Abstract
A 10 g sample dried at 110°C was ground by a vibrating mill for 4 min, mixed in a polyethylenebottle, and pressed into an aluminum ring (40 mm i. d., 5 mm high) under a pressure of 30 tons to makea sample briquet. Peak intensities of Kα lines of the minor elements in the briquet were measuredby the method of fixed time, 100 s. Background intensities were also measured to get net intensities. Furthermore, the Cl Kα intensity was measured as an internal standard to get the intensity ratiosof the Kα line of each element to Cl Kα. Standard samples were prepared by careful mixing ofgiven amounts of the minor elements with the guaranteed reagent of sodium chloride. Calibrationcurves of both the intensity and intensity ratio vs. the concentration were obtained with goodlinearities. Determination results of calcium, strontium, and sulfate ion in ordinary salt, sun-driedsalt, Chinese salt, and Australian salt by the present method agreed well with those by the conventionalmethods. A standard addition method also gave similar good results. On the other hand, both sides of the briquet sample of ordinary salt and Chinese salt, which were hygroscopic, showedoften large discrepancies in intensities of Mg Kα or K Kα, and further investigation is required for the determination of magnesium and potassium in these salts.
