Abstract
Preconcentration method with collection of metal complexes on a chitin has been applied to the spectrophotometric determination of chromium(VI) in water. The chromium(VI) is collected as its 1,5-diphenylcarbazide(DPC) complex on a column of chitin in the presence of dodecyl sulfate as counter-ion. The Cr-DPC complex retained on the chitin is eluted with a methanol-1 M acetic acid mixture (7:3, v/v), and the absorbance of the eluent is measured at 541 nm. Beer’s law is obeyed over the concentration range of 0.05–0.6 μg of chromium(VI) in 1 ml of the eluent. The apparent molar absorptivity is 3.5×10 4 dm 3 mol −1 cm −1. The tolerance limits for Fe(III) is low, i.e. ten times that of chromium(VI), but some metal ions and common inorganic anions do not interfere in concentration range of 100–10 000 times that of chromium(VI). The present method can be applied to the determination of chromium(VI) in natural water samples.
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