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DETERMINATION OF TRACE IODINE IN SALT BASED ON CRYSTAL VIOLET-SODIUM ARSENITE SPECTROPHOTOMETRIC SYSTEM

Wei Wu

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Abstract

A new spectrophotometric method for the determination of trace amount of iodine was proposed. The sodium arsenite reacts with potassium iodide in acidic solution, giving rise to I3- that can oxidize crystal violet selectively. The absorbance at 463 nm increased proportionally to the amount of potassium iodide. A good linearity was observed over the potassium iodide concentration range 6 mg/L ～20 mg/L with a linear coefficient of 0.995 8. The detection limit of the method is 0.068 6 mg/L. The method was used for the determination of trace amount of iodine in salt with the recovery from 96.0 % to 101.0 %.

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A new spectrophotometric method for the determination of trace amount of iodine was proposed. The sodium arsenite reacts with potassium iodide in acidic solution, giving rise to I3- that can oxidize crystal violet selectively. The absorbance at 463 nm increased proportionally to the amount of potassium iodide. A good linearity was observed over the potassium iodide concentration range 6 mg/L ～20 mg/L with a linear coefficient of 0.995 8. The detection limit of the method is 0.068 6 mg/L. The method was used for the determination of trace amount of iodine in salt with the recovery from 96.0 % to 101.0 %.

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Available abstract

A new spectrophotometric method for the determination of trace amount of iodine was proposed. The sodium arsenite reacts with potassium iodide in acidic solution, giving rise to I3- that can oxidize crystal violet selectively. The absorbance at 463 nm increased proportionally to the amount of potassium iodide. A good linearity was observed over the potassium iodide concentration range 6 mg/L ～20 mg/L with a linear coefficient of 0.995 8. The detection limit of the method is 0.068 6 mg/L. The method was used for the determination of trace amount of iodine in salt with the recovery from 96.0 % to 101.0 %.

Key concepts: Iodine, Crystal violet, Chemistry, Absorbance, Detection limit, Iodide, Arsenite, Sodium arsenite

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DETERMINATION OF TRACE IODINE IN SALT BASED ON CRYSTAL VIOLET-SODIUM ARSENITE SPECTROPHOTOMETRIC SYSTEM — Research Paper | ScholarLens