Liquid Ion Exchange for Extraction and Spectrophotometric Determination of Tungestate WO4Ë by Use Azo-derivative.
Abstract
2-[(4–formylphenayl)azo]-4,5-diphenyl imidazole [FPADPI] used as complexation agent to form ion
association complex. pH=8, which is giving higher absorbance at λmax= 460nm , in presence of 50 μgW6+ as
WO4Ëin 5mL and 1×10-4 M of [FPADPI], this study show ion pair complex extracted have a structure 1:1
[H-FPADPI]+;HWO4
-or [2H-FPADPI]2+;WO4Ë, and thermodynamic study show extraction method of
WO4Ë was endothermic with thermodynamic data ΔHex=0.0287 K J mol-1, ΔGex=-50.83 K Jmol-1 and
ΔSex= 167.857 J mol-1K-1as well as this research contain another studies.
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