NPL can provide purity services for gas standard producers, gas analysis laboratories and suppliers of hydrogen refuelling stations. We use a range of techniques (including gas chromatography and spectroscopy) to perform purity analysis of hydrogens samples according to ISO 14687-2:2012. Please note that some methods require higher volumes of gas sample.
| Impurity | ISO 14687 [µmol/mol] | Analytical method | Detection limit [µmol/mol] | Required amount of gas [L] |
|---|---|---|---|---|
| Water | 5 | Quartz crystal microbalance CRDS |
1.3 0.030 |
15 L 30 - 60 L |
| Total hydrocarbons | 2 | GC-Methaniser-FID | 0.1 | 2 L |
| Oxygen | 5 | GC-PDHID | 0.3 | 2 L |
| Helium | 300 | GC-TCD | 10 | 2 L |
| Argon Nitrogen |
100 | GC-PDHID | 0.3 1 |
2 L |
| Carbon dioxide | 2 | GC-Methaniser-FID | 0.02 | 2 L |
| Carbon monoxide | 0.2 | GC-Methaniser-FID | 0.02 | 2 L |
| Total sulphur compounds | 0.004 | GC-SCD | 0.001 | 1 L |
| Formaldehyde | 0.01 | GC-Methaniser-FID | 0.1 | 2 L |
| Formic acid | 0.2 | FTIR | 0.2 | 30 L |
| Ammonia | 0.1 | GC-MS UV-visible spectroscopy FTIR |
1 0.03 0.1 |
2 L 15 L 30 L |
| Total halogenated compounds (only organic halogenated compounds, excluding HCl and Cl2) |
0.05 | TD-GC-MS | 0.016 | 1.5 L |
We can also perform analysis of additional impurities to those listed above and in accordance with other standards (such as ISO 14687-1:1999 for hydrogen gas grids).
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Contact our Customer Services team on +44 20 8943 7070