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The Chemical Educator

, Volume 4, Issue 4, pp 141–143 | Cite as

Preparing Accurate Standard Gas Mixtures of Volatile Substances at Low Concentration Levels

  • A. UyanikEmail author
  • N. Tinkiliç
Laboratories and Demonstrations

Abstract

A simple approach for preparing standard gas mixtures of environmentally important volatile organic substances for gas chromatographic calibration is described. A liquid solution of the volatile substance of interest in a suitable solvent is prepared in a flask at known low concentration. Then, an easily measurable volume of this solution containing a very minute amount of the analyte is injected into a fixed-volume vessel (e.g., a glass sampling bulb) that has been flushed with a dilutent gas (e.g., air, N2, He). The generated gas-phase concentration of the substance after evaporation is easily calculated. This method allows students to prepare standard gas-phase mixtures at very low concentrations by direct injection of extremely small amounts into solution using a reasonable size microsyringe.

Keywords

Concentration Level Organic Substance Measurable Volume Simple Approach Direct Injection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York, Inc. 1999

Authors and Affiliations

  1. 1.Ondokuz Mayis UniversityKurupelitSamsunTurkey

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