title: Determination of essential elements in beverages, herbal infusions and dietary supplements using a new straightforward sequential approach based on flame atomic absorption spectrometry.
abstract: A simple method based on FAAS was developed for the sequential multi-element determination of Cu, Zn, Mn, Mg and Si in beverages and food supplements with successful results. The main absorption lines for Cu, Zn and Si and secondary lines for Mn and Mg were selected to carry out the measurements. The sample introduction was performed using a flow injection system. Using the choice of the absorption line wings, the upper limit of the linear range increased up to 110mgL-1for Mg, 200mgL-1for Si and 13mgL-1for Zn. The determination of the five elements was carried out, in triplicate, without the need of additional sample dilutions and/or re-measurements, using less than 3.5mL of sample to perform the complete analysis. The LODs were 0.008mgL-1for Cu, 0.017mgL-1for Zn, 0.011mgL-1for Mn, 0.16mgL-1for Si and 0.11mgL-1for Mg.
authors.affiliation: Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Avda. Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Gómez-Nieto
authors.affiliation: Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Avda. Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, 28049 Madrid, Spain. Electronic address: mariajesus.gismera@uam.es.
authors.forename: Mª Jesús
authors.initials: MJ
authors.lastname: Gismera
authors.affiliation: Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Avda. Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Mª Teresa
authors.initials: MT
authors.lastname: Sevilla
authors.affiliation: Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Avda. Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Jesús R
authors.initials: JR
authors.lastname: Procopio
mesh_terms: D001628:Beverages / Q000032:analysis*; D019587:Dietary Supplements / Q000032:analysis*; D029001:Herbal Medicine; D013054:Spectrophotometry, Atomic / Q000379:methods*
keywords: Essential elements in foods; Flame atomic absorption spectrometry (FAAS); High-resolution continuum source AAS; Multi-element determination