Synthetic zeolites as sorbent material for on-line preconcentration of copper traces and its determination using flame atomic absorption spectrometry

被引:45
作者
de Peña, YP [1 ]
López, W
Burguera, JL
Burguera, M
Gallignani, M
Brunetto, R
Carrero, P
Rondon, C
Imbert, F
机构
[1] Univ Los Andes, Fac Sci, IVAIQUIM, Merida 5101A, Venezuela
[2] Univ Los Andes, Fac Sci, Lab Kinet & Catalysis, Merida 5101A, Venezuela
关键词
on-line preconcentration; synthetic zeolites; flow injection; copper; atomic absorption spectroscopy;
D O I
10.1016/S0003-2670(99)00566-8
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
This work assesses for the first time the potential of synthetic zeolites as adsorptive material for the preconcentration of copper traces. This involves the formation of a copper chelate, its adsorption on sodium lynde Type A (Na-LTA) and sodium faujasite Type X (Na-Fau) synthetic zeolite minicolumns, and its elution with 300 mu l of methyl isobutyl ketone. Using 5-80 mg of either sorbents materials with a loading time of 2 min per sample preconcentration factors of copper ranging from 35-125 for Na-LTA and 3065 for Na-Fau were readily achieved related to the direct introduction of aqueous solutions into an atomic absorption spectrometer. To evaluate the performance of these materials, a flow injection system was used for samples of water from different sources, and the accuracy was assessed through recovery experiments and the analysis of certified reference materials. A parallel experiment was performed with polygosyl bonded silica reversed-phase sorbent with octadecyl functional groups (RP-C-18) as sorbent in the minicolumn in order to study the performance of this. well-known material as a reference for the new sorbents. The 3 sigma detection limits, relative standard deviation and linear calibration graphs were, respectively, 0.1 ng ml(-1), 2.6% and 2.5-30 ng ml(-1) for Na-LTA and 0.4 ng ml(-1), 2.8% and 2.5-40 ng ml(-1) for Na-Fau for preconcentration times of 2 min. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:249 / 258
页数:10
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