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Authors
Affiliations
1 School of Environment and Earth Sciences, North Maharashtra University, Jalgaon (M.S.), IN
Source
The Asian Journal of Experimental Chemistry, Vol 4, No 1-2 (2009), Pagination: 64-69
Abstract
An attempt is made to study the extractability of heavy metals from fly ash generated from Thermal Power Plant which is used as an admixture with cement, brick manufacturing, land filling and in agriculture. From the utilization point of view, it was notable that the total heavy metal concentrations (Cu, Pb, Zn, Ni, Fe, and Mn) in fly ash from a coal-fired power plant were lower than those limit values. A six-stage sequential extraction procedure was used to evaluate the extractability of different elements in fly ash into the following fractions: (1) the water-soluble fraction, (2) the exchangeable fraction (1M MgCl2 at pH 7), (3) Carbonate bound (1M Na-OAC at pH 5), (4) Fe- Mn bounded (0.04M NH2OH, HCl in 25% acetic acid), (5) Organically bound (0.02 M nitric acid and 30% H2O2 at pH 2 and 90oC, followed by 1.2 M ammonium acetate in 10% nitric acid) and (6) Residual metal ions (HNO3 and HClO4 acid digestion until dryness).
Keywords
Sequential Extraction, Fly Ash and Heavy Metals.
