Gaseous hydrogen sulfide determination by discoloration of lead-stabilized PVC

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Abstract
The discoloration of Pb-stabilized PVC [polyvinyl chloride] resulting from its interaction with H2S gas was investigated as a potential H2S measurement technique. Color measurements of PVC samples exposed to controlled concentrations of H2S over a range of humidities and temperatures demonstrated that toxic H2S concentrations can be detected in less than 5 min. The technique was appropriate for industrial applications such as the pretesting of manhole atmospheres prior to entry. Exposure times of several hours were sufficient to detect the much lower H2S concentrations that might be present in ambient e.g., 15 h exposures were needed for 10 .+-. 3 ppb H2S, a level typical of certain oil field, swamp and sewage treatment areas. The technique is inexpensive and can be performed by unskilled personnel.

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