用离子选择电极指示络合滴定终点来测定溶液中金属离子浓度的方法,具备了络合滴定和离子选择电极直接测定这两者的优点。这种方法既可以消除主观误差,更可以减少测定量,还易于进行自动分析。通常在溶液中存在的外来离子对电极多少会有干扰,因此在用离子选择电极直接测定以前,先要知道溶液中存在的离子及其浓度,然后再作工作曲线。而滴定法是测定溶液中离子的相对浓度变化,这样外来离子在络合滴定中的影响就不太大。此外,各种不同离子的选择电极至今制备得还不多,且大部分是一、二价的。若采用络合反滴定法,则三、四价的离子也可 The method of determining the concentration of metal ions in solution using an ion-selective electrode to indicate the endpoint of the complexometric titration provides the advantages of both complexometric titration and direct ion-selective electrode determination. This method can eliminate subjective errors, but also reduce the amount of measurement, but also easy to carry out automatic analysis. Normally, the presence of extraneous ions in the solution can interfere with the electrodes to some extent. Therefore, before using the ion-selective electrode to determine the ions directly, it is necessary to know the ions present in the solution and its concentration before proceeding to the working curve. The titration is the determination of the relative concentration of ions in solution changes, so that the impact of foreign ions in the complexation titration is not too big. In addition, a variety of different ion selective electrode has not been prepared so far, and most of the one and two. If complex counter-titration, the three, four-valent ions can be