Other
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41...73z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 1, pp.73-79
Other
Scientific paper
Methods were developed for stabilizing SO 2 in water and gas samples. The pararosaniline colorimetric method, and a gas Chromatographic method using a flame photometric detector specific for sulfur gases were used to assay SO 2 . Assays were also performed for sulfide, elemental sulfur and sulfate. A large number of acidic, neutral, and alkaline springs in Yellowstone National Park were sampled: SO 2 was found in small amounts in most of them. The highest concentration detected in water was 0.5-0.6 g/ml (expressed as sulfur). Sulfur dioxide was never detected in gases emanating from hot springs, or in fumaroles, although H 2 S was readily detected. Because of the high solubility of SO 2 in water, and its low pK , it is unlikely that environmentally significant quantities are volatilized from geothermal systems of the low-temperature type characteristic of Yellowstone Park. Laboratory studies suggest that in acid waters, ferric iron is the primary oxidant, as H 2 S is not oxidized by O 2 at low pH. At neutral or alkaline pH, O 2 is the likely oxidant, because sulfide is oxidized by O 2 at these pH values, and neutral and alkaline hot springs are always low in iron. Although bacteria capable of oxidizing sulfide and elemental sulfur are present in most of the springs sampled, it is concluded that the oxidation of reduced sulfur compounds to sulfur dioxide is primarily a chemical process, because of the rapidity with which it occurs and the lack of any evidence that bacteria produce sulfur dioxide.
Brock Thomas D.
Zinder Stephen
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