Dynamic Headspace
Automated Dynamic Headspace DHS is available for the GERSTEL MultiPurpose Sampler MPS. The DHS station efficiently extracts and concentrates VOCs from liquid or solid samples placed in standard Headspace vials. The sample is thermostated and agitated while the headspace is purged with a controlled flow of inert gas, providing controlled and efficient extraction conditions. Sample temperatures can be selected from 10 °C to 200 °C. Lowering the temperature provides a means of reducing the amount of water vapor released and ultimately retrapped. The DHS station additionally holds a replaceable adsorbent- or sorbent filled tube used for analyte concentration. The temperature of the adsorbent tube during the DHS process can be varied from 20 °C to 70 °C for optimal trapping of the analytes in question. Adsorbent tubes used are standard GERSTEL Thermal Desorption Unit TDU tubes. Following analyte concentration, the tube is automatically transferred to the TDU for Thermal Desorption and analyte transfer to the GC. Tubes are fitted with individual adapters enabling both automated movement and leak-free sealing during the Dynamic Headspace and Thermal Desorption steps and during storage in the autosampler tray.
Automated Dynamic Headspace DHS combined with sample introduction to a GC or GC/MS system is performed by the MPS and TDU. Up to 98 samples can be processed automatically in one sequence.
Dynamic Headspace benefits:
Low detection limit- Reliable and reproducible
- High productivity through high throughput design
- Highly flexible
- Solvent free extraction
- Multiple water management options
- Convenient, user friendly operation
The DHS process, from extraction to sample introduction.
The DHS station provides sample thermostating and agitation combined with purging of the sample headspace with a controlled flow of inert gas. Extracted compounds are trapped and concentrated on a replaceable adsorbent-filled trap, which is subsequently thermally desorbed in the integrated Thermal Desorption Unit TDU followed by determination of the analytes using GC/MS. While in the GERSTEL MPS autosampler, samples are stored in standard headspace vials at ambient temperature. Optionally, samples can be stored at controlled temperatures between 4 °C to 200 °C. During extraction, samples can be agitated to enhance and speed up the extraction process. The temperature of the adsorbent tube during the DHS process can be independently controlled from 20 °C to 70 °C for optimal trapping of the analytes of interest. The adsorbent tube can be dry purged for water removal to ensure the best possible chromatography and MS stability. A new adsorbent tube can be used for every sample, eliminating the risk of cross contamination or the same tube can be used for multiple samples as in standard Purge and Trap instruments.
Dynamic-Headspace-DHS Brochure
Product Specifications