Differential determination of tellurium(IV) and tellurium(VI) by atomic absorption spectrophotometry after hydride generation. Combined use of titanium(III) chloride as a prereductant and sodium borohydride solution.

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  • Jin Kazuo
    Department of Chemistry, Faculty of Science, Hokkaido University
  • Taga Mitsuhiko
    Department of Chemistry, Faculty of Science, Hokkaido University
  • Yoshida Hitoshi
    Department of Chemistry, Faculty of Science, Hokkaido University
  • Hikime Seiichiro
    Department of Chemistry, Faculty of Science, Hokkaido University

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  • Differential Determination of Tellurium(IV) and Telluriiim(VI) by Atomic Absorption Spectrophotometry after Hydride Generation. Combined Use of Titanium(III) Chloride as a Prereductant and Sodium Borohydride Solution
  • ChemInform Abstract: DIFFERENTIAL DETERMINATION OF TELLURIUM(IV) AND TELLURIUM(VI) BY ATOMIC ABSORPTION SPECTROPHOTOMETRY AFTER HYDRIDE GENERATION. COMBINED USE OF TITANIUM(III) CHLORIDE AS A PREREDUCTANT AND SODIUM BOROHYDRIDE SOLUTION

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Sensitive determination of tellurium was investigated by atomic absorption spectrophotometry after hydride generation and differential determination of tellurium(IV) and tellurium(VI) in acidic solution was carried out. When sodium borohydride solution is used without any prereductant, only the signal from tellurium(IV) is obtained. On the other hand, when titanium(III) chloride solution is added before the addition of borohydride solution, total signal from tellurium(IV) and tellurium(VI) can be obtained; 30—60 s of prereduction is required. The effectiveness of the titanium(III) chloride-borohydride reduction system is shown in the interference study. The interference of selenium(IV) is eliminated up to 200 fold vs. 0.25 μg of tellurium(IV) in 20 cm3 of 3 mol dm−3 hydrochloric acid by the use of 2 cm3 of 5% w/v titanium(III) chloride solution as a prereductant. Tellurium in steel and sulfur (commercial reagent) can be determined satisfactorily without isolation of tellurium from matrix by this method. Detection limit of the method is 8 ng. The coefficient of variation of the method is 2.4% in the ten determinations of 0.25 μg of tellurium.

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