title: Investigation of chemical modifiers for the direct determination of arsenic in fish oil using high-resolution continuum source graphite furnace atomic absorption spectrometry.
abstract: High-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) has been applied for the development of a method for the determination of total As in fish oil samples using direct analysis. The method does not use any sample pretreatment, besides dilution with 1-propanole, in order to decrease the oil viscosity. The stability and sensitivity of As were evaluated using ruthenium and iridium as permanent chemical modifiers and palladium added in solution over the sample. The best results were obtained with ruthenium as the permanent modifier and palladium in solution added to samples and standard solutions. Under these conditions, aqueous standard solutions could be used for calibration for the fish oil samples diluted with 1-propanole. The pyrolysis and atomization temperatures were 1400 °C and 2300 °C, respectively, and the limit of detection and characteristic mass were 30 pg and 43 pg, respectively. Accuracy and precision of the method have been evaluated using microwave-assisted acid digestion of the samples with subsequent determination by HR-CS GF AAS and ICP-MS; the results were in agreement (95% confidence level) with those of the proposed method.
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Éderson R
authors.initials: ÉR
authors.lastname: Pereira
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Tarcísio S
authors.initials: TS
authors.lastname: de Almeida
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Daniel L G
authors.initials: DL
authors.lastname: Borges
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Carasek
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil. Electronic address: w.bernardo@terra.com.br.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Welz
authors.affiliation: Trace Element Speciation Laboratory (TESLA), Chemistry, University of Aberdeen, AB24 3UE Scotland, UK.
authors.forename: Jörg
authors.initials: J
authors.lastname: Feldmann
authors.affiliation: Golden Omega S.A., Arica, Chile.
authors.forename: Javier Del
authors.initials: JD
authors.lastname: Campo Menoyo
mesh_terms: D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D002138:Calibration; D005395:Fish Oils / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis; D006108:Graphite / Q000737:chemistry*; D007221:Industry; D013058:Mass Spectrometry; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D005395:Fish Oils; D014874:Water Pollutants, Chemical; D006108:Graphite; D001151:Arsenic
keywords: Arsenic determination; Direct analysis; Fish oil; Graphite furnace atomization; High-resolution continuum source atomic absorption spectrometry