title: Determination of Cr and Ni in Orujo spirit samples by ETAAS using different chemical modifiers.
abstract: Several analytical methods are proposed for chromium and nickel determination in Orujo spirit samples using ETAAS. Permanent chemical modifiers such as W, Ir, Ru, W-Ir and W-Ru were comparatively studied in relation to the common chemical modifier employed, Pd(NO3)2-Mg(NO3)2. Taking into account the analytical performance, the method based on the use of Ru as a permanent modifier was selected for further direct Cr determinations in Orujo samples. In the case of Ni, after comparison among the different methods developed, a method with no modifier which allows the direct interpolation in calibration graphs was chosen. Detection limits of 0.13μgL(-1) and 0.30μgL(-1) were obtained for Cr and Ni, respectively. For all methods developed, recoveries (ranged 98.6-102%) and precision (RSD<10%) were acceptable. The selected methods were applied for the determination of the Cr and Ni contents in 80 representative Orujo Galician samples. The Cr concentrations ranged from <LOD and 14.61μgL(-1) and Ni concentrations ranged <LOD and 34.17μgL(-1).
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus de Lugo, 27002 Lugo, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Vilar Fariñas
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus de Lugo, 27002 Lugo, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Barciela García
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus de Lugo, 27002 Lugo, Spain.
authors.forename: S
authors.initials: S
authors.lastname: García Martín
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus de Lugo, 27002 Lugo, Spain.
authors.forename: R M
authors.initials: RM
authors.lastname: Peña Crecente
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus de Lugo, 27002 Lugo, Spain. Electronic address: cherrero@lugo.usc.es.
authors.forename: C
authors.initials: C
authors.lastname: Herrero Latorre
keywords: Alcoholic distillate spirits; Chromium determination; ETAAS; Matrix modifier; Nickel determination; Orujo