By J. L. Brownlee

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However, information on the solubilities of these chelates appears not to be available in the literature. 8. Iotixchange Behavior of Vanadium Several very good works on ion exchange techniques and procedures have been published in recent years. Auaterweil (1o8) and Eeckelaers (109) have written books in French on the general aspects of ion exchange. Two American texts are those of Samuelson (110) and the works edited by Nachod and 39 Schubert (111). These give procedures for many separations, as well as a discussion of the theory and techniques Involved in Ion exchange.

30 Mev sum peak a rather intense annlhalatlon radiation, has been used successfully as a vanadium tracer. However, its relatively short half-life (16 days) limits its general applicability. 0 cm from a 3“ x 3“ NaI(Tl) cylinder; for a standard well counter (1-1/2” diameter x 2“, well 3/4” x 1-1/2” deep), these efficiencies are approximately 22 percent and 20 percent (140), respectively. The 330-day isotope, V49, has a half-life which makes It suitable for use as a tracer; however, it decays completely by electron capture, with accompanying X-radiation.

Material of this sort is best treated Many vanadfum minerals which are not attacked appreciably by acids will yield to fusion with sodium or potassium carbonate (to which a small amount of nlter Is added),or sodium peroxide. Certain types are also susceptible to attack by sodium or potassium hydroxide fusion, conducted In nickel or Iron crucibles, followed by dissolution of the melt In acid. A ma~or dlsadvamtage”of most fusion techniques l~es In the rather long period of heating required for complete fusion.

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