title: Effect of different precursors on generation of reference spectra for structural molecular background correction by solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry: Determination of antimony in cosmetics.
abstract: Different precursors were evaluated for the generation of reference spectra and correction of the background caused by SiO molecules in the determination of Sb in facial cosmetics by high-resolution continuum source graphite furnace atomic absorption spectrometry employing direct solid sample analysis. Zeolite and mica were the most effective precursors for background correction during Sb determination using the 217.581nm and 231.147nm lines. Full 23factorial design and central composite design were used to optimize the atomizer temperature program. The optimum pyrolysis and atomization temperatures were 1500 and 2100°C, respectively. A Pd(NO3)2/Mg(NO3)2mixture was employed as the chemical modifier, and calibration was performed at 217.581nm with aqueous standards containing Sb in the range 0.5-2.25ng, resulting in a correlation coefficient of 0.9995 and a slope of 0.1548s ng-1. The sample mass was in the range 0.15-0.25mg. The accuracy of the method was determined by analysis of Montana Soil (II) certified reference material, together with addition/recovery tests. The Sb concentration found was in agreement with the certified value, at a 95% confidence level (paired t-test). Recoveries of Sb added to the samples were in the range 82-108%. The limit of quantification was 0.9mgkg-1and the relative standard deviation (n=3) ranged from 0.5% to 7.1%. From thirteen analyzed samples, Sb was not detected in ten samples (blush, eye shadow and compact powder); three samples (two blush and one eye shadow) presented Sb concentration in the 9.1-14.5mgkg-1range.
authors: Univ. Estadual Paulista - Unesp, Departamento de Química Analítica, P.O. Box 355, 14800-060, Araraquara - SP, Brazil.
authors: Ariane Isis
authors: AI
authors: Barros
authors: Univ. Estadual Paulista - Unesp, Departamento de Química Analítica, P.O. Box 355, 14800-060, Araraquara - SP, Brazil.
authors: Diego
authors: D
authors: Victor de Babos
authors: Univ. Estadual Paulista - Unesp, Departamento de Química Analítica, P.O. Box 355, 14800-060, Araraquara - SP, Brazil. Electronic address: edilene@iq.unesp.br.
authors: Edilene Cristina
authors: EC
authors: Ferreira
authors: Univ. Estadual Paulista - Unesp, Departamento de Química Analítica, P.O. Box 355, 14800-060, Araraquara - SP, Brazil.
authors: José Anchieta
authors: JA
authors: Gomes Neto
mesh_terms: D000465:Algorithms; D000538:Aluminum Silicates / Q000737:chemistry; D000965:Antimony / Q000032:analysis*; D003257:Consumer Product Safety; D003358:Cosmetics / Q000032:analysis*; D006108:Graphite / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods; D017641:Zeolites / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D003358:Cosmetics; D017616:Magnesium Compounds; D009566:Nitrates; C090639:palladium nitrate; D017641:Zeolites; D010165:Palladium; D012822:Silicon Dioxide; D006108:Graphite; C018330:magnesium nitrate; D000965:Antimony; C011934:mica
keywords: Antimony; Background correction; Facial cosmetics; SiO molecular spectrum