Inversion of boron isotope effect during chemical exchange in extraction systemsстатья
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Дата последнего поиска статьи во внешних источниках: 4 июня 2021 г.
Аннотация:In the processes of boron isotopic exchange in liquid-liquid systems using boricacid as the main working substance, the lighter boron isotope is concentrating in the organicphase, which takes place both in the case of phase exchange (tributyl phosphate, TBP) and atthe chemical (trioctylamine, TOA) isotope exchange. That is, boron-10, as a rule,predominantly passes into the organic phase. In contrast to the previously observedeffects, our studies for several extraction systems using secondary amines (diethyl,dipropyl, and dibutylamine as the organic phase) demonstrated the inversion of theboron isotope effect when a more light isotope 10B is concentrated in the aqueous phase.At the same time, the level of the values of the single stage separation factor of boronisotopes turned out to be quite high and amounted to 1.020 - 1.028. The paper discusses thepossible causes of the discovered phenomenon, and also considers the potential forpractical application of such an effect.