Determination of fluoride in coal using pyrohydrolysis for analyte separation

被引：43

作者：

Dressler, VL ^{[1
]}

Pozebon, D

Flores, ÉLM

Paniz, JNG

Flores, ÉMM

机构：

[1] Univ Fed Santa Maria, Dept Quim, BR-97105900 Santa Maria, RS, Brazil

[2] Univ Fed Rio Grande Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2003年 / 14卷 / 02期

关键词：

coal; fluoride; pyrohydrolysis; ion electrode; vanadium pentoxide; catalyst;

D O I：

10.1590/S0103-50532003000200024

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 μgF/g of sample, using 20 mg of sample and a final dilution to 10 mL. The sample frequency was 5 samples h(-1).

引用

页码：334 / 338

页数：5

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