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Leba
-NO2-
| Observation |
| Category |
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Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
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UTC |
| Sampling |
| Sampling height |
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+3.0 |
| Description |
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continuous |
| Sampling and analysis frequency |
: |
Sampling is done in daily intervals. |
| Sampling environment |
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The station is located in coastal region at the border of "Slowinski National Park" between Lebsko Lake and Leba River. The station is surrounded by woods and meadows. The Baltic sea shore line is 2km to the north.Summer seaside resort is 3km to the east.
Gdansk (big city with about 1 mln inhabitants) is situated 80km to the SE direction.
Slupsk (city with about 100 thousand inhabitants) is located 50 km to the SW direction.
Lebork (city with about 30 thousand inhabitants) is located 30 km to the S direction.
The prevailing winds are usually from W,SW and NE directions.
In 2009 and 2010 the prevailing winds were from E and NE directions
but in 2011 and 2012 were again from NW and SW directions. In 2013 the prevailing winds were from N, NE, E and in 2014 this directions were from S, SE. |
| Description for sampling analysis |
: |
A manual low-volume sampler for NO2 measurement is used. Sampling inlet has quadratic cross-section (9x9cm)and is 15cm high.
It is made of PE and mounted at the height of 4.5m above the ground level.The total length of teflon tubing (ID=6mm) is 2.5m.
Starting from April 24,2012 the inlet is mounted at the height of 3.1m above the ground level and the total length of teflon tubing (ID=6mm) is 3.9m. The air flow rate is still 0.5l/min and total volume of the daily sample amounts to 0.7m3.
A precision wet gas meter was used for measuring the sampled air volume until May 1994.
Since then the air flow rate has been adjusted with use of a mass flow rate controller (ERG1000) calibrated by the producer once a year. Absorption efficiency is 80%.
The collected daily samples are stored in a refrigerator.
Analyses are performed in monthly series. |
| Instrument and Analysis |
| Measurement method |
: |
Light absorption analysis (VIS) |
| Current status and history of instrument |
: |
Spectrophotometer Specol 11 made by Carl Zeiss, Jena (German Democratic Republic)was used until 1995.
Since then Hitachi spectrophotometer model U-1100,serial no. 0691-010 has been used. |
| Description of instrument |
: |
Spectrophotometer made by HITACHI, model U-1100 enables to achieve:
- analytical precision expressed as relative standard deviation (RSD):
1% at 0.304mgN-NO2/l
5.9% at 0.015mgN-NO2/l
- analytical detection limit: 0.008mgN-NO2/l
- measurement detection limit: 0.2µgN-NO2/m3 |
| Calibration |
| Current scale employed in the measurement |
: |
Scale of standards is prepared at the IMWM laboratory for each monthly series of collected daily samples. |
| Measurement calibration |
: |
Spectrophotomerical analytical method is calibrated with use of standard nitrite solutions having the concentrations in the range of 0.0 - 1.5µgNO2/ml when each monthly series of collected daily samples is analysed.
The calibration curve includes from 8 to 10 points.
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| Scale and calibration(treasability) |
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Daily NO2 concentrations measured at the regional background air pollution monitoring station are below 50µgNO2/m3. Annual mean NO2 concentration calculated from the daily averages is much below 40µgNO2/m3, i.e. the admissible value adopted in the disposition by the Ministry of the Environment (August 2012) as regards health protection.
Taking part in yearly EMEP laboratory intercomparisons of NO2 determination in several samples of synthetic aqueous solutions prepared by EMEP/CCC/NILU, Norway.
The detailed information and data on the quality assurance/quality control are presented on website:
www.nilu.no/projects/ccc/qa/index.htm
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| Data Processing |
| Measurement unit |
: |
µg/m3-20C, 1013hPa |
| Data processing |
: |
When the measured NO2 concentration is beyond the upper limit of the liner range of the calibration curve, the sample is appropriately diluted and reanalysed.
The raw daily data are stored in the data book and the data acquisition system.
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| Processing for averaging |
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Processing for Daily Data:
If the measured value is below the measurement detection limit i.e. 0.2µgN-NO2/m3, the half of this value is assumed.
Then the data are correlated with the meteorological data and with the information from the station logbook and other sources.
All incorrect and invalid daily data are rejected and marked according to the codes specified in Data Reporting Manual, WDCGG, No.1, January 1991.
Processing for Monthly Data:
Arithmetic mean monthly values are calculated from valid daily data
and marked according to the codes specified in Data Reporting Manual, WDCGG, No.1, January 1991. |
| Data flag |
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Flags specified by WDCGG in Data Reporting Manual (WDCGG No1, January 1991) are used. |
| Data remarks |
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| Other Information |
| Scientific aim |
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To provide data for research and study to reveal long term trends in background NO2 concentrations in Poland in the framework of EMEP programme. The data are also used for the Polish State Environmental Monitoring System. |
| Reference |
: |
-"The EMEP Monitoring Strategy 2010-2019".
- EMEP Manual for Sampling and Chemical Analysis, EMEP/CCC-Report 1/95, O-7726, Norwegian Institute for Air Research
-web site addresses:
www.emep.int/emep_title.html
www.nilu.no/projects/ccc/index.html
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| submitted by Institute of Meteorology and Water Management |
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