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Type: Artigo de periódico
Title: Anion separations for liquid chromatography using propylpyridinium silica as the stationary phase
Author: Auler, LMLA
Silva, CR
Bottoli, CBG
Collins, CH
Abstract: This work describes the characterization and potential applications of a silica-based anion-exchange phase prepared by a two-step modification process that incorporates a propylpyridinium group. The effects of pH and eluent concentration on anion separation were examined using 150 mm x 3.9 mm HPLC columns packed with the new phase. The mobile phase pH values ranged from 3.8 to 6.6 using phthalic acid/Tris solutions. The best separation was achieved using 2.5 mmol L(-1) phthalate/2.4 mmol L(-1) Iris solution at pH 4.2 as mobile phase with non-suppressed conductivity detection. The new stationary phase was used for the separation of some inorganic and organic anions showing good resolution. The stability of the silica-based anion exchange phase was also evaluated. Analytical curves, for concentrations ranging from 0.25 to 10 mg L(-1) for the inorganic anions chloride, nitrite, bromide and nitrate, showed good linear correlations (r > 0.998). The method was tested with certified rainwater samples. The measured and certified values were in good agreement, indicating that the new phase holds significant promise for the analysis of these anions in environmental samples. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Propylpyridinium silica
Anion chromatography
Stationary phase
Country: Holanda
Editor: Elsevier Science Bv
Citation: Talanta. Elsevier Science Bv, v. 84, n. 4, n. 1174, n. 1179, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2011.03.026
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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