摘要
一些与金属离子有着沉淀或络合性质的弱酸,可在复合了化学计量的强碱之后,用pH玻璃电极作指示电极进行电位连续滴定。以8-羟基喹啉复合氢氧化钠的复合滴定剂为例,进行了一些单离子和双离子体系的验证实验,电位滴定曲线突跃明显,测定结果良好。
Some weak acids which could react with metal ions to produce precipitate or complexes, combined with stoichiometric amount of strong bases to titrate continuously. Many metal ions lacking of suitable indicator electrodes could be titrated by using both that and pH glass indicator electrode in potentiometric method. In this paper, the detective tests of single and two metal ions systems had been done with complex titrant which was a mixture of 8-quinolinol and sodium hydroxide. The potentiometric titration curves showed the sharp discontinuity at the equivalent point. Analytical results were satisfactory.
关键词
复合滴定剂
电位滴定
玻璃
电极
potentiometric titration
glass electrode
8-quinolinol(C_9H_7NO)
complex titrant
