Trace Impurities in High Purity Hydrogen
In trace level detection, a critical aspect of detector performance is how quickly it recovers from the matrix peak. Many detectors are rendered inoperative until all of the matrix has left the ionization region of the detector. Since the discharge gas in the PDD is separate from the carrier stream, the bulk of the matrix peak never enters the discharge region, resulting in a speedy recovery.
Courtesy of Unicam Chromatography, B. Lawrence and M. J. C. Smith
| Run conditions | ||
|---|---|---|
| Sample | 1 ml bulk hydrogen | |
| Injector temp | 100°C | |
| Detector mode | Helium photoionization | |
| Discharge gas | Helium @ 30 ml/min | |
| Dopant gas | None | |
| Detector temp | 100°C | |
| Columns | Stripper | 0.5 m x 1/8" Silica gel |
| Heartcut | Molesieve 5Å, 1 m x 1/8" | |
| Analysis | Molesieve 5Å, 2 m x 1/8" | |
| Column temp | 80°C | |
