Abstract
A fundamental study has been made for determination of gold, silver, copper, platinum, palladium, bismuth, cadmium, etc., by the extraction of them with dithizone-benzene solution followed by the spectrophotometric measurement.
Metals were extracted by shaking with 10 ml of 0.01% dithizone-benzene for 1 min. and the ranges of pH and concentration of sulfuric acid for 100% extraction have been determined.
The excess of dithizone was washed off by a dilute solution of alkali and absorption spectra and molecular extinction coefficients of complexes in benzene solution were obtained. Benzene showed a higher extractability of the complexes in comparison with chloroform or carbon tetrachloride. The whole operations including the extraction of complex and the removal of excess reagent were done simply in a separatory funnel.
