Ananlysis of Nickel Chelate solution with m-Chloroazo-antipyrine and Determination of Trace Amounts of Nickel in Wastewater

Abstract

The chelate of Ni with m-chloroazoantipyrine (CAA) has been studied.

Its characteristic factors were analysed for example, instability constant,

complexation ratio and practical molar absorptivity. The new usage of

β-correction principle has been built here. By means of the disscused

ligand, the determination of trace amounts of nickel has been improved at

pH 6. Results showed that Ni/CAA = 1:2 in their chelate, its practical

molar absorptivity was equal to 3.52 x 10⁴ L. mol^–1 cm^–1 at 630 nm and

its total instability constant to 3.62 x 10^–12 at pH 6 and 32ºC with ions

strength equal to 0.1. The analysis to wastewater show that the recovery

of Ni was between 92.0 and 111 % and the relative standard deviations less

than 3.8%.