Abstract

Instrumental techniques are compared for usage in the determination of atmospheric H₂S which has been preconcentrated on Cd(II)-exchanged zeolite. The study covers the range of 0.01 to 100 μg of immobilized sulfide. For high concentrations (2-100 μg), combustion analysis followed by nondispersive IR is the simplest and most precise technique, and results with the use of this method are accurate to ±3% relative. In the range of 0.25-40 μg, the sulfide, after conversion to methylene blue, may be determined by conventional spectrophotometry, with a relative precision of ±13%. For the lowest concentration range investigated (0.01-2.0 μg), photoacoustic spectroscopy gave the only quantitative results after the H₂S was converted to methylene blue.

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