2009•Zhongguo tiaoweipinRequires access
Spectrophotometric determination of iodine in salt adding iodine by decoloration of crystal violet.
Ying‐Hong Liu, Weixing Ma, XU Xing-you, Qian He, Ou Sha
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Abstract
In the medium of H2SO4 and in the presence of KBr,the color of crystal violet oxidized by iodide can be faded,and the degree of color fading is proportional to the concentration of iodide,and a new spectrophotometric method for determination of iodides reported.The maxium absorbance is at 630 nm.Beer's law is obeyed from 5 to 42 μg of iodine per 10 mL of solution.The apparent molar absorptivity is 1.1 × 104 L·mol-1 ·cm-1.The method has been used in the determination of iodine in iodine-spiked salt with satisfactory results.