Analytical Application of Catalytic Polarographic Current of Nickel(II) in Acidified Thiocyanate Solutions Containing Cobalt(II)

Abstract

Abstract Simple and sensitive methods have been developed for the determination of nickel(II), based on the catalytic polarographic current in acidic thiocyanate solution in the presence and absence of cobalt(II). The basis of the methods and the effect of variables have been investigated and elucidated. In the absence of cobalt(II), thiocyanate solution containing large amounts of hydrogen ions serves a supporting electrolyte, while an acidic thiocyanate solution containing tetra-n-butylammonium salts is suitable for the determination of nickel(II) in the presence of cobalt(II). These methods are applicable to the determination 2×10−6 M nickel(II) in the presence and absence of 1×103 M cobalt(II).