Spectral Correlation Technique for Determination of Property Constants of Cadmium Complex with o-Nitrobenzenediazoaminoazobenzene and Determination of Trace Amounts of Cadmium

Abstract

The ligand, o-nitrobenzenediazoaminoazobenzene (o-NBDA)
was synthesised and its reaction with cadmium(II) was sensitive in
basic solution in presence of the non-ionic surfactant emulsifier OP.
Because of the serious influence of excess of the ligand, the spectral
correction technique was used in place of ordinary
spectrophotometry. This method gave the simple determination of
property constants of the Cd-o-NBDA complex and the results
showed the complex was Cd(o-NBDA)₄, its real molar absorptivity
ε^480nm = 1.02 x 10⁵ L  mol^-1 cm^-1 and its cumulative stability constant
K = 2.15 X 10²³. For analysis of samples, the recovery was
between 91.0 and 08.5% and the relative standard deviation (RSD)
is less than 6%.