부산대학교 도서관

In order to obtain a rapid indication of the presence of yttria earths in ores, a method was devised by which the yttrium content of ores is determined by x-ray fluorescence, using strontium as internal standard. Analysis of ores of known yttrium composition were made, and recovery and dilution experiments run, with average deviations ranging from plus or minus 2% at the 35% level to plus or minus 0.1% at the 5% level. Thallium, antimony, and tin may interfere to a slight extent if present in high concentrations; lead, rubidium, and iodine will interfere at low concentrations. All these will tend to give a high yttrium value. Niobium exents a significant effect even at low concentrations, resulting in a low yttrium value. If these are found to be present, it is necessary to resort to a spectrographic determination. (auth)