水泥及其原料中的氟通常采用水蒸气蒸馏-硝酸钍滴定法、锆-茜素红比色法测定,这些方法手续烦杂费时。近年来,操作简便,测定快速的氟离子选择电极在硅酸盐分析方面的应用日趋普遍。为了将这一分析技术应用于水泥分析,我们试验了水泥及原料中氟的测定条件,比较了三种络合缓冲液对铝的掩蔽效果,拟定了定方法。实验与讨论 (一)主要仪器和主要试剂 1.氟离子选择电极:自制,氟化镧 The fluorine in cement and its raw materials is usually measured by steam distillation-thorium nitrate titration and zirconium-alizarin red colorimetric method. The procedures of these methods are complicated and time-consuming. In recent years, the simple and rapid determination of fluoride ion selective electrode in the field of silicate analysis is becoming more common. In order to apply this analytical technique to cement analysis, we tested the determination conditions of fluorine in cement and raw materials, and compared the masking effect of aluminum with three complexing buffers. Experimental and discussion (A) of the main instruments and reagents 1. Fluoride ion selective electrode: homemade, lanthanum fluoride