Article ID Journal Published Year Pages File Type
1244870 Talanta 2007 7 Pages PDF
Abstract

The concentrations of chromium (III) and (VI) in fly ash from nine Australian coal fired power stations were determined. Cr(VI) was completely leached by extraction with 0.01 M NaOH solution and the concentration was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). This was confirmed by determining Cr(III) and Cr(VI) in the extracts of fly ash that had been spiked with chromium salts. These analytical measurements were done using a combination of ion-exchange chromatography and ICP-AES. The elutant was 0.05 M HNO3 containing 0.5%-CH3OH. When the column was operated at a flow rate of 1.2 ml min−1 and samples were injected by use of a sample loop with a volume of 100 μl, Cr(III) and Cr(VI) in sample solution was exclusively separated within approximately 10 min. The detection limits (3σ) were 5 ng for Cr(III) (0.050 mg l−1) and 9 ng for Cr(VI) (0.090 mg l−1), respectively. A relative standard deviation of 1.9% (n = 6) was obtained for the determination by IC–ICP–AES of 0.25 mg l−1 Cr(III) and Cr(VI).

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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