A new, simple, and sensitive method has been developed for the spectrophotometric determination of CrVI based on its reaction with chlorpromazine-HCl (CPH) to give a red product. Under the optimum conditions, the linear range of the calibration graph was 0.00–0.33 µg mL−1 of CrVI. The molar absorptivity and the detection limit were 3.28 × 104 dm3 mol−1 cm−1 and 0.003 µg mL−1 of CrVI, respectively. Analyses of certified ores, steels, and pure nickel samples gave results in excellent agreement with the nominal values and with relative standard deviations of ≤ 1.5%
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