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Pretreatment studies with biological and environmental materials

III. Pressure evaluation and carbon balance in pressurized decomposition with nitric acid

Probenvorbehandlungsstudien mit biologischen und Umweltmaterialien

III. Druckentwicklung und Kohlenstoffbilanz beim Druckaufschluß mit Salpetersäure

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Zusammenfassung

In zahlreichen biologischen und Umweltmaterialien wurde die Druckentwicklung in geschlossenen Teflongefäßen nach Salpetersäurezusatz und Erhitzung verfolgt. Dabei wurde ein deutlicher Einfluß der Matrix, des Temperaturprogramms und der Säuremenge auf den Druckverlauf beobachtet. Die mit Hilfe der Gas-Chromatographie ermittelte Kohlenstoffbilanz in einigen ausgewählten Materialien ergab in keinem Falle eine vollständige Veraschung und eine sehr starke Abhängigkeit der Aufschlußrate von der Art des untersuchten Materials.

Summary

In various biological and environmental materials the pressure pattern in closed teflon crucibles was followed after addition of nitric acid and heating. Hereby a significant influence of the matrix, of the temperature program and of the acid amount added on the pressure pattern was observed. The carbon balance, determined with the aid of gas-chromatography in several selected materials showed in no case a complete ashing and a very strong dependence of the decomposition rate on the kind of the investigated material.

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Authors and Affiliations

  1. Nuclear Research Center (KFA), Institute of Chemistry, Institute 4 Applied Physical Chemistry, P.O.B. 1913, D-5170, Jülich, Federal Republic Germany

    M. Stoeppler, K. P. Müller & F. Backhaus

Authors
  1. M. Stoeppler
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  2. K. P. Müller
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  3. F. Backhaus
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Additional information

Part I: Fresenius Z. Anal. Chem. 291, 116 (1978); Part II: Fresenius Z. Anal. Chem. 293, 127 (1978)

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Stoeppler, M., Müller, K.P. & Backhaus, F. Pretreatment studies with biological and environmental materials. Z. Anal. Chem. 297, 107–112 (1979). https://doi.org/10.1007/BF00483588

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  • DOI: https://doi.org/10.1007/BF00483588

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