沉淀单点滴定法与双点滴定法研究

Precipitation single-point and double-point titrimetry

导出了沉淀单点滴定法与双点滴定法计算式。以银电极为指示电极 ,Ag+ 标准溶液为滴定剂 ,对Cl-、Br-、I-及SCN-等离子的测定进行了研究 ;对影响测定结果准确度的因素进行了讨论。实验发现 ,在α =1 .0～ 1 .1的条件下 ,单点滴定法有较高的准确度 ;在α1 ≈ 1 .0～ 1 .1、ΔV =0 .5～ 1 .0mL的条件下 。

The determination of Cl^-,Br^-,I^- and SCN^- was studied through both single-point and double-point titrimetry using Ag^+ as titrant. The results showed that the measured error was small when α was 1.0～1 1 for the single-point titrimetry and when α_1 was about 1.0～1 1 and ΔV was 0.5～1.0 mL for the double-point titrimetry.