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STUDY ON THE SPECTROPHOTOMETIC DETERMINATION OF IODINE BY OXIDATION DECOLORATION REACTION OF METHYL RED

Liu Huan-yun

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Abstract

In the medium of HCl,and catalysed by potassium bromide,idodic acid radical can oxidate and decolorate methyl red very well. The gap of absorbency before and after decoloration has a direct ratio with concentration of iodine.It is showed in the experiment that the maxium absorbance is at 518 nm.The linear range is 0～50 μg/25 mL.The apparent molar absorptivity of methyl red is 6.5×104 L·mol-1·cm-1.The method has been used in the determination of iodine in iodates and iodic salt and have a satisfactory results.

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What this paper is about

In the medium of HCl,and catalysed by potassium bromide,idodic acid radical can oxidate and decolorate methyl red very well. The gap of absorbency before and after decoloration has a direct ratio with concentration of iodine.It is showed in the experiment that the maxium absorbance is at 518 nm.The linear range is 0～50 μg/25 mL.The apparent molar absorptivity of methyl red is 6.5×104 L·mol-1·cm-1.The method has been used in the determination of iodine in iodates and iodic salt and have a satisfactory results.

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Available abstract

In the medium of HCl,and catalysed by potassium bromide,idodic acid radical can oxidate and decolorate methyl red very well. The gap of absorbency before and after decoloration has a direct ratio with concentration of iodine.It is showed in the experiment that the maxium absorbance is at 518 nm.The linear range is 0～50 μg/25 mL.The apparent molar absorptivity of methyl red is 6.5×104 L·mol-1·cm-1.The method has been used in the determination of iodine in iodates and iodic salt and have a satisfactory results.

Key concepts: Molar absorptivity, Iodine, Absorbance, Chemistry, Potassium bromide, Bromide, Methyl red, Salt (chemistry)

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