Concentrations and physicochemical speciation of heavy metals in urban runoff sediment from Sao Goncalo-Rio de Janeiro/Brazil

摘要

Urban runoff sediment samples were analyzed for heavy metal concentrations in different neighborhoods in Sao Goncalo, Metropolitan region of Rio de Janeiro-Brazil. This study was undertaken to assess the anthropogenic impact of metal concentrations of urban roadside sediments from Sao Gonc, alo and to estimate the potential mobility of selected metals (Zn, Cu, Pb, Cr and Ni) using a sequential partitioning extraction. The concentrations of heavy metals in this work were compared with reported values from other cities and urban areas. This study highlights the urban runoff sediment as a potential source for heavy metals. The physicochemical speciation of heavy metal highlight the potential bioavailability for all metals, but Cr. Three contamination indexes: geoaccumulation index, contamination factor and Pollution Load Index, were used in order to assess the level of metal contamination in the study area, which demonstrated the contamination originating from the urban runoff sediments.