Journal
MICROCHEMICAL JOURNAL
Volume 65, Issue 3, Pages 341-346Publisher
ELSEVIER
DOI: 10.1016/S0026-265X(00)00161-2
Keywords
liquid-liquid extraction; PC-88A; liquid surfactant membranes; high preconcentration
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A high preconcentration method by liquid-liquid extraction using liquid surfactant membranes was developed. The water-in-oil (w/o) emulsion containing dilute hydrochloric acid, 2-ethylhexyl hydrogen 2-ethylhexylphosphonate (PC-88A), liquid paraffin, and kerosene was used for the extraction. In a resulting volume of 1000 cm(3) of an aqueous sample solution (pH 5.0) containing less than 1 mg of each metal ion, 2 cm(3) of w/o emulsion droplets coated with sorbitan monooleate were dispersed. The analyte metal ions in the outer bulk aqueous phase were extracted into the organic phase to form a complex with PC-88A and successively back-extracted into the inner aqueous phase. The analytes in the resulting inner aqueous phase were determined subsequently by graphite furnace atomic absorption spectrometry applied as a detector. By this procedure, concentration factors of 570, 820, 750, 970, 860, and 880 were achieved for chromium(III), manganese(II), cobalt(II), nickel(II), copper(II), and cadmium(II), respectively, and also the respective detection limits (3 sigma) of 0.4, 20, 1.2, 18, 18, and 0.7 pg cm(-3) were obtained. (C) 2000 Elsevier Science B.V. All rights reserved.
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