tetrachloroetfane as an internal standard. Results obtained by the proposed method were in fair agreement with those by GC-ECD. The determination limits of halocarbons were about 1-100 ppt with relative standard deviations of 2-10%.
ISSN:0369-4577
DOI:10.1246/nikkashi.1984.1146