近十年来,我室一直采用氟硅酸钾法测定岩石矿物中的二氧化硅。在工作中我们发现,沉淀体系中大量钾盐的存在是保证分析质量的一个十分重要的环节。这一点资料中均有介绍。采用氢氧化钾熔矿,在试样熔块提取酸化后,须加入固体氯化钾至饱和。由手册可知,氯化钾在水中的溶解度随温度而异,氯化钾的加入量难以控制,少了会使 For nearly a decade, our laboratory has been using potassium fluosilicate method to determine the silica in rock minerals. In our work, we found that the existence of a large amount of potassium salt in the precipitation system is a very important link to ensure the quality of analysis. This information is introduced. Potassium hydroxide mining, after the sample frit extraction acidification, to be added to the saturation of solid potassium chloride. From the manual we can see that the solubility of potassium chloride in water varies with temperature, the amount of potassium chloride is difficult to control, less will make