Journal article Open Access

Ionophoretic studies on mixed complexes : Metal-acetic acid-nitrilotriacetate

V. K. Nigam; P. Kumar; P. P. Singh; R. K. P. Singh

Electrochemical Laboratory of Green Synthesis, Department of Chemistry, University of

Allahabad, Allahabad-211 002, Uttar Pradesh, India

E-mail : rkp.singh@rediffmail.com

Manuscript received online 11 July 2012, revised 09 August 2012, accepted 10 August 2012

Quantitative indication of a complex formation comes from the estimation of the stability or formation constants characterizing the equilibria corresponding to the successive addition of ligands. The binary equilibria of metal ions, viz. FeIII, CuII, NiII and CoII-acetic acid and also mixed equilibria FeIII/CuII/NiII/CoII-acetic acid-NTA (nitrilotriacetic acid) have been studied using ionophoretic technique. The stability constants of metal-acetic acid binary complexes are found to be 4.42, 3.58, 3.42 and 3.37 that of metal-acetic acid-NTA mixed complexes have been found to be 6.34, 6.31, 6.14 and 6.11 for FeIII, CuII, NiII and CoII complexes, respectively at 25 °C and ionic strength µ = 0.1 mol dm-3 (HCIO4).

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