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Tl(III) was extracted and preconcentrated using cloud point extraction (CPE) for its determination in water samples using flame atomic absorption spectrometry (FAAS). The CPE procedure was performed using a non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) as an extractant at room temperature in the presence Br −  or I − . Tl(I) was oxidized in presence of bromine water to T(III) to form Tl(Br) 3  complex which then was extracted into the surfactant-rich phase. The factors influencing the CPE such as sample pH, concentrations of bromide and iodide ions and Triton X-114 were studied. After optimisation of CPE conditions, the preconcentration factors were found 74 for Br 2  and 68 for KI, the limits of detection (3 s) were 5.7 and 8 ng mL −1  for Br 2  and KI, respectively. The relative standard deviation (RSD) was 3.7% for Br 2  and 2.6% for KI. The results showed that the proposed method was free from interference. The CPE method was successfully used for Tl(III) determination in real samples.

A developed cloud point extraction method for Tl(III) determination by flame atomic absorption spectrometry