酸性介质中硫电极固定电位滴定法测定金属离子

周激; 胡标; 王琳琳

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酸性介质中硫电极固定电位滴定法测定金属离子

化工与环境工程 | 更新时间：2026-09-14

- 酸性介质中硫电极固定电位滴定法测定金属离子
- Measurement of Metal Ion by Using Sulfur Electrode Fixed Potentiometer Titration in Acid Medium
- 中北大学学报（自然科学版） 2011年32卷第4期页码：477-481
- 作者机构：
  
  太原工业学院化学与化工系
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- 纸质出版：2011
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周激, 胡标, 王琳琳. 酸性介质中硫电极固定电位滴定法测定金属离子[J]. 中北大学学报（自然科学版）, 2011,32(4):477-481.

周激, 胡标, 王琳琳. Measurement of Metal Ion by Using Sulfur Electrode Fixed Potentiometer Titration in Acid Medium[J]. 2011, 32(4): 477-481.
周激, 胡标, 王琳琳. 酸性介质中硫电极固定电位滴定法测定金属离子[J]. 中北大学学报（自然科学版）, 2011,32(4):477-481. DOI：

周激, 胡标, 王琳琳. Measurement of Metal Ion by Using Sulfur Electrode Fixed Potentiometer Titration in Acid Medium[J]. 2011, 32(4): 477-481. DOI：

摘要

根据S2-与金属离子的沉淀反应以及H2S在水溶液中的的电离平衡

推导出了在pH5时

以玻璃pH电极为参比

用硫电极测得硫离子滴定金属离子至化学计量点处的电动势值与pH值呈线性关系

而与其他因素无关;当控制溶液的pH值不变时

化学计量点处的电动势为一固定值.以此固定电位法对Pb2+

Cu2+试液进行了测定

最大相对平均偏差为1.1%

5次测定平均结果的相对百分误差最大为5.3%.

Abstract

From the precipitation reaction based on S2-with metal ion and ionization equilibrium of H2S in aqueous solution

it could be deduced that the potential value at stoichiometric point was proportional to the pH value of solution and was independent of other factors when metal ion was titrated by S2-ion

by using pH glass electrode as reference electrode and sulfur electrode as measuring electrode at pH5.In addition

it could be found that the potential at stoichiometric point was invariable once pH value of solution is fixed.Sample solutions including Pb2+ and Cu2+ were measured through this fixed potential method.The results indicated that the maximum relative deviation was 1.1% and the maximum relative error of five measurement values was 5.3%.

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references

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