The Chemical speciation and solution equilibrium study of Terephthalic acid dihydrazide (TPDH) with Ni2+, Cu2+ and Zn2+ ions was carried out using a pH-potentiometric method of data acquisition followed by chemometric modelling methods of analysis. TPDH acts as a ditopic ligand, as two coordinating units present on either side of the benzene ring. Speciation analysis of the metal ion M2+-TPDH systems of different homo nuclear and homo binuclear species was carried out. Several protonated and deprotonated species of the type MmLlHh (m= 1or 2, l=1or 2 and h varies from 2 to -1 depending on m and l) were observed to be present in the solution. The corresponding formation constants (303 K, and 0.01M ionic strength) were calculated with the application of MINIQUAD-75 program. HySS program was used to generate concentration distribution diagrams. The best-fit chemical models were chosen based on statistical parameters like Standard deviation (SD), sum of the residual squares in mass balance equations (U), chi-square test etc.
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