讨论了对纳米碳酸钙的粒径测量方法，如：电镜、激光粒度分布仪、沉降体积、筛分法。
The measurement methods of particle size of nano-CaCO_3 including SEM method, laser size distribution method, sedimentation volume method and screening method are discussed.
样品经粒度筛分试验、均匀度及稳定性检验，证明其中被检验元素分布均匀。
Through sizing experiments, homogeneity and stability tests of the samples, the results show that the elements to be determined are homogeneously distributed in samples.
采用干筛分析法测定西安市祭台村建筑开挖工地表土微团粒粒度分布，获取模拟粉尘释放通量的表土微团粒粒度分布参数；
The article mainly uses the dry filter analysis to measure the micro-aggregates size distribution, and the micro-aggregates size distribution parameter for simulating the dust emission flux;
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