By Suzanne Couling
This quantity examines dimension of ambient pollution in rain, airborne dirt and dust, aerosols and gases. tools of sampling, research and calibration are in comparison often by way of sensible research
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1 shows the location of Opsis with respect to the sampling inlet of the other analysers housed on the Stevenage site. All instruments were operated at the site between January and June 1990 although the Opsis analyser remained in operation until September. 2 Strath Vaich monitoring site WSL have an established air pollution monitoring site in a remote part of northern Scotland, near to the Strath Vaich Dam. The site is located on exposed and slightly elevated (270 m above sea level) moorland. There are negligible sources of local pollution and the site is prone to prevailing westerly winds that bring in clean air from the Atlantic.
The overall objective of this project was therefore to evaluate and compare three new low-level N 0 2 analysers, each employing a different measurement principle, with a view to selecting a preferred method for use in remote rural areas. The instruments under evaluation were a gas phase chemiluminescent analyser (Teco 42), a liquid phase luminol chemiluminescent N 0 2 analyser (Luminox), and a differential optical absorption spectrometer (Opsis). These analysers were also compared with a conventional chemiluminescent analyser (ML 8840) of the type commonly used in urban monitoring networks.
The main operational problem found was that the control unit did not apparently indicate the correct filter loading. This problem is being investigated by the manufacturer. The filters should last for up to a month, although, during periods of high ambient concentrations, it was found that they became fully loaded in less than a week. The manufacturers have now modified the instrument so that, by altering the ratio of the sample flow to the bypass flow, a sample flow of 1 lmin - 1 can be used. This modification, which is intended to increase filter life, is currently being tested.
Measurement of Airborne Pollutants by Suzanne Couling