Resumo

ZEGARRA PISCONTI1, Marixa  e  CJUNO HUANCA, Jesús. Lead preconcentration in synthetic samples with triton x-114 in the cloud point extraction and analysis by atomic absorption (EAAF). Rev. Soc. Quím. Perú [online]. 2015, vol.81, n.1, pp.3-13. ISSN 1810-634X.

A methodology was developed about lead preconcentration in water samples that were added dithizone as complexing agent, previously dissolved in the nonionic surfactant Triton X-114, until the formation of the critical micelle concentration and the cloud point temperature. The centrifuged system gave a precipitate with high concentrations of Pb (II) that was measured by atomic absorption spectroscopy with flame (EAAF). The method has proved feasible to be implemented as a method of preconcentration and analysis of Pb in aqueous samples with concentrations less than 1 ppm. Several parameters were evaluated to obtain a percentage recovery of 89.8%.

Palavras-chave : Preconcentration; surfactant; dithizone; critical micelle concentration (CMC); cloud point temperature; Triton X-114; EAAF; recovery.

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