沉淀滴定计算分析法同时测定溴酸根与碘酸根

以银电极为指示电极，Ag^ 标准溶液为滴定剂，对BrO3^-,IO3^-的混合离子进行了测定。结果表明：BrO3^-或IO3^-单种离子，测定误差小于1％；BrO3^-与IO3^-混合离子，IO3^-的测定误差约为1％，但BrO3^-的测定误差较大，此外，对BrO3^-,IO3^-与Ag^ 沉淀反应的动力学为进行了研究，并对产生误差的原因进行了讨论。

Simultaneous Determination of Bromate and Iodate by Precipitation Titrimetry

The single component of BrO - 3 or IO - 3 and the mixture of BrO - 3 and IO - 3 were determined respectively through potentiometric titration using silver electrode as the indicator electrode and AgNO 3 as the titrant. The relative error was below 1% for the determination of single component of BrO - 3 or IO - 3.In the mixture of BrO - 3 and IO - 3,a high accuracy could be obtained for the determination of IO - 3,but a systematic error was observed for the determination of BrO - 3. The kinetic processes of the precipitation reactions were also studied by connecting the electrode system to a computer with analog/digital card. It was found the equilibrium of precipitation reaction could be reached within 2 min between IO - 3 and Ag +, and within 6 min between BrO - 3 and Ag +.