Abstract
A simple and sensitive method using mini-column packed with multi-walled carbon nanotubes (MWCNTs) combined with graphite furnace atomic absorption spectrometry (GFAAS) for preconcentration and determination of ultra trace amounts of As(III) in an aqueous medium is proposed. The procedure is based on the solid phase extraction of the As(III)-sodium diethyldithiocarbamate (As-NaDDTC) chelate on MWCNTs. Various parameters such as the effect of pH, eluent type and volume, amount of sorbent, and matrix effects on the quantitative recoveries of analyte ions were evaluated. It was found that sorption is quantitative and desorption occurs with 4.0mL of 3.0molL−1 HNO3 in acetone. The limit of detection of the method was 0.008ngmL−1 for GFAAS with enrichment factor of 125 and the relative standard deviation (RSD) 0.97% (n=8, C=10ngmL−1). This method has been applied to the determination of ultra trace As(III) in water and rice plant and its ash successfully.
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