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Liquid Ion Exchange for Extraction and Spectrophotometric Determination of Tungestate WO4˭ by Use Azo-derivative

Authors: Shawket K. Jawad --- Nadia M. Muslim
Journal: Journals kufa for chamical مجلة الكوفة للكيمياء ISSN: 20772351 Year: 2015 Issue: 10 Pages: 8-20
Publisher: University of Kufa جامعة الكوفة

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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 WO4˭in 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+;WO4˭, and thermodynamic study show extraction method of WO4˭ was endothermic with thermodynamic data ∆Hex=0.0287 K J mol-1, ∆Gex=-50.83 K Jmol-1and ∆Sex= 167.857 J mol-1K-1as well as this research contain another studies.

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