Speciation of chromium (VI) and total chromium determination in welding dust samples by flow-injection analysis coupled to atomic absorption spectrometry

We have studied the speciation of chromium (VI) in stainless-steel welding dusts. The approach used for the analysis of Cr(VI) and total Cr relies on a flow-injection analyzer (FIA) equipped with two different sequential detectors. The system measures Cr(VI). by colorimetry (with 1,5-diphenyl carboh...

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Bibliographic Details
Published in:Talanta (Oxford) 1996-11, Vol.43 (11), p.1965-1974
Main Authors: Girard, Louise, Hubert, Joseph
Format: Article
Language:English
Subjects:
Analytical chemistry
Atomic absorption spectrometry
Chemistry
Chromium
Exact sciences and technology
Flow-injection analysis
Speciation
Spectrometric and optical methods
Welding dust
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Summary:We have studied the speciation of chromium (VI) in stainless-steel welding dusts. The approach used for the analysis of Cr(VI) and total Cr relies on a flow-injection analyzer (FIA) equipped with two different sequential detectors. The system measures Cr(VI). by colorimetry (with 1,5-diphenyl carbohydrazide) and total chromium content by flame atomic absorption spectroscopy (AAS). The extraction of the samples of welding-fume dusts is achieved in a buffer solution (acetic acid and sodium acetate at pH 4). This extraction procedure gives a 96% recovery of chromium (VI). The FIA-AAS system that has been described is also more sensitive, has a lower detection limit (0.005 μg ml −1) and gives a better precision (< 1%) than other equivalent systems that have been previously described.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(96)01985-6