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On-line chromatographic separation and determination of chromium(III) and chromium(VI) with preconcentration of the chromium(III) using potassium hydrogen phthalate, in various samples by flame atomic absorption spectrometry



On-line chromatographic separation and determination of chromium(III) and chromium(VI) with preconcentration of the chromium(III) using potassium hydrogen phthalate, in various samples by flame atomic absorption spectrometry



Journal of Analytical Atomic Spectrometry 11(11): 1067-1074



A method has been developed for the on-line LC separation of Cr-III on a reversed-phase C-18 column in the presence of potassium hydrogen phthalate, which is a recently introduced reagent for chromatography. It is much more selective for Cr-III in contrast to many other complex-forming agents discussed in the literature, so that in its presence virtually no almost no interferences due to the matrix are found during the detection of Cr-III. The Cr-III sorbed onto the column was eluted into the flame of an atomic absorption spectrometer using a mixture of methanol and water (80-20(% (v/v)). With 100 mu-l of sample solution the detection limits (3-sigma) were found to be 0.024 and 0.075 mg l-1 for the separation of Cr-III and Cr-VI with FAAS detection and the period needed for separation was under 60 s. For the preconcentration of the Cr-III content of a 5 ml sample solution, the detection limit (3-sigma) was 0.73 ng ml-1, the accuracy of the measurement was 3.8% RSD for the preconcentration of 20 ng ml-1 of Cr-III. The sensitivity of the method enabled the determination of the Cr-III and Cr-VI content of surface waters and various samples of natural origin at concentrations below ng ml-1 to be made. After reduction of Cr-VI to Cr-III with ascorbic acid and its preconcentration, the total Cr content of various samples could be determined.

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Accession: 009129266

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DOI: 10.1039/ja9961101067


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