Transcription of 4-170 INORGANIC NONMETALS (4000)
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4-170 INORGANIC NONMETALS (4000)
4500-S2 SULFIDE*4500-S2 A. and SignificanceSulfide is often present in groundwater and sediment. It isproduced by decomposition of organic matter and bacterial re-duction of sulfate. It is sometimes found in industrial or munic-ipal wastewater. Hydrogen sulfide escaping into the air fromsulfide-containing wastewater causes odor nuisances. Thethreshhold odor concentration of H2S in clean water is and g/L. Gaseous H2S is very toxic and has claimedthe lives of numerous workers. At levels toxic to humans itinterferes with the olfactory system, giving a false sense of thesafe absence of H2S. It attacks metals directly, and indirectly hascaused serious corrosion of concrete sewers because it is oxi-dized biologically in the presence of oxygen to H2SO4on thepipe wall. Dissolved H2S is toxic to fish and other sulfide combines with iron and other metals innatural sediments and sludges to form slightly-soluble precipi-tates.
the example calibration curve in the electrode manual. This gives a reasonable estimate of sulfide concentration if the electrode is in good condition.
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