Abstract
A gas-phase electrolytic conductivity detector (GP-ELCD), a new-type detector for GC which was recently developed by D. M. Coulson and was provided by SRI Co. in U. S. A., was applied to the measurement of ten kinds of volatile chlorinated hydrocarbons (VCHC) in environmental samples. The measurement limit of the detector to VCHC was found to be about 0.05ng under S/N=5, and the relative sensitivities on a molar basis for each compounds of VCHC depends on the number of chlorine atoms in a molecule. However those on a molecular-weight basis are in similar (0.861.00to the sensitivity of carbon tetrachloride). The variations in its sensitivity of it on the same day or on different days are within 5%. The linear dynamic range of GP-ELCD was at least 0.05-100ng in the tested range. A detector with a portable GC (SRI 9000) was used for the analysis of VCHC in ambient air with the collection method by a charcoal tube, and was confirmed to be capable of measuring the concentration of trichloroethylene and tetrachloroethylene at 1/10 of the Japan Air Quality Standard (Both; 0.2mg/m3).
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