Control of radiochemical purity of sodium oxalate-14C preparations

A rapid method of radiochemical purity control of sodium oxalate-14C on Whatman ET-81 chromatography paper by developing with 0.125 M sodium chloride is elaborated. During the 2.5 hr developing-time the solvent front reaches 20 cm. Rsub(F) values of carbonate and propionate expected as radiochemical impurities are respectively 0.60 and 0.82; Rsub(F) value of oxalate is 0.42. It has been found that the sodium oxalate-14C preparations after dissolving in water decompose very slowly and they can be analysed even 3 days after dissolving. Accuracy of the determination of oxalate ranging from 75-100% is 0.9%, carbonate in quantities to 5% is 0.4% and propionate in quantities to 25% is 0.9%. (author)