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Abstract
Lead acetate impregnated ceramic tiles are useful devices for determining H2S levels in the outdoor air. The exposure of tiles in simple shelters and for an overnight period is effective in an areawide sampling program to determine: (1) whether a significant H2S source exists, (2) the source location, (3) the area affected, and (4) the relative intensity pattern.
On the basis of an overnight exposure, tiles can “see” a mean H2S concentration range of 0.003 to 0.3 ppm. The lower level of sensitivity is near 0.03 ppm X hr. Hence, tiles offer a way to verify whether hourly air quality standards are being exceeded.
Tiles can be qualitatively evaluated against: experience, known effects, or by ranking against each other. Tiles can be semi-quantitatively evaluated by visual grading against painted standards developed by exposing tiles of particular manufacture to known H2S dosages.