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A novel method of synthesizing solid phase adsorbent silica modified with xylenol orange: application for separation, pre-concentration and determination of uranium in calcium rich hydro-geochemical samples and sea water—Part 1

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Abstract

A novel, single-step route has been developed for the synthesis of solid phase adsorbent silica modified with xylenol orange. The addition of cationic surfactant cetyl tri-methylammonium bromide during the synthesis of the adsorbent supports the formation of a stable coating of xylenol orange on silica. The adsorbent showed no signs of degradation in contact with organic solvents and with solutions of varying pH between 1 and 9. This adsorbent has been used for separation and pre-concentration of uranium from hydro-geochemical samples with high calcium content and from sea water. Quantitative sorption of uranium was observed above pH 3 and complete desorption can be achieved using 0.2 M sodium pyrophosphate solution. The uranium content in the extract was determined by laser fluorimetric technique. The equilibration time is 30 min. The sorption capacity of the adsorbent for uranium is 10 mg g−1. An enrichment factor of 50 was obtained by this procedure taking 500 mL of sample solution. Uranium concentrations down to 0.05 ng mL−1 can be determined after pre-concentration using this method. The relative standard deviation at an 0.1 ng mL−1 level is ±15%.

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Acknowledgements

The authors are thankful to the Shri.A.K.Rai, Regional Director, Southern Region, AMD, Bangalore; Additional Director (OP-I) and Additional Director (R&D), AMD, Hyderabad, for their encouragement and providing facilities to carry out this work. The authors are thankful to Dr. K.Satyanarayana, SO/G, Head, Chemistry Group, AMD, Hyderabad and Dr.A. Premadas SO/G, Chemistry Laboratory, Bangalore for their constant encouragement and technical advice. Authors are also grateful to the Director, AMD for presentation/publication of the investigation.

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  1. Chemistry Laboratory, Atomic Minerals Directorate for exploration and Research, Southern Region, Nagarbhavi, Bangalore, 560072, India

    Bincy Cyriac & B. K. Balaji

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  1. Bincy Cyriac
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  2. B. K. Balaji
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Correspondence to Bincy Cyriac.

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Cyriac, B., Balaji, B.K. A novel method of synthesizing solid phase adsorbent silica modified with xylenol orange: application for separation, pre-concentration and determination of uranium in calcium rich hydro-geochemical samples and sea water—Part 1. Microchim Acta 171, 33–40 (2010). https://doi.org/10.1007/s00604-010-0369-2

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  • DOI: https://doi.org/10.1007/s00604-010-0369-2

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