Molecular iodine selective membrane for iodate determination in salt samples: chemical amplification and preconcentration

Analytical and Bioanalytical Chemistry
P R BhagatA V R Reddy

Abstract

A molecular iodine selective membrane has been used for preconcentration of I(2) generated in situ by iodometric reaction of IO(3)(-) with excess I(-) in acidic medium (pH 1-2). This iodometric reaction amplifies the iodine content six times resulting in enhancement of analytical response ranging from three times for molecular methods to six times for elemental methods. The chemical conditions of this iodometric reaction were optimized for quantitative generation and subsequent sorption of I(2) in the membrane samples (96 +/- 3%). The homogeneous transparent membrane was prepared by immobilizing I(2)-complexing polyvinylpyrrolidone (PVP) in the plasticized cellulose triacetate matrix. Four different analytical methods were examined for quantitative determination of IO(3)(-) in iodized salt samples by preconcentrating it as I(2) in the membrane matrix. These methods were: (1) spectrophotometry of the PVP-I(2) complex formed in the membrane matrix, (2) a radiotracer method using I(-) tagged with (131)I radiotracer, (3) instrumental neutron activation analysis (INAA), and (4) energy-dispersive X-ray fluorescence (EDXRF) analysis. The IO(3)(-) contents thus determined in the iodized salt samples by the membrane-based radiotracer me...Continue Reading

References

Dec 1, 1979·Journal of Pharmaceutical Sciences·H U SchenckE Haedicke
Aug 29, 2007·Analytica Chimica Acta·Francisco C PereiraPaolo Ugo

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Citations

Jan 13, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Azadeh AzadbakhtShiba Amraei

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