Flow-injection extraction spectrophotometric determinatin of chromium(VI) with the benzyltributylammonium cation

Chromium(VI) can be determined spectrophotometrically at 365 nm after flow-injection extraction into chloroform of the ion associate benzyltributylammonium dichromate. The carrier stream was distilled water, merged with 1.0 M sulphuric acid solution, the reagent stream was 0.5% (w/v) benzyltributyla...

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Bibliographic Details
Published in:Analytica chimica acta 1993-02, Vol.272 (1), p.135-138
Main Authors: Barakat, S.A., Burns, D.Thorburn, Harriott, Michael
Format: Article
Language:English
Subjects:
Benzyltributylammonium dichromate extraction
Chromium
Flow injection
Spectrophotometry
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Summary:Chromium(VI) can be determined spectrophotometrically at 365 nm after flow-injection extraction into chloroform of the ion associate benzyltributylammonium dichromate. The carrier stream was distilled water, merged with 1.0 M sulphuric acid solution, the reagent stream was 0.5% (w/v) benzyltributylammonium chloride solution. The injection rate was 20 h −1. The calibration graph was linear up to 20 μg ml −1 and the detection limit (3 × baseline noise) was 0.5 μg ml −1 Cr(VI) based on 250-μl injection volumes. The system has been applied to the determination of chromium in steels.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(93)80384-W