Anwendungsmöglichkeiten des Radioaktiven Kryptonats von Silber in der Chemischen Analyse

Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

“…The technique has been used for the determination of vanadium in meteorites (255), rocks, ores, and concentrates (432,682,683), oil (69), oil field clays (394,395), and airborne particulate matter (39, 85). A radiochemical method used for the determination of vanadium involves the reduction of vanadium(V) with silver kryptonate with a resulting decrease in radioactivity which is proportional to the amount of vanadium present (639). Electron spin resonance has been suggested as a possible method for the determination of vanadium (431) with masking by EDTA eliminating the interference of all of the iron group elements except copper (234) Electron paramagnetic resonance can also be used for vanadium if the vanadium is first extracted in acetylacetone (235).…”

“…Nondestructive methods were used for the determination of chromium by neutron activation in aluminum (657), selenium (35), cement and steel (26), gallium and gallium arsenide (461,679), silicon, nickel, and tungsten (44), catalysts (553), diamonds (476), and plant tissue (244) By following the gamma-ray-induced reduction of chromium (VI) to chromium (III) potentiometrically, it was found that the time of occurrence of the end point was linearly related to the concentration of chromium (619). The presence of silver kryptonate will also cause the reduction of chromium(VI) to chromium(III) with a resulting loss in radioactivity of the solution which by means of a calibration curve can be related to the concentration (639). The determination of trivalent and hexavalent chromium-51 when both are present in the same sample can be achieved with aid of a separation on an alumina column (281).…”

“…In addition to the aforementioned reagents there are, listed in Table I, twenty more organic compounds which have been found to react with molybdenum and have been investigated as possible chromogenic reagents for the determination of molybdenum. Zirconium and hafnium Study of separation (574) Vanadium Study of method (639)…”