Analysis of Cadmium Chelate Solution with Various Ligands

Abstract

Cadmium complex's stoichiometric ratio has been determined with the

following ligands, eriochrome black T (EBT), ammonium purpurate (AP),

acid chrome blue K (ACBK) and calcium carboxylic acid (CCA), by the

updated β-correction spectrophotometry, which is more acceptable and

more simple than one of other usual methods, for example molar ratio.

etc. With this principle, the complex practical molar absorptivity has been

first calculated, which is higher than its apparent one at its maximum

absorption wavelength. The results show that the complex ratios are:

Cd/EBT = 1/2, Cd/AP = 1/4, Cd/ACBK = 1/2 and Cd/CCA = 1/1, and the

practical molar adsorptivity: ε_{520 nm} = 2.72 x 10⁴ L mol^–1 cm^–1 (Cd-EBT

chelate), ε_{10 nm} = 2.74 x 10⁴ (Cd-AP chelate), ε_{510 nm} = 3.74 x 10⁴ (Cd-

ACBK chelate) and ε_{550 nm} = 0.77 X 10⁴ (Cd-CCA chelate).