An analytical method for dete~mining'~~1 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 lz91. Iodine, as iodide, is concentrated by sorption on an anion exchange column and eluted with NaOCI. After reduction to I,, the iodine is extracted into CCI,, back extracted into water, cleaned by one toluene-water extraction cycle, and finally extracted into toluene. Chemical recovery of the added carrier is determined spectrophotornetrically on a small aliquot of the toluene extract. The 12g1 concentration is determined by liquid scintillation counting of the toluene solution.Average per cent recovery of iodine carrier is 74 f 2 for water, 58 =k 3 for raw milk and 80 4 for pasteurized milk. Analytical sensitivity is 0.3 pCi lZ0I/1. for a 4-1. sample.

No abstract

No abstract

No abstract