Potentiometeric studies have been carried out on 1:1 ML mononuclear complexes, where Ca (II), Fe (III) and Zn (II) represent the essential metals whereas Pb (II), Cr (III, VI) and Ni (II) are the biotoxic metal ions. The ligands selected are the polyamino carboxylic acida(PAC)such as EDTA, DTPA and CDTA. pH titrations were performed in aqueous solutions at an ionic strength of 0.l M and temperature 30°C. Formation of above mentioned metal-PAC complexes were studied and compared. DTPA was found comparatively a strong acid among the three PAC acids and suitable for complexation especially at the pH below 2.5 contrarily to CDT A and EDTA.
S GULZAR ,Z T MAQSOOD ,N FATIMA ,
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