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SIZE FRACTIONATION OF METALS IN RUNOFF FROM RESIDENTIAL AND HIGHWAY STORM SEWERS
Citation:
TUCCILLO, M. E. SIZE FRACTIONATION OF METALS IN RUNOFF FROM RESIDENTIAL AND HIGHWAY STORM SEWERS. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier Science Ltd, New York, NY, 355(1-3):288-300, (2006).
Description:
Stormwater sampling for particulate, colloidal and dissolved metals and organic carbon was conducted for several storms at six outfalls draining locally-designated, nonindustrial land uses in Monmouth County, NJ. Samples were initially sequentially filtered through 5 um, 0.45 um and 0.005 um filters. Additional filtrations were later done with 10 um and 20 um filters. Of the heavy metals, Cu and Zn were mostly either dissolved (< 0.005 um) (20 - 100%) or in the particulate size fractions > 5 um (0 - > 50%). Pb and Cr were associated exclusively with particles > 5 um in size. Fe, Al and Si were found mostly in larger size fractions (> 70%), with smaller fractions in the 0.45 - 5 um size range. Organic carbon was mostly dissolved or in the 0.01 - 0.45 um size range. The Fe, Al and Si likely represent particles capable of transporting pollutants. Variable and sometimes large dissolved fractions of Cu and Zn most likely contribute to erratic performance of structural best management practices (BMPs). The size fractionation of stormwater constituents has implications for the design and performance of stormwater control structures and the aquatic toxicity risks posed by the metals.