الخلاصة

Liquid ion exchange method as sensitive application of solvent extraction in order to separation and determination W(V1) as anion WO4 -2 by use α-Naphthyl amine to formation ion pair association complex, spectrophotometric study shows the wave length for maximum absorbance of ion pair association complex was λmax=289nm, effect of HCl concentration on extraction efficiency of WO-2 demonstrate 0.6M HCL was the optimum concentration of HCL to give higher extraction efficiency in presence 50Mg W(V1)/5ml by using 1x10-4M pnaphthyl amine (α-NPA) dissolved in chloroform. The optimum condition for highest extraction W(V1) as WO4 +2 appear the method of extraction needed shaking time equal to 15 min. the existance of electrolyte in aqueous solution effect to increase the extraction efficiency of W(V1), and this enhancement in extraction efficiency differ with different electrolyte and concentration, thermodynamic study shows extraction method was endothermic and the optimum temperature was 40˚C and thermodynamic data were ∆Hex= 0.1273KJmol-1 ∆Gex= - 67.136 KJmol-1 ∆Sex= 214.898 Jmol-1K-1, stoichiometry shows the more probable structure of ion pair association complex extracted was [H-PNA]+ ; HWO4 - , the study involved also interferences effect. And spectrophotometric Determination.