title: Rapid screening of water soluble arsenic species in edible oils using dispersive liquid-liquid microextraction.
abstract: A methodology for the non-chromatographic screening of the main arsenic species present in edible oils is discussed. Reverse dispersive liquid-liquid microextraction was used to extract water soluble arsenic compounds (inorganic arsenic, methylarsonate, dimethylarsinate and arsenobetaine) from the edible oils into a slightly acidic aqueous medium. The total arsenic content was measured in the extracts by electrothermal atomic absorption spectrometry using palladium as the chemical modifier. By repeating the measurement using cerium instead of palladium, the sum of inorganic arsenic and methylarsonate was obtained. The detection limit was 0.03 ng As per gram of oil. Data for the total and water-soluble arsenic levels of 29 samples of different origin are presented. Inorganic arsenic was not found in any of the samples marketed as edible oils.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30100 Murcia, Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: López-García
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30100 Murcia, Spain.
authors.forename: Marisol
authors.initials: M
authors.lastname: Briceño
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30100 Murcia, Spain.
authors.forename: Yesica
authors.initials: Y
authors.lastname: Vicente-Martínez
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30100 Murcia, Spain. Electronic address: hcordoba@um.es.
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández-Córdoba
mesh_terms: D001151:Arsenic / Q000032:analysis*; D059627:Liquid Phase Microextraction / Q000379:methods*; D009821:Oils / Q000032:analysis*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014867:Water / Q000032:analysis*
chemical_list: D009821:Oils; D014867:Water; D001151:Arsenic
keywords: Arsenic; Dispersive liquid–liquid microextraction; Edible oils; Electrothermal atomic absorption spectrometry; Speciation