Thermal desorption of the Twister in the Thermal Desorption Unit TDU

Twister desorption via TDU

The GERSTEL Thermal Desorption Unit TDU is a highly flexible instrument for thermal desorption and thermal extraction. The TDU is perfectly suitable for Twister desorption.

The Thermal Desorption Unit TDU mounts directly onto the Cooled Injection System CIS, eliminating the need for a transfer line. The Twister desorption liner mates directly with the glass inlet liner of the CIS—this novel liner-to-liner design prevents analytes from contacting active sites and thus provides a completely inert sample path. The patented Twister is a magnetic stir bar that has been coated with a partitioning phase of polydimethylsiloxane (PDMS). While it is stirring the sample solution, Twister efficiently extracts organic components from aqueous or other liquid samples. After extracting analytes from sample solution, each Twister is placed into a sealed TDU liner. Prior to insertion of the Twister into the TDU, GC column head pressure is reduced to zero to prevent back-flush of sample or damage to the column. Transfer into the TDU is performed manually using a specifically designed transport ”pen”, or automatically with the MultiPurpose Sampler MPS.