Abstract
The principle of back-titration with EDTA is applied to rapid radiometric methods. A suitable vessel for performing the reaction, filtration and count-rate measurement is described. The optimal conditions for the use of solid 110mAgIO 3 as indicator were studied: the time for solubility-equilibrium of solid silver iodate, the reaction time of EDTA with silver iodate, and the pH-dependence of the silver-EDTA reaction rate. Procedures are given for calibration curves and for rapid radiometric determinations of copper(II). nickel(II), lead(II) and zinc(II). The method is suitable for the range 1–100μg.
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