Pneumatic focusing gas chromatography
VOC Technologies has introduced the technique of pneumatic focusing gas chromatography (PFGC). It is a continuous speciated monitor for volatile organic compounds (VOCs) and hazardous air pollutants (HAPs).
The technique consists of compressing an air sample to high pressure (eg, 600 psi) before injecting it directly onto the column of a specially-designed gas chromatograph, also maintained at high pressure. Pressurisation serves to concentrate the sample, thereby increasing sensitivity, removing water vapour by condensation, and allowing ease of automation.
PFGC is a direct sampling method, which allows for minimal sample loss or interference in the focusing procedure.
The technique is designed to be contained entirely within a personal computer. Chromatography gases and samples enter the instrument through the back. Real-time observation of in-progress chromatograms can be carried out on a computer monitor on site and through an internet connection.
The optional front-mounted 6" monitor allows the PFGC to be operated without a standalone monitor, which is especially useful for field measurements.
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