Abstract
A method of radiometric titration for the determination of trace amounts of metals has been developed. The EDTA complex of the metal to be determined is formed, and the excess, uncomplexed metal ions are removed by means of a cationic exchanger. A titration curve is then constructed by plotting the activity of the liquid phase, vs. the amount of EDTA added. Both the batch and column method were tried in this laboratory, and it is our opinion that the batch method is easier from a manipulative point of view. A new method of determining the end point was developed. If both the resin and solution are counted, this is a simple way of determining the half equivalent point. Methods are underway to maximize the sensitivity for zinc by chelating radiometric titration.
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