Rapid determination of Pb and Po by sequential cloud point extraction for environmental monitoring.

A new sequential cloud point extraction (CPE) procedure was developed and validated for the determination of Pb and Po by ICP-MS/MS and alpha spectrometry, respectively. Two distinct CPE systems using 4',4''(5'')-di--butyldicyclohexano-18-crown-6 and ,,','-tetraoctyldiglycolamide as chelating agents were performed sequentially on the same sample. Method detection limits of 13 and 3.

Determination of polonium-210 in environmental samples using diglycolamide-based cloud point extraction coupled to alpha spectrometry analysis.

This study presents a novel cloud point extraction (CPE) methodology for the separation and enrichment of polonium-210 prior to alpha-spectrometric quantification in water, urine and digested samples. The extractive behaviour of diglycolamide-based ligands towards Po by CPE was determined and optimised in various acidic conditions. The extraction efficiency and selectivity of the CPE systems depend greatly on the choice of the extracting agent and acidic conditions.

Determination of Pb in environmental samples after cloud point extraction using crown ether.

In the present study, a new cloud point extraction methodology based on the selective preconcentration and the extraction of stable lead in acidic conditions with 4',4''(5'')-di-tert-butyldicyclohexano-18-crown-6 as a chelating agent was developed, optimized and validated. A mixture of Triton X-114 as non-ionic surfactant and CTAB as cationic surfactant was used to produce micellar structures that incorporate the chelating agent. Phase separation, induced by coacervation, was achieved by increasing the temperature of the system above the cloud point temperature.