Abstract
A direct EDTA titration method for mercury(II) ions with o-(2-thiazolylazo)-cresol (TAC) as the metallochromic indicator at pH 7–8.3 is described. Sharp color changes from blue to yellow or red indicate the equivalence point. The indicator transition of TAC is discussed theoretically by using the formation constants of the mercury (II)-TAC chelate; the results obtained were confirmed experimentally by photometric titration.
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