Long-lived iodine signals were achieved from 100 ng of iodine. ![]() A single-color, two-photon resonant plus one-photon ionization scheme was used to form positive iodine ions. The analyte was dried as silver ammonium iodide upon a tantalum filament from which iodine was thermally desorbed in the resonance ionization mass spectrometry instrument. ![]() Samples were equilibrated with the 129I, wet ashed under controlled conditions, and iodine separated by coprecipitation with silver chloride. The long-lived radioisotope, 129I, was used to spike the samples. ![]() The technique of laser resonance ionization mass spectrometry has been combined with isotope dilution analysis to determine iodine in oyster tissue.
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