Spectrophotometric Studies on the equilibria of vanadium(V)-4-(2-Pyridylazo)-resorcinol-polyaminopolycarboxylate systems |
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| Authors: | Jun-ichi Itoh Takao Yotsuyanagi Kazuo Aomura |
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| Institution: | Laboratory of Analytical Chemistry Faculty of Engineering, Hokkaido University. Sapporo 060 Japan |
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| Abstract: | The complexation equilibria in the VO+2-PAR-polyaminopolycarboxylate-(EDTA and CDTA) systems were studied spectrophotometrically in order to establish the action of CDTA in the spectrophotometric determination of vanadium(V) with PAR. Analysis of absorbance-pH curve and ligand exchange equilibria yielded the following values of the constants; KVO2HR=lO17.16, KHVO2HR=10-3.95, KVO2R=1018.81, KVO2EDTA=1017.38 and KVO2CDTA=1016.59 at 20°C and ionic strength 0.1 (KCl). Based on these constants, the selective masking behavior of CDTA for the VO+2-PAR system can be quantitatively explained. |
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