Abstract
A new spectrophotometric method for the determination of zinc is proposed. The chromogenic agent Hydrazidazol forms a 1:1 chelate with zinc in the presence of Triton X-100 in a medium containing 20–40% ethanol. The molar absorptivity and conditional formation constant have been found to be 2.7 × 1O 4 l.mole −1.cm −1 (at 640 nm) and 10 5.32 respectively. Beer's law is obeyed for zinc over the range of 0.2–0.8 μg/ml with a standard deviation of 0.024 μg/ml. The method can be applied to the determination of zinc in cadmium metal and its oxide after preconcentration by selective extraction of zinc thiocyanate into ethyl acetate in the presence of EDTA and thiosulphate as masking agents.
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