Hydrogen sulfide

Sudden death among sewerage workers is the most familiar form of hydrogen sulphide poisoning. This colorless, flammable gas has a characteristic odor of rotten eggs. It is produced naturally and as a result of human activity. Natural sources include nonspecific and anaerobic bacterial reduction of sulphates and sulphur-containing organic compounds. Hydrogen sulphide is found naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It is also found in ground water. It is released from stagnant or polluted waters and manure or coal pits. In the industry, it is used as an intermediate in the manufacture of sulphuric acid and inorganic sulphides and as an agricultural disinfectant.--Publisher's description.