聚酰胺修饰碳糊pH电极测定高酸溶液中的氢

Determination of Hydrogen with High Concentration by Carbon Paste Electrode Modified with Polyamide

将石蜡、石墨粉和聚酰胺按 5∶ 1∶ 2质量比混匀 ,制成全固型聚酰胺修饰碳糊氢电极。它在 1 %～ 1 0 %KNO3 溶液中 ,对 H+ 的线性响应范围为 1 .1 0× 1 0 - 5～7.0 2 mol/L (相关系数为 0 .9993 ) ,响应时间为 3 0～ 90 s,响应斜率为 3 0 .3 m V/p H,检出限为 5 .0 1× 1 0 - 6mol/L。对常见共存离子的选择性系数为 1 0 - 5～ 1 0 - 4。电极性能稳定 ,重现性好 ,使用寿命可长达 6 0多天 ,特别适合于高酸度溶液中 H+ 的测定。

Mixing paraffin, graphite and polyamide by the mass ratio of 5∶1∶2, a polyamide-modified carbon paste electrode is prepared. The linear range about voltammetric response is 1.10×10 -5～7.02 mol/L for hydrogen ion in the solution of 10% KNO 3. The correlation coefficient is 0 9993. The response time of the electrode on H + is from 30 to 90 second. The selective coefficients of most common ions coexisted with H + are from 10 -5 to 10 -4. The life of the electrode is long as 60 days.