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- W1968768335 abstract "Road side aerosols were sampled on a high trtic density road in Colchester during 20 October 1997 to 3 1 January 1998. The sampling was performed over 48 hour periods with an annular denuder-filter system and May cascade impactor. Gaseous species SOZ, HNO3, HONO, NH3 and water soluble ions of ambient aerosols, anions ( SO:‘, NO; and CT ) and cations ( Nl%‘, Na’, K’, Mg” and Ca2’ ), have been investigated. An OPSIS system was operated opposite the sampling site at 10 m above ground level by Colchester Borough Council. Mean values of measured gases and particle concentrations over this period are shown in Table 1. Compared with the OPSIS data, lower values of sulphur dioxide were found with an average ratio 4.0. The two data sets showed a good correlation (r=O.85). Only ammonium and nitrate exhibited a good correlation. However, as shown in a typical size distribution, sulphate, nitrate and ammonium well correlate with each other in the line mode (Figure 1). This suggests that ammonium sulphate, ammonium nitrate and sodium nitrate were the main fine components. PMio data was available during 22 October to 13 November 1997 and nitrate was found to be well correlated with PM,0 during this period. ____________-______----------------------------------------------------------------------------------SO2 HN03 HONO HCl NH3 NH4+ Na’ K’ Me Ca2+ SOd2NO, ClTSP 5.2 0.9 1.1 1.1 3.0 1.4 1.2 0.2 0.1 0.5 2.8 2.6 0.7 32.5 _________________-__---------------------------------------------------------------------------------Table 1. Mean concentrations in ug/m3 of measured gases, ionic species and total suspended particulate(TSP)." @default.
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- W1968768335 date "1998-09-01" @default.
- W1968768335 modified "2023-09-26" @default.
- W1968768335 title "Ambient aerosol measurements at the road side" @default.
- W1968768335 doi "https://doi.org/10.1016/s0021-8502(98)90533-x" @default.
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