期刊
MICROCHEMICAL JOURNAL
卷 86, 期 2, 页码 156-160出版社
ELSEVIER
DOI: 10.1016/j.microc.2007.02.001
关键词
on-line preconcentration; immobilized baker's yeasts on CPG; Fl-USN-ICP OES; molybdenum; water samples
A 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 the detection limit (3 s) 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. (c) 2007 Elsevier B.V. All rights reserved.
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