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- W1513636274 abstract "Iron-sulfur geochemistry is important in many natural and engineered environments, including drinking water systems. In the anaerobic environment beneath scales of corroding iron drinking water distribution system pipes, sulfate-reducing bacteria (SRB) produce sulfide from naturally occurring sulfate in the bulk water. This sulfide subsequently can affect iron geochemistry of the scale and the protective qualities of the scale. The authors studied the effect of bacterial sulfate reduction on the nature of iron corrosion scales collected from two drinking water distribution systems-one using surface water and the other groundwater but both with relatively high sulfate concentrations. Reduced sulfur proved to be a significant component of all iron scales studied, reaching up to 22% (wt%) in the scale from the groundwater system and 2% in the surface water system. X-ray diffraction showed the presence of elemental sulfur (S°) and marcasite (FeS 2 ). Sulfur extractions showed major S° and FeS 2 in all scales but only minor amounts of iron(ll) sulfide (FeS) and sulfate ion (SO 4 2- ). Sulfur isotope measurements showed δ 34 S in the scales to be 20-40 permil (parts perthousand) lighter than in the source SO 4 2- , confirming the important role of SRB in forming the reduced sulfur. Other important iron minerals found were goethite (α-FeOOH) and lepidocrocite (γ-FeOOH). Magnetite (Fe 3 O 4 ), which is believed to be an important mineral in protecting iron pipes from extensive corrosion and iron release, was present in iron scales collected from the surface water system but not in those from the groundwater system." @default.
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- W1513636274 date "2005-10-01" @default.
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- W1513636274 title "Effect of bacterial sulfate reduction on iron-corrosion scales" @default.
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- W1513636274 doi "https://doi.org/10.1002/j.1551-8833.2005.tb07500.x" @default.
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