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Polarographic investigations on complexes of cadmium and lead with adipic acid have been carried out. The present study includes the effects of various parameters such as mercury pressure, temperature, concentration of metal ion, concentration of ligand, pH, surface active substances and viscosity on the waves. The plot of — E1/2 vs SCE and — log Cx is a curve (Fig. 2) showing the formation of more than one complex. The value of F3(X) is found to be constant (Table 1) which proves that three complexes are formed. Their overall stability constants have been calculated by using DEFORD and HUME'S method [2] and the values habe been found to be β1 = 16.5, β2 = 48.5, β3 = 116 ± 2. Along with this, effect of pH on pK1 (4.43) and pK2 (5.28) of adipic acid has also been investigated. The present work is also an attempt to describe the mechanism of the electrode process involved therein.

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A rapid amperometric method for the determination of vanadium (V) has been described which involves titration of vanadium (V) as sodium orthovanadate against copper sulphate solution at Ede = − 0.20 V (vs S.C.E.). The accuracy and reproducability of the method is excellent particularly at higher temperature i.e. at 60°C. The method permits the determination of vanadium (V) down to 0.2 mM with an accuracy 1.0%).