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How can I prevent high air/water background when using a thermal desorber with GC–MS analysis?

Markes’ thermal desorbers use high-quality O-rings to create a strong seal around the sample tubes and cold trap, and therefore the air/water background should be similar to that observed with conventional GC injector systems.

However, as with all split GC injectors it is recommended that a flow of at least 10 mL/min is maintained through the split vent when the system is in standby, to prevent back-diffusion of air through the split. Markes’ TD software provides a ‘Split on in Standby’ option to facilitate this, and should give acceptable air/water levels.

Note that other thermal desorption systems may automatically switch the split flow off during analysis, leading to high air/water levels when the system has been in standby for some time.

UK
UK
Markes International Ltd
Gwaun Elai Medi-Science Campus
Llantrisant
RCT, CF72 8XL
UK
Tel: +44 (0)1443 230935
Germany
Germany
Markes International GmbH
Bieberer Straße 1–7
63065 Offenbach am Main
Germany
 
Tel: +49 (0)69 6681089-10
USA (West)
USA
Markes International, Inc.
2355 Gold Meadow Way
Gold River, Sacramento
California 95670
USA
Tel: +1 866-483-5684 (toll-free)
China
China
Markes Instruments (Shanghai) Co., Ltd
No. 1 Building, No. 7 Guiqing Road
Xuhui District
Shanghai 200233
P.R. China
Tel: +86 21 5465 1216
Part of Schauenburg International
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