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2011•Journal of Instrumental AnalysisRequires access

Determination of Iodine Content in Infant Formula Cereals by Ion Chromatography

Xie Zong-liang

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Abstract

An ion chromatographic method in combination with pulsed amperometric detection was developed for the analysis of added iodide and iodate in infant formula cereal products.The protein removal mode and the amount of protein precipitant were studied.The opitimun conditions for ultrasonic extraction were explored and the dosage of reductant for iodate to iodide was investigated.Under the optimum conditions,the method showed good linearity in the range of 1-100 μg/L for iodide and iodate with correlation coefficients of 0.999 1 and 0.999 9,respectively.The quantitation limits were 5.2 ng/g and 9.0 ng/g,respectively.The spiked recoveries for iodide and iodate were in the range of 74%-100% and 75%-100%,respectively,with RSDs of 4.4%-6.7% and 5.0%-6.9%,respectively.

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What this paper is about

An ion chromatographic method in combination with pulsed amperometric detection was developed for the analysis of added iodide and iodate in infant formula cereal products.The protein removal mode and the amount of protein precipitant were studied.The opitimun conditions for ultrasonic extraction were explored and the dosage of reductant for iodate to iodide was investigated.Under the optimum conditions,the method showed good linearity in the range of 1-100 μg/L for iodide and iodate with correlation coefficients of 0.999 1 and 0.999 9,respectively.The quantitation limits were 5.2 ng/g and 9.0 ng/g,respectively.The spiked recoveries for iodide and iodate were in the range of 74%-100% and 75%-100%,respectively,with RSDs of 4.4%-6.7% and 5.0%-6.9%,respectively.

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Available abstract

An ion chromatographic method in combination with pulsed amperometric detection was developed for the analysis of added iodide and iodate in infant formula cereal products.The protein removal mode and the amount of protein precipitant were studied.The opitimun conditions for ultrasonic extraction were explored and the dosage of reductant for iodate to iodide was investigated.Under the optimum conditions,the method showed good linearity in the range of 1-100 μg/L for iodide and iodate with correlation coefficients of 0.999 1 and 0.999 9,respectively.The quantitation limits were 5.2 ng/g and 9.0 ng/g,respectively.The spiked recoveries for iodide and iodate were in the range of 74%-100% and 75%-100%,respectively,with RSDs of 4.4%-6.7% and 5.0%-6.9%,respectively.

Key concepts: Iodate, Chemistry, Iodide, Iodine, Chromatography, Ion chromatography, Infant formula, Amperometry

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