摘要
以铂电极为指示电极,Ce4+标准溶液为滴定剂,对氧化还原滴定计算分析法同时测定Fe(Ⅲ)与Fe(Ⅱ)进行了研究。导出了同时测定Fe(Ⅲ)与Fe(Ⅱ)的滴定计算式。结果表明,电极的系统误差是影响测定结果准确度的主要因素,而且系统误差对Fe(Ⅲ)的影响比较大,对Fe(Ⅱ)的影响比较小。用刚开始滴定的实验数据,Fe(Ⅲ)的误差比较小;用接近化学计量点的实验数据,Fe(Ⅱ)的误差比较小。
By use of oxidation-reduction calculation titrimetry, Fe(Ⅲ) and Fe(Ⅱ) are determined simultaneously with potentiometric titration using platinum electrode as the indicator electrode and Ce^(4+) as the titrant. The calculation equation for the simultaneous determination of Fe(Ⅲ) and Fe(Ⅱ) was derived. The results show that the main factor which affects the accuracy is the systematic error of the electrode. The systematic error has more obvious effect on the determination of Fe(Ⅲ) than on the determination of Fe(Ⅱ). The measured error is small when the initial data of titration are used for the determination of Fe(Ⅲ)^( )and when the data near stoichiometric point are used for the determination of Fe(Ⅱ).
出处
《分析科学学报》
CAS
CSCD
北大核心
2004年第6期631-633,共3页
Journal of Analytical Science
基金
同济大学理科发展基金
关键词
滴定计算分析法
氧化还原滴定
电位滴定
Calculation titrimetry
Oxidation-reduction titration
Potentiometric titration
