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Determination of copper in water samples by atomic absorption spectrometry after cloud point extraction

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Abstract.

Cloud point extraction employing the new reagent 6-[2′-(6′-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid as complexing agent and Triton X-114 as the surfactant is proposed for copper determination. A sample volume of 10 mL was used. Dilution of the surfactant-rich phase with acidified methanol was performed after phase separation, and the copper contents were measured by flame atomic absorption spectrometry. Variables affecting the system were optimized using factorial design and Doehlert matrix. Signals were measured as peak height using an instrument software. Using the experimental conditions defined in the optimization, the method allowed copper determination with a detection limit of 1.5 µg L−1. The calculated enrichment factor is 14. The effects of foreign ions are reported. The accuracy of the procedure was tested by analyzing certified reference material. The method was successfully applied to copper determination in natural and drinking water samples.

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Authors and Affiliations

  1. Núcleo de Química Analítica da Bahia, Laboratório de Química Analítica (LQA), Universidade Estadual do Sudoeste da Bahia, Campus de Jequié, 45200-000, Jequié-BA, Brazil

    Valfredo Azevedo Lemos, Moacy Selis Santos, Márcio José Silva dos Santos, Daniel Rodrigues Vieira & Cleber Galvão Novaes

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  1. Valfredo Azevedo Lemos
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  2. Moacy Selis Santos
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  3. Márcio José Silva dos Santos
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  4. Daniel Rodrigues Vieira
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  5. Cleber Galvão Novaes
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Correspondence to Valfredo Azevedo Lemos.

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Lemos, V., Santos, M., dos Santos, M. et al. Determination of copper in water samples by atomic absorption spectrometry after cloud point extraction. Microchim Acta 157, 215–222 (2007). https://doi.org/10.1007/s00604-006-0652-4

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  • DOI: https://doi.org/10.1007/s00604-006-0652-4

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