temperature effect on water extractability of cadmium, copper, lead and zinc from composted organic solid wastes of south-west nigeria温度影响水的可萃取性镉、铜、铅和锌有机固体废弃物堆肥的尼日利亚西南部.pdf

Int. J. Environ. Res. Public Health 2009, 6, 2397-2407; doi:10.3390/ijerph6092397 OPEN ACCESS International Journal of Environmental Research and Public Health ISSN 1660-4601 /journal/ijerph Article Temperature Effect on Water Extractability of Cadmium, Copper, Lead and Zinc from Composted Organic Solid Wastes of South-West Nigeria Iheoma M. Adekunle Department of Environmental Management and Toxicology, University of Agriculture, Abeokuta, P.M.B. 2240, Nigeria ; E-Mail; imkunle@ Received: 20 July 2009 / Accepted: 26 August 2009 / Published: 7 September 2009 Abstract: The effect of temperature changes (10 to 80 °C) on water-extractable metal (Zn, Cu, Cd and Pb) concentrations of composted wastes of Nigerian origin was investigated in batch extraction experiments. Metal concentrations were measured using a calibrated atomic absorption spectrophometer after acid digestions. Results showed that the water- extractable metal fractions (I) did not exceed 10% of total metal concentrations of the bulk composts, which corresponded to 0.30 to 6.63% for Zn, 0.09 to 7.51% for Pb, 1.83 to 9.29% for Cu and 0.67 to 9.23% for Cd. Water extractable metal fraction showed positive correlations (r = 0.137 to 0.917*; p* 0.01) for Cu, Cd and Pb in most cases but negative for Zn (–0.067 to –0.445). Simulations revea