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- W2619372610 abstract "Lead exposure via drinking water remains a significant public health risk; this study explored the potential effects of upstream iron corrosion on lead mobility in water distribution systems. Specifically, galvanic corrosion of lead by iron (oxyhydr)oxides was investigated. Coupling an iron mineral cathode with metallic lead in a galvanic cell increased lead release by 531 μg L-1 on average-a 9-fold increase over uniform corrosion in the absence of iron. Cathodes were composed of spark plasma sintered Fe3O4 or α-Fe2O3 or field-extracted Fe3O4 and α-FeOOH. Orthophosphate immobilized oxidized lead as insoluble hydroxypyromorphite, while humic acid enhanced lead mobility. Addition of a humic isolate increased lead release due to uniform corrosion by 81 μg L-1 and-upon coupling lead to a mineral cathode-release due to galvanic corrosion by 990 μg L-1. Elevated lead in the presence of humic acid appeared to be driven by complexation, with 208Pb and UV254 size-exclusion chromatograms exhibiting strong correlation under these conditions (R2average = 0.87). A significant iron corrosion effect was consistent with field data: lead levels after lead service line replacement were greater by factors of 2.3-4.7 at sites supplied by unlined cast iron distribution mains compared with the alternative, lined ductile iron." @default.
- W2619372610 created "2017-06-05" @default.
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- W2619372610 date "2017-06-08" @default.
- W2619372610 modified "2023-10-12" @default.
- W2619372610 title "Galvanic Corrosion of Lead by Iron (Oxyhydr)Oxides: Potential Impacts on Drinking Water Quality" @default.
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- W2619372610 doi "https://doi.org/10.1021/acs.est.7b01671" @default.
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