A novel on-line preconcentration method for trace molybdenum determination by USN–ICP OES with biosorption on immobilized yeasts
2007; Elsevier BV; Volume: 86; Issue: 2 Linguagem: Inglês
10.1016/j.microc.2007.02.001
ISSN1095-9149
AutoresRaúl A. Gil, S.D. Pasini Cabello, Andrés Takara, Patricia Smichowski, Roberto A. Olsina, Luis D. Martínez,
Tópico(s)Radioactive element chemistry and processing
ResumoA new system for on-line preconcentration of molybdenum by sorption on a minicolumn associated to inductively coupled plasma -optical emission spectrometry with ultrasonic nebulization was studied.It is based on the sorption of molybdenum on a column packed with immobilized baker's yeasts on controlled pore glass without further complexing reagent.The molybdenum preconcentrated by biosorption was subsequently eluted with hydrochloric acid.Considering a sample flow rate of 5.0 mL min -1 , 10 mL of sample was preconcentrated in 2 min.achieving a sensitive total enhancement factor of 480-fold, and t he 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.
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