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| 
Rigi
-VOCs-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
5 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
2-hour |
| Sampling environment |
: |
rural environment |
| Description for sampling analysis |
: |
Air Intake: open-face, ambient |
| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (FID) |
| Current status and history of instrument |
: |
Measurements are performed since
2001 and are on-going.
The instrument was a
Gas chromatograph:
Varian 3600 (2001-08.2005)
Agilent (08.2005-ongoing)
The chromatographic column is a PLOT (KCl) column (50m x 0.53 mm)
2 L of air are trapped at -44 °C using an ADS system, as described by Simmonds et al. (Anal. Chem., 1995) |
| Description of instrument |
: |
|
| Calibration |
| Current scale employed in the measurement |
: |
NPL-30 VOC component mixture in the range of ~4 ppb |
| Measurement calibration |
: |
manually every 4 weeks |
| Scale and calibration(treasability) |
: |
the system was audited in 2005 by the WCC-VOC |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
Quality assurance procedures involve time series plots, consistency checks. |
| Processing for averaging |
: |
Processing for Daily Data:
Estimated standard uncertainty of single injections approx. 10 %; detection limit approx. 10 ppt
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| Data flag |
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| Data remarks |
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| Other Information |
| Scientific aim |
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| Reference |
: |
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| submitted by Swiss Federal Laboratories for Materials Testing and Research |
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