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High-performance flow flame atomic absorption spectrometry for automated on-line separation and determination of chromium(III)/chromium(VI) and preconcentration of chromium(VI)



High-performance flow flame atomic absorption spectrometry for automated on-line separation and determination of chromium(III)/chromium(VI) and preconcentration of chromium(VI)



Analytical Chemistry 65(19): 2590-2595



High-performance flow atomic spectrometry permits the fully automated separation of Cr(III)/ Cr(VI) species and subsequent flame AAS determination within only 1 min. An HPLC integrator at the output of the flame AA spectrometer renders possible the simultaneous signal processing of both oxidation states. Samples of drinking water, waste water, and extracts of soils were investigated. The relevant detection limits are 0.03 Cr(III) or 0.02 mu-g/mL Cr(VI) (3-sigma values, N = 25). The relative standard deviation amounts to apprx 1% (N = 10, 1 mu-g/ mL). With the same type of chromium speciation column (modified C18 type), Cr(VI) can be preconcentrated from drinking water and then determined online by flame AAS within 3.5 min. A detection limit of 0.5 mu-g/L (3-sigma value) can be attained when a sample volume of 5 mL is used; the standard deviation is 3.1 (10 mu-g/L Cr(VI)) or 1.5% (100 mu-g/L Cr(VI)).

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Accession: 008774529

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DOI: 10.1021/ac00067a008


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