Abstract
In urban drainage, metals partition between dissolved ( fd ) and particulate ( fp ) phases. Metals also distribute across particulate matter (PM) gradations. In this study, granulometric metal distributions were examined for similar urban paved source areas in Baton Rouge, La.; Cincinnati; New Orleans; Little Rock, Ark.; and N. Little Rock, Ark. Metal distributions were examined for PM fractions from 4,750 μm , as suspended ( 75 μm bed load) fractions. For all areas, analysis of PM indicated that metal mass and concentration ( mole/ m2 ) were distributed across the gradation. A cumulative gamma distribution constitutive model related metal mass and PM size. The study focused on Baton Rouge, La. where event-based and composited PM metal distributions were statistically similar. For influent and settled runoff, fp dominated Cr, Cu, Zn, As, Cd, and Pb partitioning. Influent Cu, Zn, Cd, and Pb exceeded discharge criteria for receiving water ben...
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