Analysis of road-deposited sediments for heavy metal pollutants in bridge sidewalks of Iloilo City, Philippines.

H. S. Taberna, M. G. G. Nillos,L. T. Gamarcha,Ida G. Pahila, A. N. Gastar

AES Bioflux(2014)

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摘要
Road-deposited sediment is one of the major sources of heavy metals pollution of urban waterways. This study determined the presence of heavy metals: Cr, Cu, Pb, and Zn in road-deposited sediments collected from bridge sidewalks in Iloilo City, Philippines, using cold HCl as extractant to represent the “leachable” form of the metals, which is considered the most bioavailable. In general, mean heavy metal concentrations in sediments from all bridge sites were significantly different from background values. Concentrations of Cu and Pb were found to be up to 7 and 6 folds higher than the background values, respectively. Zn had the highest concentration and up to 14 fold higher than the background. A significant correlation was observed between Cr and Zn, and Cu and Pb indicating similar industrial and traffic sources. High positive correlations (R = 0.650–0.915) were observed between heavy metals concentrations and the number of vehicles per hour passing through the bridges. With the exception of Pb, the road-deposited sediment samples collected in Iloilo City showed much lower heavy metal concentrations compared to those reported for urban environments in other countries. Over-all, all heavy metals concentrations were observed to be higher for all sites during the dry season. The metals analyzed in this study have all been detected in the Iloilo River estuary sediment and water at concentrations exceeding the guideline levels of the Philippine Department of Environment and Natural Resources (DENR).
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关键词
pollutants,sediment,lead,copper,zinc,chromium,water pollution
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