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A Cloud point extraction (CPE) procedure was presented for preconcentration   of lead(II) ions, after complexation by 18-crown-6 (18C6) and extraction   with Triton X-100 at proposed experimental conditions. After separation of   surfactant - rich phase, content of Pb(II) ions in remaining solution was   measured by Flame Atomic Absorption Spectrometry (FAAS). The experimental   conditions such as pH, temperature, concentration of Triton X-100,   concentration of 18C6, incubation time, type and concentration of added   electrolyte, were evaluated. Results showed that among investigated   electrolytes (NaCl, Na2SO4 and Na2CO3) the amount of 0.9 mol/L Na2CO3 lowers   cloud point temperature of Triton X-100 to 22?C (room temperature during the   experiment), thus simplifying the extraction procedure. After an incubation   time of 5 minutes and using the concentration of 1.2?10-3 mol/L Triton X-100   and 1.5?10-4 mol/L 18C6 (1:1 stoichiometric ratio for 18C6:Pb), 60% of lead   (II) ions were efficiently removed from investigated solution.

Cloud point extraction procedure for preconcentration and determination of lead(II) ions using triton X-100 at room temperature