Evaluation of Heavy Metals in some selected Waste Dumpsites in Gboko Metropolis, Benue State, Nigeria

Journal of Chemical, Biological and Physical Sciences (Impact Factor: 0.72). 01/2013; 3(1):575-580.
Download full-text


Available from: Benjamin Anhwange, Sep 30, 2015
55 Reads
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The objectives of this study was to investigate the chemical fractionation, mobility and bioavailability of Cd, Cu, Mn, Pb and Zn in refuse waste soils of some dumpsites in Zaria metropolis. The heavy metals in the waste soils samples were sequentially extracted and measured using atomic absorption spectrometry. Mean of total extractable metals in the samples analysed for Cd, Cu, Mn, Pb and Zn ranged from 25.86 - 95.71, 1.70 - 446.43, 141.92 - 423.22, 39.9 - 739.10, and 122.45 - 511.57 mgKg-1 dry weight, respectively. Cd and Pb were mostly found to be in the mobile phase of the samples indicating that the metals are potentially more bioavailable to the environment than the other metals studied. Overall, the order of mobility and bioavailability of the metals is Cd > Pb > Zn > Mn > Cu.
  • Advanced Materials Research 01/2007; 18-19:495-500. DOI:10.4028/
  • [Show abstract] [Hide abstract]
    ABSTRACT: The accurate study of heavy metal speciation is important in environmental monitoring. There has been much work developing various operationally defined speciation methods for soil and sediment, but there is a need to compare the different approaches by evaluating them for the same sample. In this article, a kinetic method was applied for the heavy metal speciation of the two BCR reference materials, CRM601 and BCR701, which have been specifically developed as materials to evaluate the validated BCR three-step sequential extraction method. When EDTA was used as an extractant, 81.0% of Cd, 68.0% of Cu, 21.5% of Ni, 80.3% of Pb and 71.9% of Zn was extracted from CRM601. For BCR701, the removal ratios were 92.0, 52.3, 18.7, 50.6 and 67.5% with EDTA and 95.7, 25.2, 20.0, 52.4 and 68.5% with hydroxylamine hydrochloride as an extractant, for Cd, Cu, Ni, Pb and Zn respectively. A two-component kinetic model was applied to the extraction curve and the extractable metals were readily classified into two categories, namely, labile fraction and non-labile fractions. The rate constants obtained from the regression model were found to be useful in quantifying the lability of an element. The rate constants obtained from the labile fractions in BCR701 were higher than that of obtained from CRM601, which indicated the high lability of metals in BCR701. When compared with the sequential extraction data, it seemed that the lability of an element was positively correlated to the first step extraction fraction.
    International Journal of Environmental Analytical Chemistry 04/2006; 86(5):359-366. DOI:10.1080/03067310500227803 · 1.30 Impact Factor