盐湖卤水硼同位素测定中硼的二次离子交换分离

Separation of Boron by Using Ion Exchange Technique for the Isotopic Measurement of Boron in Salt Lake Brine

根据盐湖卤水水化学特点，介绍了一种用阳、阴离子交换树脂，动态和静态交换相结合，对盐湖卤水中的硼进行分离纯化的简易方法。用该方法从盐湖卤水中分离出来的硼足以满足同位素质谱分析的需要，分离过程不产生同位素分馏，获得了理想的实验结果。

A simple technique combining dynamic column with static bath ion exchange procedure was used to extract boron from salt lakes brine. All the cations in brine were first adsorbed by cation-exchange resin(H+ form) loaded into a column. Except boron, the anions in brine were adsorbed by the addition of anion-exchange resin (OH-form) to the elution containing anions and boron when the pH value of elution was controlled to be 4. The recovery of boron was > 98%. The solution was evaporated at 60℃ until the boron concentration of elution was about 1 g/L. The isotopic ratio of boron was determined by thermal ionization mass spectrometry based on the measurement of C_(s2)BO_(2+) ion with graphite loading. The results showed that there ins no isotopic fractionation to be found after ion-exchange process.