Studies on the electrochemical behavior of 2‐(3,5‐dibromo‐2‐pyridyl)azo‐5‐diethylaminophenol‐co(II) complex in the presence of nitrite: Trace, measurements of cobalt

Abstract

Abstract In an acetate acid buffer solution (pH = 4.5) containing 2‐(3,5‐dibromo‐2‐pridyl)azo‐5‐diethylaminophenol or 3,5‐2Br‐PADAP and nitrite, there is a catalytic single‐sweep polarographic peak that is very sensitive and selective to cobalt(II). The linear range is from 1 × 10 −10 M to 1 × 10 −6 M, with a detection limit of 5 × 10 −11 M. Most common cations and anions do not interfere with the determination. The method has been used or the determination of trace cobalt in human hair and pure nickel nitrate samples. The mechanism involved has been investigated by various electrochemical methods, and the catalytic process is magnified image .