Elevation of CD,Cu.and PB levels in the surface sediments collected from drainage receiving metal industrial effluents in Selangor, Malaysia: an Islamic perspective

Abstract

Surface sediments were collected in April 2005 from a drainage receiving metal industrial effluents from Serdang in addition to 6 sampling sites from intertidal area and 4 urban drainage sites. The sediment samples were analysed for Cd, Cu and Pb. The metal concentrations at the Serdang industrial drainage sediments were 15.9 ??g/g dw for Cd, 1003.5 ug/g dw for Cu and 1267 ug/g dw for Pb. These metal levels were significantly (P<0.05) higher than those in the sediments collected from intertidal area (6 sites) and other urban drainages (4 sites) [Cd: 1,39 3.41 ??g/g dw; Cu: 6.64-122.7??g/g dw; Pb: 26.0-227.7??g/g dw]. Based on the concentrations of Cd, Cu and Pb in the four geochemical fractions [easily, freely, leachable or exchangeable (EFLE), acid-reducible and oxidisable-organic], these geochemical fractions also revealed anthropogenic sources of these metals in some of the sampling sites including Serdang industrial drainage sediments. Thus, the elevated concentrations of Cu, Cd and Pb in the sediments collected from Serdang industrial drainage sediments were evidently receiving point source industrial effluent from the nearby metal factory. Therefore treatment on the factory effluent based on the present findings is necessary.