Analysis of Volatile Organic Compounds (VOC) (1)

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Summary

Volatile organic compounds are called VOC, or VM (volatile materials). VOC is extracted from a sample and concentrated and collected. It is analyzed by gas chromatography-mass spectroscopy (GC-MS). There are many techniques available for the collecting methods, and a proper method will be proposed to suit the purpose.

Thermal extraction (thermal desorption) – dynamic head space (DHS)

The method under which a sample is heated in the helium current, and the volatile component thus produced is cooled and collected (cryofocused) with liquid nitrogen and then introduced into the gas chromatograph (GC) after being rapidly heated.

  • Introduction of all of generated gas is possible ⇒ Suitable for trace-amount analysis
  • Absolute quantitative determination is possible in some cases.

Thermal extraction (thermal desorption) – Static head space (SHS)

The method under which a sample is put into a vial 10 or 20ml), sealed and heated at constant temperature for a given time, and part of the gas phase (head space section) in the vial that has reached gas-solid equilibria is introduced into GC.

  • Suitable for relatively low-boiling components
  • If heating temperature is controlled, water as a sample can be analyzed.

Search Number 7006

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