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Flow-injection extraction-spectrophotometric determination of manganese(VII) with benzyltributylammonium cations

✍ Scribed by D. Thorburn Burns; S.A. Barakat; M. Harriott; M.S. El-Shahawi

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 201 KB
Volume: 270
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)80109-k

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✦ Synopsis

A flow-injection manifold has been developed for the spectrophotometric determination of manganese(VII) at 548 nm after extraction into chloroform of the ion-associate, benzyltributylammonium permanganate. The carrier stream was a pH 6 buffer containing 10% (w/v) ammonium fluoride and the reagent stream was 0.10% (w/v) benzyltributylammonium chloride. The injection rate was 20 h 1. The calibration graph is linear up to 25/xg ml 1 and the detection limit (3 × baseline noise) is 0.91 /zg ml -i Mn(VII), based on 250-/xl injection volumes. The system has been applied to the determination of manganese in steels and a cupro-nickel alloy.

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