ELECTROCHEMICAL GAS-CHROMATOGRAPHIC DETECTION OF HYDROGEN-SULFIDE AT PPM AND PPB LEVELS

An electrochemical detector for gas chromatographic analysis of hydrogen sulfide is described and its operating characteristics are discussed. The detector operation is based upon the measurement of the current when hydrogen sulfide is electrochemically oxidized at a diffusion electrode. The lower detectable limit was 3 multiplied by 10** minus **1**2 grams H//2S, the precision was 0. 5% and analysis was achieved within 2 minutes. Accuracy was limited principally by the preparation of calibration samples and the availability of standard reference gas mixtures. 19 refs.