电力科技与环保2024，Vol.40Issue(4)：416-426,11.DOI:10.19944/j.eptep.1674-8069.2024.04.010
基于PVC基体的铵离子敏感膜制备及性能表征
Preparation and performance characterization of ammonium ion sensitive bembrane based on PVC substrate
摘要
Abstract
Ammonium ion selective electrode is an important component of ammonia nitrogen water detection sensor,and ammonium ion sensitive membrane is a key factor affecting electrode performance. Effects of plasticizers,ion additives,and ion carriers on response performance of ammonium ion selective electrodes were investigated,and the changes in performance parameters of the prepared electrode sensitive membrane were also explored,in which PVC was used as sensitive membrane substrate. The effects of 9 types of interfering ions such as Li+and Na+on electrode selectivity and anti-interference ability were also studied in this paper. The research results indicate that the optimal formula for the sensitive membrane is 50％DBP+0.75％ KTPClPB+1.20％ non bacterial agent. Mass ratio of the substrate PVC to DBP is 1∶1,and mass ratio to solvent (PVC∶THF) is about 1∶20. The lower detection limit of the sensitive film under this formula is 1.26×10-5 mol/L. When the concentration of ammonium chloride solution is greater than 10-3 mol/L,the response time is 0.5-2.0 s. While its concentration is less than 10-3 mol/L,the response time is extended to about 5s;The relative standard deviation of the reproducibility performance test is less than 2％,and the electrode life exceeds 90 days,indicating good performance. The characterization results such as XRD show that the membrane has an amorphous microstructure,and the good compatibility of each component is beneficial for enhancing the NH+4 response stability. After adding plasticizers and ionic additives,significant changes about main structure of the ion carrier are not appeared,which indicating integrity of the membrane. Selectivity coefficients of all 9 types of ions are less than 0,indicating that the interference is relatively small. Among them,K+interference is the largest,which can be solved by the proposed K+concentration correction equation,thereby improving the accuracy of ammonia nitrogen ion detection.关键词
脱硫废水/铵离子选择电极/敏感膜/增塑剂/电极性能Key words
desulfurization wastewater/ammonium ion selective electrode/sensitive membrane/plasticizers/electrode performance分类
能源科技引用本文复制引用
雒建中,林正根,柏源,韦飞,周香,刘田田,梅蓉,金奇杰,徐海涛,闫新龙..基于PVC基体的铵离子敏感膜制备及性能表征[J].电力科技与环保,2024,40(4):416-426,11.基金项目
国家自然科学基金项目(22378417) （22378417）
国家能源集团科学技术研究院有限公司科技项目(HB2023Y02) （HB2023Y02）
