On-line preconcentration/determination of lead in Ilex paraguariensis samples (mate tea) using polyurethane foam as filter and USN-ICP-OES

JOURNAL OF HAZARDOUS MATERIALS

卷:124

Article

Marchisio, PF ; Sales, A ; Cerutti, S ; Marchevski, E ; Martinez, LD

关键词: lead determination;    on-line preconcentration;    polyurethane foam;    USN-ICP-OES;    mate tea samples;   

DOI  :  10.1016/j.jhazmat.2005.04.017

来源: Elsevier

【 摘 要 】

The present paper proposes an on-line preconcentration procedure for lead determination in Ilex paraguariensis (St. Hilaire) samples by ultrasonic nebulization associated to inductively coupled plasma optical emission spectrometry (USN-ICP-OES). It is based on the precipitation of lead(II) ion on a minicolumn packed with polyurethane foam using 2-(5-bromo-2-pyridilazo)-5-diethylaminophenol (5-Br-PADAP) as precipitating reagent. The collected analyte precipitate was quantitatively eluted from the minicolumn with 20% (v/v) nitric acid. An enhancement factor of 225-fold was obtained (15 for USN and 15 for preconcentration). The detection limit (DL) value for the preconcentration of 10.0ml of sample was 40.0ng/l. The relative standard deviation (R.S.D.) was 3.0% for a Pb concentration of 1 mu g/l, calculated from the peak heights obtained. The calibration graph using the preconcentration system for lead was linear with a correlation coefficient of 0.9997, at levels near the detection limits up to at least 100 mu g/l. The preconcentration procedure was successfully applied to the determination of lead in mate tea samples. (c) 2005 Elsevier B.V. All rights reserved.

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