Abstract
Spectrophotometric determination of copper with thiomalic acid was investigated.
Thiomalic acid reacts with copper to form a water-soluble reddish violet complex with an absorption maximum at 530 mμ.
Fundamental conditions for the determination were studied, the optimum conditions being 10 ml of 0.6% thiomalic acid solution per 100 ml of total solution containing 1% hydrazine sulfate, pH 5.5, and the wavelength 530 mμ.
The Beer's law obeyed over the range of 1 to 30 ppm Cu, and the molar extinction coefficient was 1.27 × 103.
The mole ratio of Cu to thiomalic acid was proved to be 1 : 1 both by continuous variation method and by mole ratio method.
The influence of Ni2+, Co2+, Fe3+ etc. was examined.
