COMPOSITION OF ELECTRODE MEMBRANE FOR POTENTIOMETRIC DETERMINING OF CONCENTRATIONS OF COPPER AND ARSENIC(iii) IONS IN SOLUTION Russian patent published in 1994 - IPC

FIELD: analytic chemistry. SUBSTANCE: invention provides a widened operating range of an electrode with regard to copper ions up to 1·10^-6 моль/л and with regard to arsenic ions up to (5.0-9.1)·10^-1-(5.0-9.1)·10^-7 моль/л and enhanced chemical stability in acidic media due to using a membrane of the following composition in wt.%: As₂C₃:CuS(33.5-50.0): (50.0-66.5). EFFECT: widened operating range and enhanced chemical stability. 4 dwg