抄録
By applying a spectrophotometric method with xylenol orange to the determination of bismuth in barium-ferrite, a rapid determining method has been established.
The xylenol orange complex of bismuth is formed quantitatively in a perchloric acid medium of 0.1∼0.2 N. The absorption maximum of this complex is at 520∼532 milli microns. However, the relation between the bismuth content (0.00∼0.30 mg/50 mL) and the absorbance follows Beer’s law only at the wavelength of 540 milli microns. In this method, there is no significant effect even in case 20 mg each of alminium and iron, 0.1 mg each of antimony, tantalum and tin, 2 mg each of arsenic, molybdenum, titanium and zinc, 10 mg each of barium, cadmium, calcium, cobalt, lead, magnesium, manganese, nickel and strontium, 0.5 mg of chromium, 5 mg each of copper and vanadium, and 1 mg of tungsten are contained in the separated sample solution. Niobium and zirconium interfere.
However, niobium does not interfere, if it is separated as niobium pentaoxide, and the effect of zirconium can be eliminated by the use of sodium fluoride.
The time required for the analysis by this method is about 30 minutes.
The bismuth contents in the actual samples were measured by this method with satisfactory results.
