Characteristics of Sulphur Dioxide Monitors: Intercomparison

Waldén, Jari; Lättilä, Heikki; Hyppönen, Mauri; Plathan, Pekka; Virtanen, Timo

doi:10.1007/978-3-642-75450-0_7

Cited by 1 publication

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the specifications of both SO2 monitors (ML8850 and AIG-2/S02), there are no remarkable differences between them. The detection limit for both monitors is almost the same: 1.6 ppb for ML8850 (Walden et al 1990) and 1 ppb for AIG-2 (Grooe et al 1990). Reproducibility and zero drift were not measured in a comparable way, but it has been shown that the AIG-2 is extremely stable (Grofle and Walden 1992).…”

Section: Generation Ofmentioning

confidence: 98%

“…In data analysis we used hourly average values, calculated from data sampled once a minute by the data acquisition system at the FMI (Walden et al 1990), and extracted from the recorder readings at the ZFI. The SO2 and NO, (= NO + NO*) concentrations are expressed as parts per volume.…”

Section: Generation Ofmentioning

confidence: 99%

“…The lower detection limit was calculated as 0.3 ppb for NOz at 0,5 % noise level. In comparison the LDL value for the ML8840 was defined as 1.8 ppb in Walden et al (1992). Figure 8 presents the data of the NO, channel of the ML8840 from the calibration runs made between 22 April and 7 May 1991, with the Wosthoff station operated with the NO2 source.…”

Section: No Measurementsmentioning

confidence: 99%

“…nitrogen oxides and sulphur dioxide monitors, have been reported in the literature (e.g. Holland and McElroy, 1986;Walden et al 1990). In this paper we report comparison measurements between the aerosol ionization gas analyser (AIG-2) modified for the detection of sulphur dioxide and nitrogen oxides in ambient air, and conventional SO2 and NO, monitors based on the UV-fluorescence and the chemiluminescence methods, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Detection of sulphur dioxide and nitrogen oxides by means of the ionization method: Comparison with the UV‐fluorescence method and the chemiluminescence method

Große¹,

Waldén²

1993

Environmetrics

Self Cite

View full text Add to dashboard Cite

Comparison measurements between the ionization gas analytical system (AIG-2) for detecting sulphur dioxide from ambient air and a monitor based on the UV-fluorescence method were performed. The experiments included both laboratory tests at two laboratories with different calibration devices, and field periods in two different cities. According to the laboratory tests the reproducibility of the AIG-2 was within 7.5 per cent over two years. During the first measurements the response ratio of the monitors was 1.5 on average for both laboratory and field measurements. After maintenance the response ratio was nearly 1.0 in the laboratory measurements and 0.9 in the field measurements. The drift of the AIG-2 was 0.89 per cent per month. In addition to the comparison of monitors, the stability of the AIG-2 also facilitates the comparison of different calibration methods between two laboratories. A maximum difference of 15 per cent and a minimum difference of 2 per cent between the output of the calibration devices of the two laboratories was found. We also discovered that the sample matrices of different calibration devices are different (e.g. moisture, inhomogeneities, particles), which can cause problems even when the calibration concentration is the same. As an example of the versatility Aerowlforschung, WIP/HEP-Gruppe, of the AIG-2 system we describe and discuss the relationship between an AIG-2 for the detection of nitrogen oxides and a chemiluminescence monitor.

show abstract

Section: Generation Ofmentioning

confidence: 98%

Section: Generation Ofmentioning

confidence: 99%

Section: No Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations