Journal
MICROCHIMICA ACTA
Volume 159, Issue 3-4, Pages 379-385Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-007-0742-y
Keywords
nanometer-sized zirconia; microcolumn separation/preconcentration; trace metals; environmental samples; ICP-OES
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A new method is proposed using a microcolumn (20 mm x 2.0 mm) packed with nanometer-sized zirconia as solid-phase extractor for the separation/preconcentration of Mn, Cu, Cr, Zn, Ni and Co prior to their determination by inductively coupled plasma optical emission spectrometer (ICP-OES) in environmental samples. The factors affecting the separation and preconcentration of analytes such as pH, sample flow rate and volume, eluent concentration and volume were determined, interfering ions were studied, and the optimal experimental conditions were established. The adsorption capacity of nanometer-sized ZrO2 for Mn, Cu, Cr, Zn, Ni and Co was found to be 1.3, 1.3, 1.7, 2.0, 3.9 and 1.5 mg g(-1), respectively. The detection limits of the method were 12, 58, 24, 2, 7 and 36 ng L-1, respectively, with a preconcentration factor of 25. The precision of this method was 1.7% (Mn), 2.9% (Cu), 5.9% (Mn), 3.8% (Mn), 6.2% (Mn) and 4.3% (Mn) with 9 determinations of 10 ng mL(-1) of target get analytes, respectively. The method was successfully applied to the determination of trace metals in lake water, dried fish samples, certified reference materials of human hair and milk, and provided satisfactory results.
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