【摘要】 本文以N₂-BET法和CPB吸附法两种方法测定了我国东部自北至南11条主要大、中型河流沉积物的比表面.从两种方法的测定原理和沉积物的电镜图谱了解N₂-BET法比表面与CPB法比表面的差异.在此基础上,研究了我国东部河流沉积物比表面的地域分布趋势.结果表明,我国东部大、中型河流沉积物比表面呈南北高、中间低的“V”型分布,与沉积物中粘土矿物含量的分异规律相一致.更多还原

【Abstract】 The specific surface areas of 11 geographical and hydrological diverse sediments samples from the main rivers in the eastern China were measured using both the N2-BET method and the cetyl pyridinium bromide (CPB) method. The difference of the specific surface areas measured by these two methods were discussed from the methods’ mechanics, as well as the sample pretreat-ment techniques. Moreover, the geographical difference of sediments specific surface areas in the eastern China was studied. The results showed that, from north to south, the surface area firstly decreased, and then increased gradually, with the lowest point in the Yellow river, which coincided with the geographical tendency of the clay contents in sediments from those rivers in the eastern China.更多还原