期刊
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
卷 23, 期 4, 页码 753-762出版社
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532012000400022
关键词
rare earth elements; ICP OES; optimization; SBR; Mg II/Mg I
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [PPM-00433-10]
Rare earth elements (REEs) is a peculiar group of chemical elements. Their determination in geological samples is important and complex due to their low concentrations and problems with spectral and non-spectral interferences. Herein, the operating conditions of an inductively coupled plasma optical emission spectrometer were optimized for the determination of REEs using experimental designs. The signal-to-background ratio (SBR) of the REEs emission signals and the Mg II/Mg I line intensity ratio were evaluated as response functions. According to the results obtained, three different sets of operating conditions were selected and classified as robust, semi-robust and best SBR conditions. Limits of detection (LOD), SBR and relative standard deviation of the blank solution (RSDblank) were determined. The semi-robust condition (RF power of 1250 W and nebulizer gas flow rate of 0.90 L min(-1)) exhibited lower LOD and RSDblank than others tested operating conditions.
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