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A Pre-Concentration Procedure Using Cloud Point Extraction for the Determination of Uranium in Natural Water

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Abstract.

A pre-concentration procedure using cloud point extraction is presented for the determination of uranium in natural water using molecular absorption spectrometry. The ligand used was 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (Br-PADAP) and the micellar phase was obtained using the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) and centrifugation. Interferences were eliminated using a masking solution containing trans-1,2-cyclohexanediaminetetraacetic acid (CDTA), sodium fluoride and sulphosalicylic acid. The optimization step was performed using a two-level factorial design and a Doehlert matrix, involving the factors pH, centrifugation time and buffer concentration.

The method allows the determination of uranium in water samples with a detection limit of 0.15 µg L−1, a quantification limit of 0.50 µg L−1 and a precision expressed as relative standard deviation of 1.8 and 2.3% for uranium concentrations of 5 and 10 µg L−1, respectively (n = 8). The accuracy was confirmed by analysis of two certified samples of natural water. This method was applied to the determination of uranium in superficial water samples collected at a uranium mine in Brazil. For five samples analyzed, the concentration of uranium varied between 1.1 and 18.1 µg L−1. Tests of addition/recovery were performed for all these samples, and the results varying between 98 and 105% also proved that this procedure is not affected by the matrix and can be applied satisfactorily to the determination of uranium in water samples.

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Authors and Affiliations

  1. Universidade Federal da Bahia, Instituto de Química, Núcleo de Excelência em Química Analítica da Bahia, Campus Universitário de Ondina, 40170-290, Salvador, Bahia, Brasil

    Hadla Sousa Ferreira, Marcos de Almeida Bezerra & Sérgio Luis Costa Ferreira

  2. Universidade Estadual do Sudoeste da Bahia, Departamento de Química e Exatas, Campus de Jequié, 45206-190, Jequié, Bahia, Brazil

    Marcos de Almeida Bezerra

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  1. Hadla Sousa Ferreira
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  2. Marcos de Almeida Bezerra
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  3. Sérgio Luis Costa Ferreira
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Correspondence to Sérgio Luis Costa Ferreira.

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Ferreira, H., Bezerra, M. & Costa Ferreira, S. A Pre-Concentration Procedure Using Cloud Point Extraction for the Determination of Uranium in Natural Water. Microchim Acta 154, 163–167 (2006). https://doi.org/10.1007/s00604-005-0475-8

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