Internal Standards and Dry Purge
ISDP
Internal Standards and Dry Purge
The GERSTEL ISDP and ISDP⁺ can spike each thermal desorption tube with a known, fixed amount of gas or liquid standard; then, each tube is purged with a drying gas to remove water captured in the tube when humid air is sampled or solvent if the tube is spiked with liquids.
ISDP
The GERSTEL ISDP provides precise, reproducible, and fully automated
addition of
gaseous internal standards using GERSTEL TD 3.5⁺ tubes and other 3.5” tubes delivered via a high-precision regulator and a fixed volume loop. This addition of gaseous internal standards isoften recommended in methods for air analysis, such as US EPA TO-17. In addition to adding
internal standards, the GERSTEL ISDP also utilizes a mass
flow controller for precise and reproducible dry purging of the tube in the sampling direction to remove water from humid
air samples. The ISDP can spike each tube with a known,
fixed amount of internal standard gas and/or purge each tube with a drying gas to eliminate water captured in the
tube when humid air is sampled.
Main Features and Advantages
- Intuitive, easy-to-use
- Mass flow control greatly improves reproducibility compared to needle-valve based approaches
- Complete software integration
- Modular design, easy to add capabilities
- Comprehensive offering of automation options
