Determination of Metal Loading in Heterogeneous Catalyst by Slurry Sampling Flame Atomic Absorption Spectrometry
AUTOR(ES)
Garcia, Marco A. S., Silvestre, Daniel M., Nomura, Cassiana S., Rossi, Liane M.
FONTE
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
2015-02
RESUMO
Quantification of metal loading in supported catalysts is imperative; however, the analytical methods are usually time-consuming, expensive, and require sophisticated equipment and sample extraction with hazardous and corrosive strong acids. Herein, we report a new method for quantification of metal in supported catalysts using slurry sampling flame atomic absorption spectrometry. The slurry sampling method was used for determination of gold and the results were similar to those obtained with the traditional extraction method using aqua regia; however, it overcomes the main drawbacks associated with sample digestion by avoiding the use of concentrated toxic reagents, minimizing sample manipulation, and consequently, reducing the risks of contamination and the sample preparation time. Ultrasound radiation optimization associated with the solvent, mass of sample, concentration, and matrix effect in the slurry analysis allowed direct analysis by using the calibration in aqueous medium. The slurry sampling procedure could be applied to other catalysts with different supports and in bimetallic systems.
Documentos Relacionados
- Direct analysis of Antarctic krill by slurry sampling: determination of copper, iron, manganese and zinc by flame atomic absorption spectrometry
- Slurry sampling for arsenic determination in sediments by hydride generation atomic absorption spectrometry
- Bioaccessibility of Zinc from Yogurt and Determination of Total Concentration Using Slurry Sampling and Flame Atomic Absorption Spectrometry
- Direct solid sampling by flame atomic absorption spectrometry: determination of manganese in coal samples
- Field sampling system for determination of cadmium and nickel in fresh water by flame atomic absorption spectrometry