PRODUCT FOCUS: GERSTEL Automated Dynamic Headspace (DHS) Station
This edition of Product Focus takes a look at the GERSTEL Dynamic Headspace station compatible with the GERSTEL MultiPurpose Sampler MPS.
The DHS station is used to extract and concentrate VOCs from liquid or solid samples placed in standard headspace vials. The Dynamic Headspace (DHS) option for the GERSTEL MPS autosampler offers complete automation of the dynamic headspace technique.
The headspace above the sample is purged and analytes are concentrated on a user selectable adsorbent-filled trap. Analytes are subsequently introduced into a gas chromatographic system by thermal desorption of the trap in a GERSTEL Thermal Desorption Unit (TDU) resulting in maximum recovery, and lowest possible detection limits.
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 re-trapped. 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 when using the standard DHS option (right) or 3.5″ tubes when using DHS 3.5+ (left) combined with the GERSTEL TD 3.5+ thermal desorber.
Following analyte concentration, the tube is automatically transferred to the TDU or TD 3.5+ 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.
DHS offers improved performance for a wide variety of sample types, such as food, beverages, polymers, personal care products and pharmaceuticals. GERSTEL exclusive MAESTRO software enables fully integrated control of the complete process from extraction and analyte collection to GC/MS analysis. Just one method and one sequence table is required, minimising the risk of errors and enabling fastest possible set-up.
Intelligent software control ensures that the DHS process is performed during the GC run of the preceding sample, thereby optimising productivity and system utilisation, an exclusive GERSTEL feature.
Benefits of the GERSTEL Dynamic Headspace Station
- The GERSTEL Dynamic Headspace provides lower detection limits than static headspace, SPME and other widely used techniques
- High productivity through high throughput design and complete automation from sample preparation to GC/MS-analysis
- Highest flexibility: User defined extraction time, flow, temperature and adsorbent
- The Dynamic Headspace technology provides multiple water management options to ensure best chromatography and MS stability.
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