The adsorption characteristics of Cr(VI) in the form of − 2 72 O Cr ion from aqueous solution onto synthetic exchanger Amberlite IRA 400(Cl) resin was studied from UV -visible spectrphotometric measurement using DPC at 580nm. The efficiency of the adsorbent was judged from the variation of the % adsorption with (i) contact time, (ii) adsorbent dose and (iii) initial metal ion concentration. For the optimum adsorbent dose, the highest % adsorption was found to be 99.92% at 30ppm metal ion concentration.
This study involved the determination of trace elements in drinking water in Offa Metropolis. Drinking water samples were collected from tap, well, borehole, stream and sachet water and analysed for Cr, Co, Cu, Fe, Mg and Mn using Atomic Absorption Spectrophotometer. The results obtained show the concentration ranges of the metals in the samples as follows: Cr (0.01-0.27)mgL-1 , Co (0.000-0.018) mgL-1 , Cu (0.001-0.023) mgL-1 , Fe (0.025-0.13) mgL-1 , Mg (0.007-0.082) mgL-1 and Mn (0.002-0.009) mgL-1. In conclusion these concentrations are within the permissible limit of the WHO drinking water quality guidelines except chromium with twenty-one samples above the WHO threshold limit and four samples within the limit.
The heavy metals contents (Pb, Cu, Fe, Cr, Cd, Zn, Mn and Ni) in Municipal dumpsite compost were determined by the sequential extraction method. Chemical parameters such as pH, conductivity, and organic carbon contents of the samples were also determined. Analysis of the extracts was carried out by atomic absorption spectrophotometer machine (Buck Scientific VPG 210). Results of these analyses showed that Pb, Ni, Cr, Mn and Fe were largely associated with residual fraction (53.06%, 56.26%, 58.15%, 59.14% and 64.10% respectively). Cu, Cd and Zn were largely associated with non-residual fractions (71.42%, 54.44%, and 54.15% respectively). Calculated mobility and bioavailability factors of Cd, Zn and Cu were also high (54.
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