Use of Amberlite XAD-2 Loaded with 1-(2-Pyridylazo)-2-naphthol as a Preconcentration System for River Water Prior to Determination of Cu2+, Cd2+ and Pb2+ by Flame Atomic Absorption Spectroscopy

被引：0
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作者：
Pilar Bermejo-Barrera
Martínez Alfonso Nancy
Díaz López Cristina
Bermejo Barrera Adela
机构：
[1] Department of Analytical Chemistry,
[2] Nutrition and Bromatology,undefined
[3] Faculty of Chemistry,undefined
[4] University of Santiago de Compostela,undefined
[5] E-15782 Santiago de Compostela,undefined
[6] Spain,undefined
[7] Department of Analytical Chemistry,undefined
[8] Institute of Materials and Reagents – Faculty of Chemistry,undefined
[9] University of La Habana,undefined
[10] La Habana,undefined
[11] Cuba,undefined
来源：
Microchimica Acta | 2003年 / 142卷
关键词：
Key words: Flame atomic absorption spectrometry; copper(II); cadmium(II); lead(II); Amberlite XAD-2; 1-(2-pyridylazo)-2-naphthol (PAN); preconcentration; river water.;
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摘要：
 A procedure for separation and preconcentration of trace amounts of copper(II), cadmium(II) and lead(II) in river water samples is proposed. The procedure is based on the adsorption of Cu2+, Cd2+ and Pb2+ ions on a column of Amberlite XAD-2 resin loaded with 1-(2-pyridylazo)-2-naphthol (PAN) reagent prior to their determination by flame atomic absorption spectrometry (FAAS). Sorption is quantitative in the pH range of 6.0–8.5 for Cu, 7.5–8.5 for Cd and 8.0–11.0 for Pb; the optimum pH for simultaneous retention was 8.5. Quantitative desorption for Cu2+ occurs in a 2–3 M HCl or 2–3 M HNO3 medium, for Cd2+ in a 2–4 M HCl or 0.5–3 M HNO3 medium, and only with 3 M HNO3 for Pb2+. The sorption capacity of the resin was 0.1081, 0.0228, and 0.0065 mmole g−1 of the dry Amberlite-PAN for Cu2+, Cd2+ and Pb2+, respectively. The simultaneous determination of three cations is possible using 3 M HNO3 as an eluent. The limit of tolerance of some electrolytes were also studied.
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页码：101 / 108
页数：7
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