A method for the personal monitoring of hydrogen sulfide utilizing permeation sampling

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Abstract
A method for sampling and determination of personal exposure to H2S was described. Samples were collected by permeation through a dimethyl silicone membrane into 10 ml of 0.2 N NaOH containing EDTA. Collected H2S was converted to a colored product (methylene blue) measured spectrophotometrically and H2S exposure (time-weighted-average) calculated. The detection limit of the method was 0.01 ppm (0.014 mg/m3) for an 8 h exposure with a working range of 0.1-20 ppm and linear response up to 200 ppm H2S. The device responded in < 30 s and was unaffected by variations in humidity and temperature. The only significant interference observed was from Cl (-6.6%). The use of EDTA increased S= stability as to allow for sampling of over 1 wk. A device could be constructed that was small in weight and size, serving as a personal or area monitor.

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