title: Improved solid-phase extraction/micellar procedure for the derivatization/preconcentration of benzaldehyde and methyl derivatives from water samples.
abstract: A simple, rapid and sensitive method has been developed for the determination of aromatic low-molecular mass aldehydes (LMMAs) such as benzaldehyde (BA) and methyl derivatives in water samples through the use of liquid chromatography-diode array detection (LC-DAD). The method is based on the continuous in situ derivatization of the aldehydes with 2,4-dinitrophenylhydrazine (DNPH) on a LiChrolut EN solid-phase extraction (SPE) column in the presence of sodium dodecyl sulfate (SDS) micelles. After elution, hydrazones were successfully separated on a RP-C(18) column using a linear gradient mobile phase of acetonitrile (ACN)-water at 75-95% ACN for 10 min. Linearity was established over the concentration range 0.4-200 μg L(-1) and limits of detection (LODs) from 120 to 200 ng L(-1); the inter-day precision expressed as the relative standard deviation (RSD) of the aldehydes ranged from 3.0% to 3.5%. The method was successfully applied to the analysis of aromatic and aliphatic LMMAs in water samples with average recoveries ranging between 93.6% and 99.5%. The proposed method surpasses other chromatographic alternatives in terms of LODs, sample requirements for analysis and cost.
authors.affiliation: Department of Analytical Chemistry, Marie-Curie Building (Annex), Rabanales Campus, University of Cordoba, E-14071 Cordoba, Spain.
authors.forename: José María
authors.initials: JM
authors.lastname: Fernández-Molina
authors.forename: Manuel
authors.initials: M
authors.lastname: Silva
mesh_terms: D000447:Aldehydes / Q000032:analysis*; D001547:Benzaldehydes / Q000737:chemistry* / Q000302:isolation & purification; D001555:Benzene Derivatives / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods; D057230:Limit of Detection; D008745:Methylation; D008823:Micelles; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D014867:Water
chemical_list: D000447:Aldehydes; D001547:Benzaldehydes; D001555:Benzene Derivatives; D008823:Micelles; D014867:Water; C032175:benzaldehyde