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Gas Chromatography / Mass Spectrometry

Principle of Chromatography

Coupling Gas Chromatography to Mass Spectrometry improves a lot the compound identification and Detection sensitivity (ppb range).

When studying the outgassing of materials, the identification of outgassed compounds is often difficult with a direct Mass Spectrometry technique (like in IVA testing) : Generally, only the major compounds are identified.

The key advantage of Gas Chromatography is the separation of substances as they flow inside a capillary column. As shown in the picture above, all substances are injected into the column at the same time. They then pass through the column at various rates (depending on their mass and chemical properties). When sufficient chromatography is achieved, the detector "sees" the various substances in their pure form (not a mixed spectra). It is then possible to positively identify the unknown organic compounds through the use of standards and the NIST database.

This method can be applied to both hermetically sealed package and sealed glass ampoules.

Capillary Columns inside the GC Oven
Capillary Columns inside the GC Oven

ORS provides method development and routine mass spectrometry testing services to the Adhesive, Chemical, Electronics and Automotive Industries. The GC/MS technique is used to perform timely, qualitative and quantitative testing, which is customized to suit your analytical needs.

Please refer to the article Outgassing Species in Optoelectronic Packages for additional information