A new modification of the substoicheiometric isotopic-dilution method is presented. After the addition of a standard amount of labelled compound, the isotopically diluted compound is then isolated, as a residue of constant weight, and the beta activity measured. The method applied to the determination of sulphate and carbonate is applicable in the range 10 to 100 µg for these anions.
J. K. Johannesson, Analyst, 1967, 92, 766 DOI: 10.1039/AN9679200766
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