Determination of fluoride in coal using pyrohydrolysis for analyte separation

Journal of the Brazilian Chemical Society

Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil¹  Flores, Érico M. M.¹  Paniz, José N. G.¹  Flores, Éder L. M.¹  Pozebon, Dirce¹  Dressler, Valderi L.¹  Universidade Federal de Santa Maria, Santa Maria, Brazil¹ 

关键词: coal;    fluoride;    pyrohydrolysis;    ion electrode;    vanadium pentoxide;    catalyst;   

DOI  :  10.1590/S0103-50532003000200024

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

A method for the determination of fluoride in coal using pyrohydrolysis for sample decomposition is proposed. An apparatus was constructed, and the influence of vanadium pentoxide (V2O5) as a catalyst for the pyrohydrolysis reaction was investigated. It was verified that V2O5 does not influence the release of fluoride from coal. Certified and non-certified samples were analysed using an ion selective electrode (ISE) for analyte detection. Precise (RSD < 7%) and accurate (recovery in accordance with certified values) results were obtained. The limit of quantification (LOQ) of the method was 5.0 mgF/g of sample, using 20 mg of sample and a final dilution to 10 mL. The sample frequency was 5 samples h-1.

【 授权许可】

Unknown