Currently, the measurement of the visibility mainly depends on the human eyes, so that the objectivity is relatively poor. In general, the higher the visibility is, the greater the measurement error is. On the other h...
详细信息
Source apportionment studies of TSP （atmospheric particulate matter with aerodynamic diameters ≤ 100 μm） and PM10 （atmospheric particulate matter with aerodynamic diameters ≤ 10 μm） have revealed that soil dus...
详细信息
Source apportionment studies of TSP （atmospheric particulate matter with aerodynamic diameters ≤ 100 μm） and PM10 （atmospheric particulate matter with aerodynamic diameters ≤ 10 μm） have revealed that soil dust is an important source of these particulates in China. In this study, the contamination of soil dust was assessed through the use of a geoaccumulation index （Igeo）. The mass concentration profiles of 17 elements （Na, Mg, Al, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br, Ba, and Pb） were established for urban soil dusts. Geochemical compositions of soils from 15 cities were used to represent background urban soil compositions. The results of this study indicated that a number of cities are severely polluted by particulates containing Ca, Cr, Ni, and Cu in both size fractions （TSP and PM10）. Contamination with Zn, Pb, Co, and Br was moderate to severe （Igeo 〉 2）. The Al and Fe concentrations were not high enough for them to be considered contaminants.
TiO_(2) supported on active carbon fiber(TiO_(2)/ACF),an absorbable photocatalyst,is a new kind of material applied in air *** this paper,the influence of environmental temperature(T)and relative humidity(RH)on the ga...
详细信息
TiO_(2) supported on active carbon fiber(TiO_(2)/ACF),an absorbable photocatalyst,is a new kind of material applied in air *** this paper,the influence of environmental temperature(T)and relative humidity(RH)on the gas-solid adsorption of toluene and the photocatalytic oxidation(PCO)efficiency of adsorbed toluene on TiO_(2)/ACF were studied,and then,the purification capability of TiO_(2)/ACF was *** results showed that although the PCO efficiency increased under high RH and T levels,the amount of adsorption of toluene ***,quantitative analysis results of intermediates indicated that more environmental risk emerged when PCO of toluene was carried out at higher environmental T and RH levels because more toxic intermediates would be accumulated on the TiO_(2)/***,it is significant to control the environmental T and RH conditions in the application of the PCO technique.T 525uC and RH530% is the optimal condition for purifying toluene in our experimental system.
暂无评论