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氟离子选择电极,除直接电位法测氟外,用间接法也能测定铝、稀土、硅、钙、镁、铁等。为了适应生产需要,我们用氟离子电极对稀土合金中稀土总量的测定进行了试验。根据试验结果,初步拟定了分析方法。一、方法要点样品用氢氧化钠熔融,干扰元素Fe~(3+),Al~(3+),Zr~(4+),Ti~(4+)用磺基水杨酸、乙酰丙酮各2毫升消除,在PH≌3.8,60％的乙醇介质中,用氟电极作指示电极,饱和氯化钾甘汞电极参作比电极,用标准氟化钠进行电位滴定。
Fluoride ion selective electrode, in addition to the direct potential method of measuring fluorine, the indirect method can also be measured aluminum, rare earth, silicon, calcium, magnesium, iron and so on. In order to meet the production needs, we use fluoride ion electrode rare earth alloy in the determination of total amount of rare earth were tested. According to the test results, the initial analysis of the proposed method. First, the method points Sample melting with sodium hydroxide, interfering elements Fe ~ (3 +), Al ~ (3 +), Zr ~ (4 +), Ti ~ (4+) sulfosalicylic acid, acetylacetone each 2 ml elimination, in PH ≌ 3.8, 60% ethanol medium, with a fluorine electrode as the indicator electrode, a saturated potassium chloride calomel electrode as a reference electrode, with standard sodium fluoride potentiometric titration.