摘要
用激光粒度仪和沉降法分别测量了黄土和古土壤的粒度分布,通过对比两种方法测量结果,认为激光法测量的重复性和测量精度较高,小于5μm颗粒含量低于沉降法,平均粒径较沉降法偏粗;造成这种差异的原因主要是不同方法的原理不同和样品中颗粒形状不规则所致.黄土风化成壤过程中形成的次生碳酸盐矿物可能主要存在于小于5μm的颗粒内.
It is important to examine the performance of the laser method and hydrometer methods and to understand its discrepancy. In the present study, the grain size of loess and soil samples are measured by laser particle size analyzer and hydrometer methods, respectively. To compare analytical results using different methods, it is shown that the reproducibility and measurement precision of the laser particle size analyzer are better than those of hydrometer methods. It suggests that the content of clay particles (<5 μm) is somewhat lower and mean size is coarser in laser particle size analyzer than in hydrometer methods. Differences in the measure results between the laser method and hydrometer methods may be attributed to the various principles of the methods and the particle shape. It indicates that grain size of secondary carbonate in loess and soil, which was mainly formed during soilforming process, may be less than 5 μm.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第4期87-92,共6页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金资助项目(40071006)
