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Abstract

Some experimental procedures to validate a differential optical absorption spectroscopy (DOAS) instrument for simultaneous measurement of atmospheric pollutants have been set up at the Environment Institute of the JRC of Ispra. The instrument operates in field over an optical path of 178 m, while reference gas mixtures flow through optical cells placed in the optical beam in front of the spectrometer. The validation procedures allow for the control of the calibration and linearity of the instrument, as well as for its selectivity.
The experimental tests performed on an OPSIS instrument by variable concentration ranges of SO(2), NO(2), ozone, benzene, toluene and formaldehyde are described. Measurements of SO(2), NO(2) and ozone have been in good agreement with the reference mixtures, while a path length-dependent response has been observed for benzene and toluene. In the case of formaldehyde the large discrepancies observed suggest the need for further investigation.

Additional information

Authors: OTTOBRINI B, JRC Ispra (IT);NORIEGA GUERRA A, JRC Ispra (IT);DE SAEGER E, ;SANDRONI S,
Bibliographic Reference: EUR 16413 EN (1996) 52pp., FS
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
Record Number: 199610863 / Last updated on: 1996-09-16
Category: PUBLICATION
Original language: en
Available languages: en
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