分析化学2025，Vol.53Issue(5)：774-784,11.DOI:10.19756/j.issn.0253-3820.241496
基于疏水固态接触层的高稳定性铵离子选择电极的制备及性能测试
Preparation and Performance Test of Highly Stable Ammonium Ion Selective Electrode Based on Hydrophobic Solid Contact Layer
摘要
Abstract
The stability of ammonium ion selective electrode is an important indicator to ensure accurate monitoring of ammonia nitrogen concentration in drinking water.However,in long-term monitoring process,interfering ions and water molecules in water samples may penetrate into the interior of the ammonium ion selective electrode to form a water layer,which affects the potential response and stability of the electrode.Perfluorooctanoic acid is a low surface energy material,and doping it in polyaniline can reduce surface energy of the composite and improve surface roughness.In this work,five ammonium ion selective electrodes were prepared by doping polyaniline with different concentrations of perfluorooctanoic acid as a solid contact layer,which made the solid contact layer of electrode had hydrophobic properties,thereby improving stability of the ammonium ion selective electrode.The stability of the ion-selective electrode was evaluated by potential drift experiment,and the optimal doping concentration of perfluorooctanoic acid in the sediment solution was determined to be 5 mmol/L.The experiment results showed that the solid contact layer had a water contact angle of 132º under the doping concentration,the potential drift rate was 41.66 μV/h,and potential drift rate in the aqueous layer test was 1.31 mV/h,which were all better than those of the unmodified electrode.The standard deviation of the electrode potential was 1.42 mV,which was obviously superior to that of the unmodified electrode.The characteristics of high stability of the electrode made it suitable for long-term monitoring of ammonia nitrogen content in water samples.关键词
铵离子选择电极/疏水固态接触层/全氟辛酸/水层Key words
Ammonium ion selective electrode/Hydrophobic solid contact layer/Perfluorooctanoic acid/Water layer引用本文复制引用
刘晨宇,尹加文,韩蕴哲,鹿胜康,金庆辉..基于疏水固态接触层的高稳定性铵离子选择电极的制备及性能测试[J].分析化学,2025,53(5):774-784,11.基金项目
国家自然科学基金项目(No.62271272)资助. Supported by the National Natural Science Foundation of China(No.62271272). （No.62271272）
