Hydrogen sulfide gas is lethal in relatively low concentrations. Detect H2S down to as low as 3ppm with Indigo lead acetate test papers for only $2.95 per 100 strips.
Hydrogen sulfide has a distinct sulfurous odor and can indicate bacterial contamination. It is also added to odorless natural gas to help indicate a gas leak.
Lead acetate test strips are a cheap & simple method of hydrogen sulfide detection in both water & air. Simply dip in water & check for a color change. To measure H2S gas in air, wet the strip first; if present, the strip will change color. More examples below.
These test papers do not come with a color chart but the presence and relative concentration of hydrogen sulfide is readily apparent. While normally specified with a 5ppm detection sensitivity, 1-3ppm appears to sufficient to slowly cause the white test paper to turn grey. As the concentration approaches the dangerous level of 400ppm, the change proceeds very rapidly.
This paper on how to use lead acetate paper to test for sulfur in materials lists some procedures. Some of the tools mentioned are listed in Related Products below.
Test Strip Documentation
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