INVESTIGATION OF THE IC-ICP-MS DETERMINATION OF IODINE SPECIES WITH REFERENCE TO SAMPLE DIGESTION PROCEDURES

The determination of iodine in aqueous solutions suffers from several serious problems, caused by the formation of iodine species, derived f rom the oxidative pretreatment of biological materials. For the determ ination of these iodine species an ion chromatograph was coupled with an ICP-mass spectrometer. Because of the possible interconversion of t he iodine species depending on the pH-value, different eluent-column c ombinations were used for acidic or alkaline sample solutions, respect ively. Iodide, iodate, and several not identified, presumably organo-i odine species could be separated and detected. Unfortunately, the iodi ne (I-2) itself could not be determined with the method proposed. The reaction products of pretreatment are influenced strongly by the matri x. Mixtures of different iodine containing components are received, de pendent on the matrix composition and particularly on the pH-value.