Fresenius' Zeitschrift für analytische Chemie

, Volume 319, Issue 5, pp 556–559 | Cite as

Ion-chromatographic determination of fluorine in texas lignite

  • D. Chakraborti
  • D. C. J. Hillmann
  • R. A. Zingaro
  • K. J. Irgolic
Original Papers

Summary

Samples of approximately 1.0 g were taken from three Texas lignite cores and mineralized in oxygen bombs. The residue was dissolved in distilled water to a total volume of 50 ml. The resulting solutions were analyzed for fluoride by ion chromatography and with a fluoride-sensitive electrode. The results obtained with these two methods were in good agreement. The pH of solutions prepared from mineralized lignite samples must be adjusted to fall into the range 4 to 12 before fluoride is determined by ion chromatography. The calibration curve is linear to 10 mg/l F (in solution). Twenty μg/l of F (in solution) corresponding to 1 mg/kg of dry lignite can still be determined. Ion chromatography has higher sensitivity for fluoride than fluoride-sensitive electrodes and provides at the same time information about other anionic species. The fluorine concentrations in the three cores varied from 10 to 140 mg/kg (dry lignite). Layers of clay interspersed between the lignite seams had higher fluorine concentrations than the lignite.

Keywords

Fluorine Lignite Coal Sample Fluoride Concentration Fluorine Concentration 

Ionen-chromatographische Bestimmung von Fluor in Braunkohle aus Texas

Zusammenfassung

Braunkohlenproben von etwa 1 g wurden in der Sauerstoffbombe mineralisiert, der Rückstand in Wasser gelöst und die Lösung mit Hilfe der Ionen-Chromatographie und mit einer fluoridsensitiven Elektrode auf Fluorid untersucht. Die mit beiden Methoden erhaltenen Ergebnisse stimmten gut überein. Vor der Ionen-Chromatographie müssen die Lösungen der mineralisierten Proben auf pH 4–12 eingestellt werden. Die Eichkurve verläuft bis 10 mg/l F linear. Noch 20 μg/l F (in Lösung), entsprechend 1 mg/kg trockener Braunkohle, können bestimmt werden. Die Ionen-Chromatographie weist eine höhere Empfindlichkeit auf als fluorid-sensitive Elektroden und bietet darüber hinaus Information über andere Anionen. Die untersuchten Fluoridkonzentrationen lagen zwischen 10 und 140 mg/kg (trockene Braunkohle). Zwischengelagerte Lehmschichten wiesen höhere Fluorgehalte auf.

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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • D. Chakraborti
    • 1
    • 3
  • D. C. J. Hillmann
    • 1
  • R. A. Zingaro
    • 1
  • K. J. Irgolic
    • 2
  1. 1.Department of ChemistryTexas A & M UniversityTexasUSA
  2. 2.Texas A & M University Coal and Lignite Research LaboratoryTexas A & M UniversityTexasUSA
  3. 3.Jadavpur UniversityCalcuttaIndia

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