岩石中锆(铪)的离子交换分离及其在离子交换薄膜上的富集

CATION-EXCHANGE SEPARATION AND ION-EXCHANGE- MEMBRANE CONCENTRATION OF ZIRCONIUM AND HAFNIUM IN ROCK SAMPLES

岩石中锆、铅的含量及比值对元素的地球化学研究工作往往起着重要的指示剂作用，由于锆、铪的化学性质极为相近，目前国外分析锆、铅主要以中子活化、同位素稀释等大型仪器分析方法为主，国内普遍采用X荧光光谱分析。但是对于岩石中含量极微的锆和铪，无论用直接粉末法或熔融制样法进行X荧光光谱分析都存在一定困难。主要是灵敏度低和基体效应不易克服。

Ion-exchange separation and ion-exchange-membrane concentration of trace Zr and Hf in rocks are described in the present paper. Zr and Hf are quantitatively separated from other elements by means of ion-exchange. The solution of sample in 1.2 mol/L HCl medium passes through the column and is eluted with 2 mol/L HCl-20% CH3CH2OH to remove Fe, Al, Ca, Mg, U and Ti. Zr and Hf can be easily eluted with 0.1 mol/L oxalic acid and then adsorbed on the E-105 ion-exchange membrane for XRP analysis.