title: Determination of iodine in milk and oyster tissue samples using combustion and peroxydisulfate oxidation.
abstract: Two methods are described for the preparation of samples for total iodine measurement in biological matrices. In the first method, the samples were combusted in a stream of oxygen to release iodine that, subsequently, was trapped in a solution as iodide. The second method is a new approach in which the samples were oxidized in a basic solution of peroxydisulfate. In this case, the iodine was retained in solution as iodate. Total iodine was measured by gas chromatographic analysis of the 2-iodopentan-3-one derivative. The methods were tested using Standard Reference Materials (SRMs) 1549 Non-Fat Milk Powder, and 1566a and 1566 Oyster Tissue. Also, KI and KIO3 were used for testing the procedures. The results obtained for the SRMs, given as average +/- standard deviation in micrograms g-1, were: 3.39 +/- 0.14 and 3.40 +/- 0.23 for SRM 1549; 4.60 +/- 0.42 and 4.51 +/- 0.45 for SRM 1566a; and 2.84 +/- 0.16 and 2.76 +/- 0.06 for SRM 1566; values corresponding to combustion and wet oxidation, respectively. Overall, the absolute recoveries varied between 91 and 103%. These methods can also be used in the preparation of targets for the measurement of 129I using accelerator mass spectrometry.
authors.affiliation: Shanghai Institute of Radiation Medicine, China.
authors.forename: F
authors.initials: F
authors.lastname: Gu
authors.forename: A A
authors.initials: AA
authors.lastname: Marchetti
authors.forename: T
authors.initials: T
authors.lastname: Straume
mesh_terms: D000818:Animals; D002849:Chromatography, Gas; D006358:Hot Temperature; D007455:Iodine / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D010125:Ostreidae / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D007455:Iodine