Abstract
Based on the Claisse’s model, the authors introduced a theoretical formula, in consideration of the effects of particle size and mixing rate of particles, for the intensity of fluorescent X-ray for the inhomogeneous system, and the grade of homogeneity was determined. The formula shows that the internal standard (Co) is more effectively used in analysis of Fe when the specimen and other substances to be added are pulverized to the size of under 2∼3 μ and their particles are sufficiently mixed well; insufficient mixing results in an apparent increase of paticle size.
It was confirmed by the microscopic observation that the iron ore sample could be pulverized to the size of under 5 μ by wet crushing for 3∼5 min with the internal standard and the binder for briquetting, and that the mixing was also achieved sufficiently well by this crushing method. The influence of the matrix was almost completely cancelled by the present method and Fe was determined with good accuracy for the samples with a wide composition range of Fe, such as iron ores, manganese ores and slags. The calibration curve was not necessarily linear over a wide composition range of Fe, probably due to the little differences between the absorption coefficients of Fe and Co.
