Abstract.
The conditions for cloud point extraction of lead(II) from aqueous solutions were investigated and optimized. The procedure is based on the separation of Pb(II) – brillant cresyl blue (BCB) complexes into the micellar media by adding the surfactant Triton X-114. After phase separation, the surfactant-rich phase was dissolved with 1 mol L−1 HNO3 in ethanol and diluted with 1 mol L−1 HNO3 solution before lead was determined by flame atomic absorption spectrometry. Optimization of the pH, ligand and surfactant quantities, incubation time, temperature, viscosity, sample volume, and interfering ions was performed. The effects of the matrix ions were also examined. The detection limits for three times the standard deviations of the blank for lead were 7.5 µg L−1 for water samples and 0.33 µg g−1 for sediment samples. The validity of cloud point extraction was checked by employing certified reference samples of Lake Sediment IAEA-SL-1 and Sewage Sludge BCR-CRM 144R. The procedure was applied to natural waters and sediment samples with satisfactory results (recoveries >95%, relative standard deviations <6.4%).
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Surme, Y., Narin, I., Soylak, M. et al. Cloud point extraction procedure for flame atomic absorption spectrometric determination of lead(II) in sediment and water samples. Microchim Acta 157, 193–199 (2007). https://doi.org/10.1007/s00604-006-0671-1
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DOI: https://doi.org/10.1007/s00604-006-0671-1