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VOl. 59termining species, i t is suggested that a physicochemical technique such as measurement of optical absorbance in the ultraviolet range32 might be employed to determine the concentration of NzOs and perhaps NOa-present in "Os.The effects of the various additives used in this investigation were emphasized by introducing them at relatively high concentrations of about 0.1 mole (32) R. N. Jones and G . D. Thorn, Con. J . Res., 27B, 580 (1949).fraction. If further studies.in this field are undertaken, it is suggested that more dilute solutions be investigated. Such a procedure permits the use of additives such as KC104 which, by virtue of their low solubility in HN03, could not be investigated in the present work. Moreover, in dilute solutions the neutral salt effect of nitrates may be diminished t o the extent that the expected acceleration of the rate of decomposition by NOs-could be observed.A ' I radient elution" method has been adapted for operating an ion-exchange resin column using an eluting agent in which the p f I is changed continuously. The method shortens the column operating time required for separation of the rare earth elements without adversely affecting their purity.

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