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用碱熔法将铌、钽、铁等元素分离,再用氟离子选择性电极在 pH6.2的柠檬酸三钠-硝酸钾介质中测定氟。
The alkali fusion method is adopted to separate niobium, tantalum, iron and other elements, and the fluorine is measured by a fluoride ion selective electrode in a trisodium citrate-potassium nitrate solution having a pH of 6.2.