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Markes’ SPE-tD cartridges offer a simple, convenient method for sampling less volatile impurities in aqueous samples – applications which would otherwise require manually-intensive extraction or distillation techniques before GC(MS) analysis. Applications include:
- Off-odours/taints in drinking water
- Semi-volatiles in processed fruit juices
- Profiling of hydrosols (aqueous fraction from steam distillation of natural oils)
SPE-tD cartridges comprise a hollow tube, coated inside and out with polydimethyl siloxane (PDMS) for optimum sampling capacity. The cartridge is placed into the sample and agitated, causing volatile and semi-volatile organics in the sample to partition between the aqueous matrix and PDMS and reach an equilibrium. The cartridge is then removed, rinsed and
placed into an empty TD tube prior to analysis by direct TD-GCMS. This allows semi-quantitative analysis of less volatile organics and direct comparison of organic impurity levels in two similar samples.
Please note: Tubes and caps must be purchased separately.
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