Determination of chromium(VI) and total chromium by inductively coupled plasma atomic emission spectrometry after preconcentration using solvent extraction and back-extraction
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Analytical Atomic Spectrometry
- Vol. 10 (10) , 881-883
- https://doi.org/10.1039/ja9951000881
Abstract
A method for determining of CrVI and CrIII in water samples by inductively coupled plasma atomic emission spectrometry after solvent extraction with tributylphosphate (TBP) and back-extraction is described. The method utilizes 10 ml of TBP and 500 ml of sample solution at pH 1. Chromium(VI) is back-extracted from the organic phase by 20 ml of solution containing ammonium acetate (3 mol l–1) and ammonium carbonate (3 mol l–1), and determined by ICP-AES. The optimum conditions for quantitative extraction and back-extraction of CrVI were examined, including, pH of sample solution, ratio of aqueous-to-organic phase and concentration and volume of ammonium acetate–ammonium carbonate for back-extraction. Total Cr can be determined after oxidation of CrIII to CrVI by KMnO4 in acid media. Chromium(III) can be calculated by difference. The relative standard deviations for ten replicate analyses were 1.8%(for 20 µg l–1 of CrVI) and 1.6%(for 40 µg l–1 of total Cr). The detection limits for CrVI and total Cr were calculated to be 1.0 and 0.9 µg l–1, respectively.Keywords
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