Intercomparison between gas-chromatography and long-path UV DOAS techniques for the measurement of benzene and toluene in urban atmospheres

Ivo Allegrini; Antonio Febo

doi:10.1117/12.210798

31 May 1995 Intercomparison between gas-chromatography and long-path UV DOAS techniques for the measurement of benzene and toluene in urban atmospheres

Ivo Allegrini, Antonio Febo

Author Affiliations +

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210798
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

An intercomparison between DOAS and gas-chromatographic techniques for the measurement of the concentration of benzene and toluene in the air has been carried out in Milan, Italy during the winter of 1994. Measurements of the natural radioactivity due to Radon have been carried out for a direct description of the mixing properties of the atmosphere. The temporal trend of primary pollutants, including hydrocarbons, follow, as expected, that of radioactivity. The results show that large discrepancies between the two methods have to be associated with the stratification of the atmosphere caused by ground based inversions. Scatter plots of GC against DOAS data show acceptable agreements, while the nature of observed offsets in DOAS system need further investigation. The results also show that the measurements are self consistent as they fit the physio-chemical evolution of atmospheric pollution at the site of sampling. In addition, data obtained from DOAS may be used to describe the evaluation of vertical mixing through the ratio toluene/benzene. Data on this new and important aspect are also presented.

Citation Download Citation

Ivo Allegrini and Antonio Febo "Intercomparison between gas-chromatography and long-path UV DOAS techniques for the measurement of benzene and toluene in urban atmospheres", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210798

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