2000•Analytical LaboratoryRequires access

Kinetic Spectrophotometric Determination of Trace Amount of Cr(VI)

Yan Jin

Abstract

A new kinetic spectrophotometric method for the determination of Cr(Ⅵ) based on its catalytic effect of the oxidation of Rhodamine B by potassium bromate was established.Beer's law is obeyd for Cr(Ⅵ) in the range of 0～1.0μg/25 mL.The detection limit of the method is 1.24×10 -6 g/L Cr(Ⅵ).The method has been used to determine trace Cr(Ⅵ) in natural water and electroplating water with satisfactory results.

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Key concepts: Chemistry, Potassium bromate, Potassium periodate, Detection limit, Rhodamine B, Bromate, Kinetic energy, Spectrophotometry