在苏联許多中等学校里,經常進行着相当多的当地無机原料資源的研究工作。研究任何無机原料先須進行化学分析(先定性而后定量)。在化学分析之前須先把分析物料变为可溶狀态。用濃鹽酸,硝酸或其混合物(王水)來处理是分解礦石和礦物最通行的方法。这种方法从人們学会制造酸类时起即已实施。但这种方法有許多缺点,其中主要的缺点如下:1) Many secondary schools in the Soviet Union often carry out considerable research work on the resources of inorganic raw materials. Chemical analysis of any inorganic raw material is required (qualitative and quantitative). Analytical materials must first be dissolved before chemical analysis. Treatment with concentrated hydrochloric acid, nitric acid or mixtures thereof (aqua regia) is the most common method of disintegrating ores and minerals. This method has been implemented since people learned to make acids. However, this method has many disadvantages, of which the main disadvantages are as follows: 1)