Journal of the Brazilian Chemical Society (Jan 2003)

Determination of fluoride in coal using pyrohydrolysis for analyte separation

  • Dressler Valderi L.,
  • Pozebon Dirce,
  • Flores Éder L. M.,
  • Paniz José N. G.,
  • Flores Érico M. M.

Journal volume & issue
Vol. 14, no. 2
pp. 334 – 338

Abstract

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

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