Speciation of trace inorganic contaminants in corrosion scales and deposits formed in drinking water distribution systems |
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Authors: | Peng Ching-Yu Korshin Gregory V |
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Affiliation: | Department of Civil and Environmental Engineering, University of Washington, Box 352700, Seattle, WA 98105-2700, United States |
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Abstract: | Sequential extractions utilizing the modified Tessier scheme (Krishnamurti et al., 1995) and measurements of soluble and particulate metal released from suspended solids were used in this study to determine the speciation and mobility of inorganic contaminants (As, Cr, V, U, Cd, Ni, and Mn) found in corrosion scales and particles mobilized during hydraulic flushing events. Arsenic, chromium and vanadium are primarily associated with the mobilization-resistant fraction that is resistant to all eluents used in this study and also bound in highly stable crystalline iron oxides. Very low concentrations of these elements were released in resuspension experiments. X-ray absorbance measurements demonstrated that arsenic in the sample with the highest As concentration was dominated by As(V) bound by iron oxides. Significant fractions of uranium and cadmium were associated with carbonate solids. Nickel and manganese were determined to be more mobile and significantly associated with organic fractions. This may indicate that biofilms and natural organic matter in the drinking water distributions systems play an important role in the accumulation and release of these inorganic contaminants. |
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Keywords: | Arsenic Nickel Manganese Uranium Corrosion Surface scales Inorganic contaminant Mobilization Fractionation |
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