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采用离子选择性电极直接电位法测定组分的含量时,在线性检测范围内符合能斯特线性关系,可使用标准曲线法或标准加入法.而在线性检测范围以下,由于斜率不固定(实际非线性)且电位漂移严重,故用直接电位法测定较困难.虽然采用作图法或零电位法可以在有限的范围内使用, 但手续亦较繁,误差颇大.B.M.?和A.A. ?在测定钠离子浓度时曾采用了电极串联法.作者在讨论电极电位叠加性的基础上设计了一种用于叠加电位测定的电极杯,并应用于萤石中氟的测定以提高高含量测定的精度.本文将叠加电位法与二次标准加入法相结合以提高电位法的灵敏度并应用于镍基合金中痕量银的测定.
When using ion selective electrode direct potentiometry to determine the content of the components, the Nernst linear relationship is fitted within the linear detection range, and the standard curve method or the standard addition method can be used. Below the linear detection range, since the slope is not fixed Non-linear) and potential drift serious, so the direct potential method is more difficult to determine. Although the use of mapping or zero potential method can be used within a limited range, but also more complicated procedures, the error quite large .BM? And AA? The electrode series method was used to determine the concentration of sodium ion.The author designed an electrode cup for superposition potential measurement based on the discussion of electrode potential superposition and applied it to the determination of fluorine in fluorite to improve the determination of high content of Accuracy.In this paper, the superposition potential method combined with the secondary standard addition method to improve the sensitivity of the potential method and applied to the determination of trace silver in nickel-based alloys.