抄録
Progresses and problems of laboratory studies of heterogeneous processes on solid aerosol surfaces are presented in this paper. Heterogeneous reactions on solid aerosol surfaces have attracted great attention because of its ability to affect the concentrations of OH radicals and ozone in the troposphere. Laboratory studies have been extensively carried out to measure the uptake coefficient of trace gases on surrogate surfaces of mineral dust aerosols. The uptake coefficients or the reaction probabilities are necessary in estimating the mass transfer processes around aerosols. Results of model simulations support the importance of laboratory studies of heterogeneous processes. The observed uptake coefficient should be corrected for the physical structures and surface area of the samples. As an example, recent papers reporting the reactions of nitrogen dioxide on solid surfaces are reviewed. Based on the recent studies, thin water films on solid aerosol particles may be quite important in the chemistry of the boundary layer in urban areas. Although heterogeneous reaction mechanisms have been proposed in some specific conditions, an understanding is required on the reaction mechanisms and reaction probabilities of nitrogen dioxide with coexistence water in a systematic manner. Finally problems and future directions on laboratory studies of heterogeneous aerosol chemistry are summarized.
