A simple and rapid derivative spectrophotometric method
has been developed for the simultaneous analysis of Bi(III)
and Zn(II) in synthetic mixtures and real samples by applying
HDz in acetone/n-propanol (1/1, v/v) mixture as reagent at a
pH of 5.0 adjusted by sodium hydroxide. The method does not
require solvent extraction conventionally used in dithizone