Abstract
Abstract The conditions for the determination of sodium thiophosphate and sodium S-(2-amino-ethyl)-thiophos-phate in the presence of phosphate ion using ion-selective membrane electrodes are described. Both thiophosphates (inorganic and organic) are hydrolyzed in acidic medium. The phosphate ion is determined with Pb(II) using a Pb2+ – selective membrane electrode. Cysteamine is determined by potentiometric titration with Hg(I1) using a Ag+/S2− – crystal membrane electrode or by direct potentiometry with a Cu2+ selective membrane electrode. The results were verified by the iodination method.
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