Extraction of Vanadium(V) with Hydroxyamidine in the Presence of Adductants and its Spectrophotometric Determination with Diphenylcarbazide

The extraction of V(V) with N-hydroxy-N,N'-diphenylbenzamidine(HOA) in the presence of 100 adduct-forming substances, e.g. inorganic acids, carboxylic acids, phenols, aldehydes and amides from weakly acidic solution into chloroform has been studied. The molar absorptivities of the resultant adducts lie in the range of (1.5-7.8) × 103 lmol−1 cm−1 at λmax 575–635 nm. The most sensitive adductant, 4-nitro-phenol(NPhOH) has been chosen for detailed …