Abstract
Abstract N- Hydroxy- N -m-tolyl-N'-(2-methyl-5-chloro) phenyl-p-toluamidine hydrochloride (HTMCPTH) has been used as a new and convenient extraction system for vanadium(V) in the presence of all organic compounds containing -COOH, -CHO, -OH (phenolic) groups, and also in SCN− and N3 − media. HTMCPTH reacts with vanadium(V) to give a 1:2 complex (having a flat peak in the region 550–590 nm with 750 l/mole/cm). In the presence of various adduct-forming substances, a quantitative recovery of metal and marked absorbance enhancement into chloroform have been observed on the basis of formation and hyper- and bathochromic shift of the hydrophobic species formed. The extracting species is found to be 1:2:1 (V: HTMCPTH: RCOOH/ ArCOOH/ArOH/ArCHO) and 1:2:2 (V: HTMCPTH: SCN−/N3 −) mixed complexes. The nature of adduct-forming substances has a large effect on absorbance and the λmax of mixed complexes. The effective molar absorbances lie between 3500 to 8000 l/mole/cm. Fe3 +, Cu2 +, Zn2 +, Ni2 +, Co2 +, Mn2 +, Al3 +,...
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