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Journal of Analytical Methods in Chemistry
Volume 2012 (2012), Article ID 438701, 6 pages
http://dx.doi.org/10.1155/2012/438701
Research Article

Direct Quantitative Analysis of Arsenic in Coal Fly Ash

Department of Environmental and Renewable Energy System, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

Received 15 June 2012; Revised 16 October 2012; Accepted 15 November 2012

Academic Editor: Juan F. Garcia-Reyes

Copyright © 2012 Sri Hartuti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A rapid, simple method based on graphite furnace atomic absorption spectrometry is described for the direct determination of arsenic in coal fly ash. Solid samples were directly introduced into the atomizer without preliminary treatment. The direct analysis method was not always free of spectral matrix interference, but the stabilization of arsenic by adding palladium nitrate (chemical modifier) and the optimization of the parameters in the furnace program (temperature, rate of temperature increase, hold time, and argon gas flow) gave good results for the total arsenic determination. The optimal furnace program was determined by analyzing different concentrations of a reference material (NIST1633b), which showed the best linearity for calibration. The optimized parameters for the furnace programs for the ashing and atomization steps were as follows: temperatures of 500–1200 and 2150°C, heating rates of 100 and 500°C s−1, hold times of 90 and 7 s, and medium then maximum and medium argon gas flows, respectively. The calibration plots were linear with a correlation coefficient of 0.9699. This method was validated using arsenic-containing raw coal samples in accordance with the requirements of the mass balance calculation; the distribution rate of As in the fly ashes ranged from 101 to 119%.