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    Title: Speciation of trace inorganic contaminants in corrosion scales and deposits formed in drinking water distribution systems
    Authors: Peng, C. Y.;G. V. Korshin
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Arsenic;Nickel;Manganese;Uranium;Corrosion;Surface scales;Inorganic contaminant;Mobilization;Fractionation
    Date: 2011-11-01
    Issue Date: 2015-05-15 00:33:54 (UTC+8)
    Publisher: London: I W A Publishing
    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.
    Relation: Water Research 45(17), pp.5553-5563
    DOI: 10.1016/j.watres.2011.08.017
    Appears in Collections:[水資源及環境工程學系暨研究所] 期刊論文

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