I. Introduction
Hydrogen sulfide (H2S) is a colorless and flammable gas with a strong, unpleasant odor. Consequently, air mixtures with as little as 0.3 ppb H2S are associated with a rotten egg odor. At mixing ratios above approximately 100 ppm, H2S becomes odorless and highly toxic, causing irritation of the upper respiratory tract. While prolonged exposure can lead to pulmonary edema, exposure to 500 ppm of H2S can cause a person to lose consciousness within 5 min and die within an hour [1]. Sulfur compounds that can generate H2S most frequently appear in industrial environments [2].