Flow-injection extraction-spectrophotometric determination of permanganate with the ethylene-bis(triphenylphosphonium) cation |
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Authors: | DThorburn Burns N Chimpalee M Harriott GM Mckillen |
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Institution: | Department of Analytical Chemistry, The Queen''s University of Belfast, Belfast BT9 5AG Great Britain |
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Abstract: | Permanganate is determined spectrophotometrically at 545 nm after extraction into chloroform of the ion-associate, ethylene -bis (triphenylphosphonium) permanganate. The carrier stream is pH 6 buffer containing 10% (w/v) ammonium fluoride and the reagent stream is 0.25% (w/v) ethylene-bis (triphenylphosphonium) bromide. The injection rate is 24 h?1. Th calibration graph is linear up to 25 μg ml?1 and the detection limit is 0.58 μg m?1 Mn (VII), based on 250- μl injections. The system is applied to the determination of manganese in a range of steels. |
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