Spectrophotometric determination of titanium as tetraphenylarsonium or tetraphenylphosphonium thiocyanato-titanate |
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Authors: | B. Tamhina V. Maul M.J. Herak |
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Affiliation: | Laboratory of Analytical Chemistry, Faculty of Science, The University of Zagreb, Strossmayerov trg 14, 41000 Zagreb, Yugoslavia |
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Abstract: | The spectrophotometric determination of titanium(IV) with thiocyanate by extraction of the tetraphenylarsonium and tetraphenylphosphonium ion-association complexes is described. The extracted complexes in chloroform have a maximum absorbance at 420 nm, obey Beer's law in the range 0.1–1 μg Ti ml?1, and are stable for at least 5 hr. The molar absorptivity of the method is 7.5 × 104 liters mol?1 cm?1. The described method is sensitive, selective, and reproducible. The composition of the extracted complexes was studied in solution and in solid state. The complexes [(C6H5)4X]2 [Ti(NCS)6] (X = As, P) were isolated from the chloroform solution. |
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