Found 10076 publications. Showing page 338 of 404:
Calibration and assessment of electrochemical low-cost sensors in remote alpine harsh environments
This work presents results from an original open-source low-cost sensor (LCS) system developed to measure tropospheric O3 in a remote high altitude alpine site. Our study was conducted at the Col Margherita Observatory (2543 m above sea level), in the Italian Eastern Alps. The sensor system mounts three commercial low-cost O3/NO2 sensors that have been calibrated before field deployment against a laboratory standard (Thermo Scientific; 49i-PS), calibrated against the standard reference photometer no. 15 calibration scale of the World Meteorological Organization (WMO). Intra- and intercomparison between the sensors and a reference instrument (Thermo Scientific; 49c) have been conducted for 7 months from May to December 2018. The sensors required an individual calibration, both in laboratory and in the field. The sensor's dependence on the environmental meteorological variables has been considered and discussed. We showed that it is possible to reduce the bias of one LCS by using the average coefficient values of another LCS working in tandem, suggesting a way forward for the development of remote field calibration techniques. We showed that it is possible reconstruct the environmental ozone concentration during the loss of reference instrument data in situations caused by power outages. The evaluation of the analytical performances of this sensing system provides a limit of detection (LOD) <5 ppb (parts per billion), limit of quantification (LOQ) <17 ppb, linear dynamic range (LDR) up to 250 ppb, intra-Pearson correlation coefficient (PCC) up to 0.96, inter-PCC >0.8, bias >3.5 ppb and ±8.5 at 95 % confidence. This first implementation of a LCS system in an alpine remote location demonstrated how to obtain valuable data from a low-cost instrument in a remote environment, opening new perspectives for the adoption of low-cost sensor networks in atmospheric sciences.
2021
Calibration and application of a passive air sampler (XAD-PAS) for volatile methyl siloxanes. NILU PP
2013
2013
Calculations of Radiative Forcing from Ozone Change. NATO Science Series, vol. 557
2000
Calculations of personal exposure to particulate matter in urban areas. Developments in environmental science, 6
2007
Calculations of loads and concentrations of hazardous substances in the Barents Sea and the Lofoten area, 2012. NIVA-rapport, 6544-2013
2013
2004
2007
Calculation of pseudo PM2.5 annual mean concentrations in Europe based on annual mean PM10 concentrations and other supplementary data. ETC/ACC Technical Paper, 2010/9
2011
2005
Calculation of person-weighted average concentrations of NO2, PM10 and PM2,5 in Oslo for 1992-2002. NILU F
2005
Calculation of person-weighted average concentrations of NO2, PM10 and PM 2,5 in Oslo for 1992-2002. NILU PP
2005
Calculation of dispersion and deposition, April 2010 - April 2011. NILU OR
NILU - Norwegian Institute for Air Research has calculated concentrations of NO2, SO2, and PM10 resulting from emissions from Hammerfest LNG and related shipping. Also emissions deposition of nitrogen and sulphur have been calculated. Calculations show that concentrations of NO2 may exceed the thresholds recommended by the Norwegian State Pollution Agency, but not the EU limit values nor National target values. There are no exceedances of SO2 or PM10 limit values. Calculations give a maximum yearly deposition of 14 mg N /m2 and 11 mg S /m2.
2012
2011