MULTICOMPONENT ANALYSIS OF SODIUM CUPRATE, NACUO2-X, HAVING A HIGH CU(III) CONTENT

Sodium cuprate with a high Cu(III) content was synthesized and charact erized with emphasis on the determination of Cu(III). Results of multi component analysis, carried out in two independent laboratories employ ing several different methods, are compared and discussed. For Cu(III) determination, improved or newly developed iodometric and voltammetri c methods were used. A good agreement on the high Cu(III) content (97- 98% of total copper) was found. Virtually no peroxidic oxygen was foun d employing a specific photometric procedure. Other components, sodium and total copper, were determined by means of usual methods: inductiv ely coupled plasma atomic emission spectroscopy (ICP-AES), atomic abso rption spectroscopy (AAS), flame emission spectroscopy (FES) and ion s elective electrode (ISE)/potentiometry. This preliminary interlaborato ry characterization study showed that sodium cuprate, synthesized by t he applied method, can be considered as a potential Cu(III) standard r eference material.