The Extraction of the Tungsten(VI)–Pyrocatechol Violet Complex with Tridodecylethylammonium Bromide

The extraction equilibria and the fundamental conditions were studied for extracting the tungsten(VI)–Pyrocatechol Violet complex anion in a form of an ionic associate with tridodecylethylammonium salt in carbon tetrachloride. The ternary complex has an absorption maxima at 575 nm in the organic phase. The optimum pH range for the extraction is 4.8–5.6. The distribution ratio and the molar absorptivity are 3.3×102 and 4.7×104 dm3 mol−1 cm−1 respectively. The composition of the ternary complex is estimated to be WO2(PV)2(R3R′N)2.The extraction constant would be:Kex=\frac[WO2(PV)2(R3R′N)2]o[WO2(PV)22−][R3R′N+]2.It is given by logKex=13.56. Many foreign cations can be masked with CyDTA.

[1]  K. Ueda.  The Extraction Spectrophotometric Determination of Cobalt(II) with 4-(2-Thiazolylazo)resorcinol and Zephiramin , 1979 .

[2]  S. Motomizu,et al.  Extraction—spectrophotometric determination of trace amounts of iron in waters with pyrogallol red and zephiramine , 1979 .

[3]  K. S. Patel,et al.  Extraction-Spectrophotometric Determination of Vanadium(V) Employing N1-Hydroxy-N1,N2-diarylbenzamidines and Various Adduct-forming Substances , 1979 .

[4]  昌二 本水,et al.  2-ニトロソ-1-ナフトール-4-スルホン酸と第4級アンモニウム塩を用いる銅の抽出-吸光光度定量法 , 1978 .

[5]  M. Subramanian,et al.  Extractive photometric determination of plutonium(IV) with Aliquat-336 and xylenol orange , 1978 .

[6]  Y. Shijo.  The analytical application of oleophilic quaternary ammonium salts. XI. The extraction of the iron(III)-pyrocatechol violet-tridodecylethylammonium ternary complex. , 1977 .

[7]  Y. Shijo.  Spectrophotometric Study of the Zirconium–Pyrocatechol Violet–Tridodecylethylammonium Ternary Complex , 1976 .

[8]  S. Arya,et al.  The spectrophotometric determination of vanadium after extraction as vanadium(III) ferronate by tribenzylamine , 1976 .

[9]  J. Adam,et al.  Extraction with long-chain amines-X Complexometric determination of titanium after extraction of its ascorbate complexes. , 1975, Talanta: The International Journal of Pure and Applied Analytical Chemistry.

[10]  S. Arya,et al.  Extraction of bivalent vanadium as its pyridine thiocyanate complex and separation from uranium, titanium, chromium and aluminium. , 1975, Talanta.

[11]  A. M. Nardillo,et al.  A study of vanadium(IV)-3-methylcatechol-quaternary ammonium systems , 1975 .

[12]  D. Singh,et al.  Extraction of zinc thiocyanate complexes by high molecular weight amines and quaternary ammonium salt , 1974 .

[13]  Y. Shijo.  The Solvent Extraction of the Copper–Pyrocatechol Violet Chelate with Tridodecylethylammonium Bromide , 1974 .

[14]  R. S. Ramakrishna,et al.  Pyridine adduct of vanadyl thiosalicylate: Isolation, characterization and analytical application including a study of similar complexes of possible interfering cations , 1974 .

[15]  Yoshinobu Wakamatsu,et al.  The Extraction and Spectrophotometric Determination of Vanadium(IV) with Tiron , 1974 .