The combination of Twister technology ( SBSE; Stir Bar Sorptive Extraction ) with elution and subsequent LC-detection can be powerful and reproducible process for the determination of organic analytes from aqueous samples; e.g. PAH, pesticides, herbicides or phenols.
The process was developed by UFZ Leipzig-Halle GmbH in close cooperation with GERSTEL.

Handling
Example: In order to extract PAH, 10 ml of the water sample to beanalysed are filled into a 10 ml vial, which contains the Twister. In order to extract the PAH, the Twister to stirs in the sample for 60 min at 1000 rpm at room temperature. Subsequently, the Twister is transferred into the designated conical glass insert of a 2 ml vial and the vial is closed. All further steps, such as the addition of eluting solution, shaking of the vials, removal of the extract and the subsequent injection into the LC are performed automatically by the GERSTEL MultiPurpose Sampler MPS.

The described process can also be use with GC technology.

Document:

Twister Back Extraction flyer (pdf)