Abstract
AbstractA new simple, rapid and sensitive spectrophotometric flow injection analysis (FIA) method is developed for the determination of chromium(VI) based on its reaction with 3,5‐Br2‐PADAP and SCN°‐ in a strongly acidic medium. This produces an unstable violet product with a maximum absorption at 605 nm. As the product formed is unstable, FIA is an ideal method to reproducibly monitor the transient signal. The calibration curve is linear over 1.0 × 10–6 to 7.0 × 10–5 mol l–1. The correlation coefficient of the calibration curve is 0.9998, the detection limit is 5.0 × 10–7Cr2O72‐ mol l–1 and sample throughput is 80 h–1. The method has been successfully applied to the determination of chromium in steel.
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