以N-(苯并〔1-3〕二噁茂-5-亚甲基)-1H-苯并咪唑-2-甲酰肼为载体的PVC膜铬离子选择电极的研究

PVC CR(III) ION SELECTIVE ELECTRODE BASED ON N-(BENZO[D][1,3]DIOXOL-5-YLMETHYLENE)-1H-BENZO[D]IMIDAZOLE-2-CARBOHYDRAZIDE

制备了以N-（苯并〔1-3〕二噁茂-5-亚甲基）-1H-苯并咪唑-2-甲酰肼为载体的PVC膜电极.结果表明：该电极对铬（Ⅲ）离子在10-1~10-6mol/L的浓度范围内有良好的响应性能,响应斜率为22.9 m V/decade,检测下限为4.6×10-7mol/L.电极具有较好的抗干扰性、重现性和稳定性,能在p H值为1.13~6.15的范围内和体积分数小于20%的乙醇溶液中使用.可用于水样品中铬含量的直接测定和电位滴定Cr3＋的指示电极.

A PVC Cr （IlI ） ion selective electrode based on N- （ benzo I d ] E 1,31 dioxol-5-ylmethylene ）- 1H-bezon [d] imidazole-2-carbohydrazide （L） has been prepared. The results show that the electrode is high sensitive and selective to Cr3＋. The response slope is 22.9 mV/decade in the range of 101-10-6 mol/L with the detection limit of 4.6 × 10-7 mol/L. The electrode is reproducible and stable, and could work in a certain concentration aqueous ethanol solution （volume percentage 〈 20% ） and certain range of pH （1.13 - 6.15 ）. The proposed electrode has been used for the determination of Cr3＋ ions in water samples and as an indicator electrode in potentiometric titration of Cr3＋ ions with EDTA.