基于氮化钛的全固态碱性pH电极的研制

p H值是溶液化学中重要的检测指标 .在工业、农业、生物、医学及环境保护等各个领域都有着广泛应用 .目前 ,多采用玻璃 p H电极进行 p H值的测量 .然而 ,玻璃 p H电极也存在一定的不足 ,玻璃敏感膜阻抗高达 1 0 10 Ω,容易造成电磁干扰 ;玻璃 p H电极极易破碎 ,难以适用于强搅拌的工业过程体系 ;氢氟酸能强烈地浸蚀玻璃膜 .因此 ,玻璃 p H电极不能长时间地用于含氟腐蚀体系 p H的测量 ;另外 ,玻璃 p H电极在强碱性溶液测量时会产生“钠差”.因此 ,多年来对非玻璃型 p H电极的研究一直是化学传感器研究领域中的活跃课题之一 .目前常见的…

A Novel pH Electrode Based on Titanium Nitride

Titanium nitride was recommended as pH-sensitive materials to fabricate pH sensors. The TiN electrode studied in this paper showed a linear response in the pH range of 11-14 with a response slope of -60 mV/pH. The correlation coefficient was 0.998. The response time of the electrode was about 1 min. It exhibits some advantages over the glass pH electrode in more rigid structure and better selectivity toward cations of alkali metals, effectively overcoming the interference of Na + in high pH solution. No interferences from commonly accompanying cations and anions were observed. The electrode also showed a high stability and a good reproducibility. The potential drift was less than 2 mV as measured in pH 13.5 and 14 solution for 2 h. When the electrode was alternately measured in the solution of pH 13.5 and 14 solution, the relative standard deviation estimated for six measurements were about 0.27% and 0.29%, respectively. In addition, the electrode was performed excellently in corrosion medium containing F -. The lifetime of the electrode was over 3 months.