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

TALANTA

卷:161

Article

Barros, Ariane Isis¹  de Babos, Diego Victor¹  Ferreira, Edilene Cristina¹  Gomes Neto, Jose Anchieta¹ 

[1] Univ Estadual Paulista Unesp, Dept Quim Analit, POB 355, BR-14800060 Araraquara, SP, Brazil

关键词: SiO molecular spectrum;    Background correction;    Facial cosmetics;    Antimony;   

DOI  :  10.1016/j.talanta.2016.09.017

来源: Elsevier

【 摘 要 】

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 217.581 nm and 231.147 nm lines. Full 2(3) factorial design and central composite design were used to optimize the atomizer temperature program. The optimum pyrolysis and atomization temperatures were 1500 and 2100 degrees C, respectively. A Pd(NO3)(2)/Mg(NO3)(2) mixture was employed as the chemical modifier, and calibration was performed at 217.581 nm with aqueous standards containing Sb in the range 0.5-2.25 ng, resulting in a correlation coefficient of 0.9995 and a slope of 0.1548 s ng(-1). The sample mass was in the range 0.15-0.25 mg. 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 0.9 mg kg(-1) and 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 - 14.5 mg kg(-1) range. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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