Metal Ion Buffer Systems for Ionometry in Water-Ethanol Mixtures and Micellar Medium of Sodium Dodecyl Sulfate

Abstract

The concentration dissociation constants of nitrilotriacetic acid and the concentration stability constants of Cd(II) complexes with the nitrilotriacetic acid anion in water3ethanol mixtures and of Cu(II) and Cd(II) complexes with o-phenanthroline and 2,2`-bipyridine in micellar solutions of sodium dodecyl sulfate were determined potentiometrically. Based on the concentration constants determined, Cd 2+ and Cu 2+ buffer solutions were developed for calibration of a Cd 2+ -selective electrode in water3ethanol mixtures and Cd 2+ and Cu 2+ -selective electrodes in micellar solutions of sodium dodecyl sulfate within the ranges pCu 9.7313.5 and pCd 7.5311.8.