硫同位素地质研究工作中,经常遇到的研究对象是硫酸盐矿物。如何把这些硫酸盐矿物转化为适于质谱测定硫同位素组成的SO_2气体,是我国硫同位素地质研究中急待建立的实验手段之一。 经典的方法中,可溶于水的硫酸盐,通常是先把它沉淀为BaSO_4,然后通过一系列的化学反应转化为SO_2。 七十年代初期,B.D.Holt等人提出直接加热分解BaSO_4制备SO_2的方法。之后, Sulfur isotope geological research work, often encountered in the study of sulfate minerals. How to transform these sulphate minerals into SO 2 gas which is suitable for the determination of sulfur isotopes by mass spectrometry is one of the experimental methods urgently established in the study of sulfur isotopes in China. In the classical method, water-soluble sulfates are usually precipitated as BaSO 4 first and then converted to SO 2 through a series of chemical reactions. In the early seventies, B.D. Holt et al. Proposed a method of directly heating and decomposing BaSO 4 to prepare SO 2. after that,