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用离子选择电极测定氟,铝是主要的干扰元素。为了消除铝的干扰,不少资料作了详细介绍,一般运用柠檬酸-三乙醇胺掩蔽体系比较理想。该体系可消除37mgAl,1mgBeO,0.5mgZrO的干扰。 一般样品中的铝不超过20％,取50mg样品进行分析,铝量约在10mg左右,这远比允许的铝量(37mg)低。 目前岩矿和化探样品中氟的测定是在银坩埚中用Na2O_2或NaOH熔融的方法,要消耗大量贵重的金属银。经试验证明:改用高铝
Determination of fluoride with an ion-selective electrode, aluminum is the main interference element. In order to eliminate the interference of aluminum, a lot of information was introduced in detail, the general use of citric acid - triethanolamine shelter system is ideal. The system can eliminate 37mgAl, 1mgBeO, 0.5mgZrO interference. Normal samples of aluminum do not exceed 20%, take 50mg samples for analysis, the amount of aluminum is about 10mg, which is far less than the allowable amount of aluminum (37mg). At present, the determination of fluorine in rock and geochemical samples is a method of melting Na 2 O 2 or NaOH in a silver crucible to consume a large amount of expensive metallic silver. Proved by the experiment: switch to high-aluminum