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Mohammad Ali TaherDepartment of Chemistry, Shahid Bahonar University, P.O. Box 76175-133, Kerman, IranReceived December 23, 2002Thallium is quantitatively retained by 1,10-phenanthroline and tetraphenylborate onto benzophenone in the pHrange 0-11 from a large volumes of aqueous solutions of various samples. After filtration, the solid massconsisting of thallium complex and benzophenone is dissolved with 5 mL of dimethylformamide and the metalwas determined by flame atomic absorption spectrometric. About 0.4 µg of thallium can be concentrated from400 mL of aqueous sample, where its concentration is as low as 1.0 ng/mL. Eight replicate determinations of8.0 µg/mL of thallium in final dimethylformamide solution gave a mean absorbance of 0.160 with a relativestandard deviation of 1.7%. The sensitivity for 1% absorption was 0.22 µg/mL. The interference of a largenumber of anions and cations has been studied and the optimized conditions developed were utilized for thetrace determination of thallium in various alloys and biological samples. Key Words : Benzophenone adsorption, 1,10-Phenanthroline, Solid-liquid extraction of thalliumIntroductionSolid-liquid extraction after adsorption of metal chelatesonto benzophenone is rapid and convenient and can beapplied to many types of metal complexes. The only draw-back is in the filtration and drying. A survey of the literaturerevealed that various adsorbents, such as thiol cotton,

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Flame Atomic Absorption Spectrometric Determination of Trace Amounts of Thallium after Solid-Liquid Extraction and Preconcentration with Use of 1,10-Phenanthroline onto Benzophenone