Chelate-exchange titrimetry in nonaqueous solvents. I. Determination of dithizone and metal dithizonates

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Abstract
A new spectrophotometric titration method is proposed for determination of the amounts of metal chelates present in nonaqueous solvents. The titrant is a standard solution of a chelating agent which quantitatively displaces the chelate anion of the metal chelate. The method is exemplified by the titration of μg amounts of the dithizonates of Ag, Pb, Cu(II), Cd, Zn, and In in chloroform, both in the absence and the presence of free dithizone. Some binary and ternary mixtures were also successfully analyzed for the individual metal dithizonates. The titrant was a standard solution of sodium diethyldithiocarbamate in ethanol. Precision and accuracy were good. The preparation and analysis of the metal dithizonates are described. New titrimetric procedures are also proposed and shown to be satisfactory for determination of the free dithizone content of a chloroform solution.

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