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| 
Rigi
-NO2-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
|
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
1 minute |
| Sampling environment |
: |
|
| Description for sampling analysis |
: |
Air Intake: open-face, ambient |
| Instrument and Analysis |
| Measurement method |
: |
Chemiluminescence |
| Current status and history of instrument |
: |
Chemiluminescence, Molybdenum (Mo) converter |
| Description of instrument |
: |
[1991-05-23 thru 1992-11-24] ML8840 (Monitor Labs);
[1992-11-24 thru 2000-04-05] ML8841 (Monitor Labs);
[2000-04-05 thru 2003-01-01] ML9841A (Monitor Labs);
[2003-01-01 thru 2012-06-13] TEI 42C TL (Thermo Environmental Instruments Inc.);
Since 2012-06-13 Thermo 42i TL (Thermo Scientific);
|
| Calibration |
| Current scale employed in the measurement |
: |
NMI PRM BD11 (20ppm ± 0.2ppm)
|
| Measurement calibration |
: |
automatic zero and span checks every 25 hrs.; manual zero and span checks every 2 weeks; yearly check of converter efficiency using gas-phase titration |
| Scale and calibration(treasability) |
: |
From 1991 UNTIL 09/2001: NIST SRM 2629a (20ppm ± 0.2ppm);
Since 09/2001: NMI PRM BD11 (20ppm ± 0.2ppm); NMI is equivalent to NIST (refer to the “Declaration of Equivalence“ between NMI und NIST)
|
| Data Processing |
| Measurement unit |
: |
ppbv |
| Data processing |
: |
Quality assurance procedures involve time series plots, consistency checks. All aggregate calculations based on 10-minute aggregates with greater than 75% availability |
| Processing for averaging |
: |
Processing for Daily Data:
Estimated standard uncertainty for daily aggregates:
[1991-05-23 thru 2000-04-05] 1.1 ppbv below 16.1 ppbv, 6 % otherwise;
[2000-04-05 thru 2003-01-01] 0.9 ppbv below 18.8 ppbv, 5 % otherwise;
[2003-01-01 thru 2008-01-01] 0.08 ppbv below 1.6 ppbv, 5 % otherwise;
[2008-01-01 thru 2009-01-01] uncertainty = 2^0.5*[(0.0816 ppb)^2 + (0.0318 *c)^2]^0.5;
[2009-01-01 thru 2010-01-01] uncertainty = 2^0.5[(0.1291ppb)^2+(0.0320*c)^2]^0.5;
[since 2010-01-01] uncertainty = 2^0.5[(0.1291ppb)^2+(0.0341*c)^2]^0.5
Processing for Monthly Data:
Estimated standard uncertainty for monthly aggregates:
[1985-01-23 thru 1990-01-01] 1.1 ppbv below 16.1 ppbv, 5 % otherwise; |
| Data flag |
: |
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| Data remarks |
: |
SD: If the SD is listed: Instead of the SD (standard deviation), the standard uncertainty is given.
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| Other Information |
| Scientific aim |
: |
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| Reference |
: |
|
|
| submitted by Swiss Federal Laboratories for Materials Testing and Research |
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