Analysis of Volatile Organic Compounds (VOC) (2)

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Active collection: Adsorption on an adsorbent by use of a pump

<Adsorption tube collection method>
A sample is collected into a collection tube filled with an adsorbent.
After collection, the sample is analyzed by TCT-GC-MS.
(Means of adsorption: Thermal adsorption)

  • Concentration can be known from collection from the air.
  • Collection of high-polarity compounds
  • Analysis of siloxanes is possible.

Example of collection:
A collection tube connected to a collection pump is set in the clean room.
Air is collected at 0.2mL/min for 30 min. and analyzed by TCT-GC-MS.

Indoor and various other materials

Passive collection: By utilizing molecular diffusion of the target substance without using power.

Head Space Sorptive Extraction (HSSE) method:
This is a method for collecting the target component onto a stirring bar coated with PDMS (polydimethyl siloxane). After collection, it is analyzed by TCT-GC-MS.
(Means of desorption: Thermal desorption)

  • All of collected matter can be introduced.
  • Little contamination or low-boiling component loss.
Sample is put in a vial, and the collected matter is set in the head space and allowed to stand for several hours. Collected matter is put in a closed space (room, case, etc.) and allowed to stand for several hours (making it possible to collect outgas that is produced from the inside of the case).

VOA concentration and collection in water

  Concentration collection Adsorption
method
Characteristics
Solid layer extraction Collection onto adsorbent (silica into which octadecyl group has been introduced) Solvent extraction
  • Part of extraction solvent is introduced into GCMS.
Purge & trap To be dispelled by bubbling with inert gas and collected into adsorbent tube. Thermal desorption
  • All the amount can be introduced into GC-MS.
  • Little contamination or low-boiling component loss
SBSE A method under which a stirring bar coated with PDMS (polydimethyl siloxane) is stirred in sample solution and the target component is extracted. (Refer to the diagram on the right side.)
(Liquid-liquid distribution theory is applied.)
Thermal desorption
  • All of collected matter can be introduced into GC-MS.
  • Little contamination or low-boiling component loss
  • There is a background of cyclic dimethylsiloxane/

SBSE method (image)

After approx. 1 hour of agitation, the object is dehydrated well and subjected to TCT-GCMS analysis.

Search Number 7007

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