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Improved flask-combustion method for phosphorus in petroleum products

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Summary

An electrical assembly for the oxygen-flask combustion of lubricants and similar petroleum products is described. The pyrolysis is performed in two consecutive steps. After the ignition and burning of the sample (sorbed on sodium carbonate) the combustion is completed by further heating. The sample weight should not exceed 140 mg. In this way the sensitivity of phosphorus determination of the tentative IP standard procedure is enhanced from 0.01 to 0.001% phosphorus if the volume of solution for the final spectrophotometric measurement is reduced.

Zusammenfassung

Ein elektrisches Gerät für die Verbrennung von Schmierölen und ähnlichen Erdölprodukten im Schöniger-Kolben wurde beschrieben. Die Pyrolyse erfolgt in zwei aufeinander folgenden Schritten. Nach der Entflammung der an Natriumcarbonat adsorbierten Probe und nach Erlöschen der Flamme erfolgt die vollständige Verbrennung von Einwaagen, die 140 mg nicht überschreiten. So konnte die Empfindlichkeit der Phosphorbestimmung nach der tentativen IP-Standardmethode von 0,01% auf 0,001% Phosphor gesteigert werden, wenn man die spektrophotometrische Messung mit vermindertem Lösungsvolumen durchführt.

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References

  1. IP Standards for Petroleum and Its Products, Part I: Methods for Analysis and Testing, Section 1 (1975); IP Method 149/73, p. 149/1–4.

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Authors and Affiliations

  1. INA Institute for Research and Development, Zagreb

    Z. Sliepčević, M. Široki &  Z. Štefanac

  2. Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Yugoslavia

    Z. Sliepčević, M. Široki &  Z. Štefanac

Authors
  1. Z. Sliepčević
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  2. M. Široki
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  3. Z. Štefanac
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Additional information

Herrn Professor Dr. H. Lieb zum 90. Geburtstag gewidmet.

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Sliepčević, Z., Široki, M. & Štefanac, Z. Improved flask-combustion method for phosphorus in petroleum products. Mikrochim Acta 69, 233–240 (1978). https://doi.org/10.1007/BF01201729

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  • DOI: https://doi.org/10.1007/BF01201729

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