Add time:08/27/2019         Source:sciencedirect.com

Chromium(VI) (0–5 μg) can be determined spectrophotometrically at 365 nm after flow-injection extraction into chloroform of the ion-associate, tetramethylenebis(triphenylphosphonium) dichromate. The carrier stream is distilled water and the reagent stream contains 1 M sulphuric acid and 0.5% (w/v) tetramethylenebis(triphenylphosphonium) bromide. The sampling rate is 24 h−1. The calibration graph is linear up to 20 μg ml−1 and the detection limit is 0.44 μg ml−1 chromium, based on injection volumes of 250 μl. The system has been applied to the determination of chromium in a range of steels.

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