Spectrophotometric determination of vanadium(V) as a mixed thiocyanate-4-pyridone complex |
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Authors: | B Tamhina V Vojković MJ Herak |
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Institution: | Laboratory of Analytical Chemistry, Faculty of Natural Sciences and Mathematics, University of Zagreb, Strossmayerov trg 14, 41000 Zagreb, Yugoslavia |
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Abstract: | The spectrophotometric determination of vanadium(V) as a mixed thiocyanate-3-hydroxy-2-methyl-1-phenyl-4-pyridone (HX) complex and as a mixed thiocyanate-3-hydroxy-2-methyl-1-(4-tolyl)-4-pyridone (HY) complex is described. The extracted complexes in chloroform have a maximum absorbance at 450 and 650 nm. The optimal conditions for the extraction and spectrophotometric determination of vanadium(V) are determined. The solutions of the V-SCN-HX and V-SCN-HY complexes in chloroform obey Beer's law in the range 1–10 ppm of vanadium, and are stable for at least 24 hr. The molar absorptivity of the method is 6.8 × 103 liters mol?1 cm?1. The molar ratio V:SCN:HX (HY) of the extracted complex is 1:1:2. |
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