络合体系中的相对滴定法及其应用于铝的测定

本文提出了络合体系中的相对滴定分析法，它以滴定到一定的状态时，滴定剂体积与被测物的基之间的线性关系为定量基础，用仪器分析的定量方法进行定量，适应于所有类型的络合体系，即使对滴定突跃很小或根本无突跃的体系也同样适用。用氟离子滴定铝离子的实验结果表明本方法的精密度很高。一般相对误差小于0．1％。即使对于铝离子的量小到10-7mol／L时，在最佳实验条件下的相对误差也不大于0．2％。该方法既具有滴定分析法的高精密度，又具有仪器分析法可以测量微量物质的优点，并且设备和方法简单。

The Relative Titration in Complexing Systems and Its Application to the Determination of Aluminium

The relative titration in complexing systems is based on the linear relation between the amount of analyte and the volume of titrant consumed to reach a certain titration state. The determination of Al3+ by F- demonstrates the high accuracy of the method. Generally the relative error of measurements is less than 0. 1% and does not exceed 0. 2% even when the concentration of Al3+ is as small as 10-7 mol/L. This method has both the advantage of high accuracy in titration and the capacity of determining trace amount of analyte in instrumental analysis. The experimental apparatus and procedure are simple.