Abstract
The potentiometric back titration of excess EDTA with mercury(II) was used very successfully for the analysis of zinc pigments and mixtures of zinc oxide with copper phthalocyanine, especially when adulterated. This new method eliminates the use of hydrogen sulfide separation and is thus characterized by simplicity and rapidity; 28 different industrial samples were analyzed, with many advantages over the classical procedures used for analysis of such materials.
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