Simultaneous cloud-point extraction of nine cations from water samples and their determination by flame atomic absorption spectrometry. |
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Authors: | Mir Ali Farajzadeh Mohammad Rasoul Fallahi |
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Institution: | Department of Chemistry, Faculty of Science, University of Urmia, Iran. farajzade@yahoo.com |
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Abstract: | The cloud-point methodology was successfully employed for the preconcentration of heavy metal cations at trace levels from aqueous samples prior to flame atomic absorption spectrometry (FAAS). Cations were taken into a complex with 8-quinolinol in an aqueous non-ionic surfactant, Triton X-114, medium and concentrated in the surfactant rich phase by bringing the solution to the cloud-point temperature. The preconcentration of only 100 mL of the solution with 1% Triton X-114 and 10(-3) M 8-quinolinol at pH 7.0 gave a preconcentration factor higher than 100 for most cations. Under these conditions, the detection limits of the cloud-point extraction-FAAS system were 0.8 - 15 microg/L. |
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