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A Method for Determining Iodine-129 in Milk and Water
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1974
Year
Solvent ExtractionEngineeringFood AnalysisFood ContaminantChemistryPrecision DairyChemical ContaminantFood ChemistryEnvironmental ChemistryChemical EngineeringIodine CarrierEnvironmental Analytical ChemistryIodine Deficiency DisordersBioanalysisWater TreatmentAnalytical ChemistryFood SciencesChromatographyHealth SciencesEnvironmental MilkWater QualityElemental Iodine SeparationFood QualityChromatographic AnalysisFood SafetyWater PurificationDrug Analysis
An analytical method for determining 129I in environmental milk and water samples is described. The method depends on the specificity of elemental iodine separation by solvent extraction, followed by liquid scintillation counting of the low-energy beta emissions from 129I, Iodine, as iodide, is concentrated by sorption on an anion exchange column and eluted with NaOCl. After reduction to I2, the iodine is extracted into CCl4, back extracted into water, cleaned by one toluene-water extraction cycle, and finally extracted into toluene. Chemical recovery of the added carrier is determined spectrophotometrically on a small aliquot of the toluene extract. The 129I concentration is determined by liquid scintillation counting of the toluene solution. Average per cent recovery of iodine carrier is 74 ± 2 for water, 58 ± 3 for raw milk and 80 ± 4 for pasteurized milk. Analytical sensitivity is 0.3 pCi 129I/l. for a 4-l. sample.