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• W2040396951 abstract "A l'aide d'un réseau de 7 postes à Rouen, on a étudié la transformation de l'anhydride sulfureux en acide sulfurique pendant l'hiver 1969/70. Par “dacide sulfurique” on entend le H2SO4 dosé par la méthode spécifique de microdiffusion, et non la concentration en ions H+ ou en sulfates. La transformation est dominée par l'effet catalytique de l'aérosol solide se trouvant simultanément en suspension. A côté de cette influence, l'effet accélérateur du NH3 n'apparaît que peu, celui du NO2 est encore plus flou. La réaction photochimique ne se laisse pas entrevoir. L'effet net du brouillard conduit plutôt à une diminution de la concentration de l'acide sulfurique en suspension. Dans les conditions étudiées, on peut estimer que la vitesse de transformation se situe entre 6 pour cent h−1 and 25 pour cent h−1. En moyenne, on constate que 7,1 pour cent du soufre se retrouve en hiver à l'état de H2SO4 dans l'atmosphère de la région rouennaise. The atmospheric oxidation of sulphur dioxide to sulphuric acid aerosol was studied during the winter of 1969/70 at seven sites in the Rouen region. By sulphuric acid we understand only the H2SO4 determined selectively by the microdiffusion method and not the stochiometric values computed from hydrogen ion or sulphate concentrations. The reaction is governed by the catalytic action of the suspended solid matter. Compared with this influence, the acceleration of the reaction by NH3 appears slight and the action of NO2 seems even less definite. No photochemical action is perceptible. The overall effect of fog is rather a diminution of the H2SO4 aerosol concentration. Under the observed conditions, and with the various assumptions which are made, the lower limit of estimation of the reaction rate is between 6 and 25 per cent h−1. As a mean value, during wintertime, in the Rouen region, 7.1 per cent of total airborne sulphur in the atmosphere is in the form of H2SO4." @default.
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• W2040396951 date "1973-04-01" @default.
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• W2040396951 title "Etude de la transformation de l'anhydride sulfureux en acide sulfurique en relation avec les donnees climatologiques, dans un ensemble urbain a caractere industriel, rouen" @default.
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• W2040396951 doi "https://doi.org/10.1016/0004-6981(73)90100-5" @default.
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