Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560821 | Talanta | 2005 | 8 Pages |
Abstract
This paper reports the development of a new strategy for low-level determination of copper in water samples by using a flow-injection system coupled to solid-phase extraction (SPE) using flame atomic absorption spectrometry (F AAS) as detector. In order to preconcentrate copper from samples, a minicolumn packed with a styrene-divinylbenzene resin functionalized with (S)-2-[hydroxy-bis-(4-vinyl-phenyl)-methyl]-pyrrolidine-1-carboxylic acid ethyl ester was used and the synthesis procedure is described. System operation is based on the on-line retention of Cu(II) ions at pH 9.0 ± 0.2 in a such minicolumn with posterior analyte elution with 2 mol lâ1 HCl directly to the F AAS nebulizer. The influence of several chemical (sample pH, buffer concentration, HCl eluent concentration and effect of the ionic strength) and flow (sample and eluent flow rates and preconcentration time) variables that could affect the performance of this system were investigated as well as the possible interferents. At optimized conditions, for 2 min of preconcentration time (13.2 ml of sample volume), the system achieved a detection limit of 1.1 μg lâ1, a R.S.D. 1% at 20 μg g lâ1 and an analytical throughput of 25 hâ1, whereas for 4 min of preconcentration time (26.4 ml of sample volume), a detection limit of 0.93 μg lâ1, a R.S.D. 5.3% at 5 μg lâ1 and a sampling frequency of 13 hâ1 were reported.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ricardo J. Cassella, Otto I.B. Magalhães, Marcos Tadeu Couto, Edson Luiz S. Lima, Marcia Angélica F.S. Neves, Fernanda Margarida B. Coutinho,