A NOVEL ON-LINE PRECONCENTRATION METHOD FOR TRACE MOLYBDENUM DETERMINATION BY USN-ICP OES WITH BIO-SORPTION ON IMMOBILIZED YEASTS

RAÚL A. GIL, SERGIO PASINI-CABELLO, ANDRÉS TAKARA, PATRICIA SMICHOWSKI, ROBERTO A. OLSINA, LUIS D. MARTINEZ

MICROCHEMICAL JOURNAL

Elsevier

Año: 2007 vol. 86 p. 156 - 160

0026-265X

A new system for on-line preconcentration of molybdenum by sorption on a minicolumnassociated to inductively coupled plasma – optical emission spectrometry withultrasonic nebulization was studied. It is based on the sorption of molybdenum on acolumn packed with immobilized baker’s yeasts on controlled pore glass without furthercomplexing reagent. The molybdenum preconcentrated by biosorption wassubsequently eluted with hydrochloric acid. Considering a sample flow rate of 5.0 mLmin-1, 10 mL of sample was preconcentrated in 2 min. achieving a sensitive totalenhancement factor of 480-fold, and the detection limit (3s) obtained was 21 ng L–1.Additionally, the calculated precisions expressed as percent relative standard deviation(RSD%) was 1.9%. Satisfactory results were obtained for the determination of molybdenum in standard reference material NIST 1643e Trace Elements in Water and real water samples.