Particle Size Distribution Measurements below Five Microns

Abstract

The present study has demonstrated the feasibility of using added foaming agents to fractionate organic compounds which show little inherent ability to foam (and have relatively low surface activities). The fact that the product is contaminated with an added agent should be relatively unimportant in analytical determinations. However, if charged agents are used in preparative work, removal should be rapid and complete using a short column of ion exchanger.Foam fractionation should receive more attention from analysts. The simplicity of the technique and the fact that separability is usually improved in dilute solutions make foam fractionation attractive for trace analysis. Studies designed to evaluate structural effects on enrichment probably should be carried out using simple solutes and agents, but there is little question that ultimately the technique will be more useful in dealing with the more complex systems to which it was originally applied*-i.e., those involving large polar heat-sensitive molecules of the type encountered in biological samples.

Johnson's SB Distribution Function as Applied in the Mathematical Representation of Particle Size Distributions. Part 2: Application of numerical results

“…The powder considered is calcium phosphate. Table 3 gives its particle size analysis results, where the number size distribution was measured by electron photomicrographs and electronic counting and sizing and the volume size distribution by centrifugal sedimentation [4]. As shown in Figure 2, the measured number and volume size distributions can be represented well by the SB distribution function.…”

“…Similarly, for any successive order distributions, we can obtain (4) Therefore, substituting Eq. (4) into Eq.…”