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Factor analysis in ion chromatography of carboxylate ions |
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| Authors: | Ulo Haldna, Jaan Pentchuk, Michel Righezza,Jacques R. Chr tien |
| Affiliation: | a Institute of Chemistry, Estonian Academy of Sciences, Akadeemia tee 15, EE-0103 Tallinn, Estonia b Tartu University, Ulikool Street 18, EE-2404 Tartu, Estonia c Laboratoire de Chimiométrie, Université d'Orléans, B.P. 6759, 45067 Orléans Cedex 2, France d Laboratoire de Chimiométrie, Université d'Orléans, B.P. 6759, 45067 Orléans Cedex 2, France Institut de Topologie et de Dynamique des Systèmes, Associé au CNRS, Université de Paris VII, 1 Rue Guy de la Brosse, 75005 Paris, France |
| Abstract: | The retention times of five carboxylate ions (formate, acetate, propionate, n-butanoate and n-pentanoate) in ion chromatography were determined using 25 eluents prepared from NaHCO3 and Na2CO3. Principal component analysis (PCA) and correspondence factor analysis (CFA) were applied to describe the behaviour of the carboxylate anions and the influence of the carbonate concentration of the eluents. With PCA, only one factor is necessary to model the retention times of each ion studied. CFA offers an analysis of second-order effects and shows how the selectivities of the chromatographic systems are modified with either the carbonate concentration or the concentration ratio of NaHCO3 and Na2CO3. |
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