|
| 
Jungfraujoch
-SO2-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
|
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Continuous |
| Sampling environment |
: |
measurements in pristine air, usually negligible local sources |
| Description for sampling analysis |
: |
Absorption in H2O2 and determination of sulfate with ion chromatography, daily values. (until December 2006)
Since January 2007, online UV fluorescence
|
| Instrument and Analysis |
| Measurement method |
: |
Ion chromatography (until December 2006)
UV fluorescence (since January 2007) |
| Current status and history of instrument |
: |
Ion chromatography (until December 2006)
UV fluorescence (since January 2007)
|
| Description of instrument |
: |
UV fluorescence:
January 2007 till 03 October 2011: TEI 43C TL (Thermo Environmental Instruments Inc.)
since 04 October 2011: TE 43i TLE (Thermo Scientific)
The instruments undergo comprehensive instrument tests and quality check after first receipt and before being installed at the measurement sites. In operation, instruments are replaced in regular intervals and are sent to manufacturer representatives in Switzerland for service such as cleaning and replacement of wear parts. This is again followed by standard quality checks / instrument tests at Empa. Standard operating procedures exist for the instrument tests, the regular on-site maintenance and daily and monthly data processing procedures. |
| Calibration |
| Current scale employed in the measurement |
: |
NMI PRM BH10 (10ppm ± 0.1ppm)
|
| Measurement calibration |
: |
until 31 Dezember 2006: for absorption in H2O2:
Once a year a stock solution of K2SO4, corresponding to 1000mg SO2/l, is made. Appropriate dilutions are prepared prior to each batch of analyses.
Since 1 January 2007 (UV fluorescence):
automatic zero and span checks every 49 hrs.; manual zero and span checks every two-three weeks
|
| Scale and calibration(treasability) |
: |
EMEP FOR ABSORRPTION IN H2O2;
FOR UV FLUORESCENCE:
Since 01/2007: NMI PRM BH10 (10ppm ± 0.1ppm); NMI is equivalent to NIST (refer to the “Declaration of Equivalence“ between NMI und NIST)
|
| Data Processing |
| Measurement unit |
: |
ppbv |
| Data processing |
: |
Since 1 January 2007 (UV fluorescence):
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 averages:
until 31 December 2006: 0.01 ppbv for values below 0.21 ppbv; 5 % for values greater than 0.21 ppbv.
UV fluorescence:
[2007-01-01 thru 2009-01-01] uncertainty = [(0.0829ppb)^2+(0.0307*c)^2]^0.5;
[2009-01-01 thru 2010-01-01] uncertainty = [(0.1051ppb)^2+(0.0298*c)^2]^0.5;
[since 2010-01-01] uncertainty = [(0.1063ppb)^2+(0.0301*c)^2]^0.5
|
| Data flag |
: |
|
| Data remarks |
: |
SD: If the SD is listed: Instead of the SD (standard deviation), the standard uncertainty is given.
|
| Other Information |
| Scientific aim |
: |
|
| Reference |
: |
|
|
| submitted by Swiss Federal Laboratories for Materials Testing and Research |
|
|
