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Study on the Spectrophotometric Determination of Iodine by Oxidation Decoloration of Methyl Orange

Liu Kang-le

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Abstract

In the medium of H_2SO_4 and catalyzed by potassium bromide,iodate can oxidize and decolorize methyl orange very well.The optimum reaction conditions for the spectrophotometric determination of a trace amount of iodine were found.The maxium absorbance is at 508 nm,and the linear range is 0～50 μg/(50 mL).The apparent molar absorptivity is 3.13×10~4 L/(mol·cm).The method has been used in the determination of iodine in foods with satisfactory results.

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What this paper is about

In the medium of H_2SO_4 and catalyzed by potassium bromide,iodate can oxidize and decolorize methyl orange very well.The optimum reaction conditions for the spectrophotometric determination of a trace amount of iodine were found.The maxium absorbance is at 508 nm,and the linear range is 0～50 μg/(50 mL).The apparent molar absorptivity is 3.13×10~4 L/(mol·cm).The method has been used in the determination of iodine in foods with satisfactory results.

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Available abstract

In the medium of H_2SO_4 and catalyzed by potassium bromide,iodate can oxidize and decolorize methyl orange very well.The optimum reaction conditions for the spectrophotometric determination of a trace amount of iodine were found.The maxium absorbance is at 508 nm,and the linear range is 0～50 μg/(50 mL).The apparent molar absorptivity is 3.13×10~4 L/(mol·cm).The method has been used in the determination of iodine in foods with satisfactory results.

Key concepts: Chemistry, Molar absorptivity, Iodine, Potassium iodate, Absorbance, Iodate, Methyl orange, Potassium bromide

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