2003•Chinese Journal of Spectroscopy LaboratoryRequires access

Spectrophotometric Determination of Iodine by Oxidation-Decoloration of Rhodamine B

Xuhui Mao

Abstract

A new method has been developed for the determination of the trace of iodine by oxidation-decoloration with rhodamine B.The color system has a maximum absorption at 490nm in the medium of sulfuric acid with a molar absorptivity of 1.5×10 4L·mol -1·cm -1.Beer's law is obeyed in the range of 0-30μg/10mL of iodate.The detection limit is 1.2×10 -7mol/L.The method can be used for determination of the trace iodine in the salts.

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Key concepts: Molar absorptivity, Iodate, Iodine, Chemistry, Rhodamine B, Sulfuric acid, Detection limit, Spectrophotometry