Analysis by release of radioactivity by inorganic ion-exchange and ring oven technique-I Determination of copper.
A sparingly soluble inorganic compound, fixed as a spot on filter paper, is used as an ion-exchanger in which the exchangeable ions are labelled with a radioactive isotope. These ions are replaced by the ions of the element to be determined but not by other accompanying ions. In this exchange an equivalent amount of the radioactive labelled ions is released from the ion-exchanger and separated from the spot by the ring oven technique. The activity of the ring is measured and compared with that of a standard processed in the same way. The determination of copper in amounts greater than 25 ng in the presence of a similar amount of lead and considerably greater amounts of cobalt, nickel, zinc, manganese and thallium is described.
Kriván
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Chemical Laboratory of the University Freiburg i. Br., Department of Analytical Chemistry, German Federal Republic.