关键词: pH电极, 氮化钛, pH测定

Abstract: Titanium nitride was recommended as pH-sensitive materials to fabricate pHsensors.The TiNelectrode studied in this paper showed a linear response in the pHrange 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 1min.It exhibits some advantages over the glass pHelectrode in more rigid structure and better selectivity toward cations of alkali metals, effectively overcoming the interference of Na⁺in high pHsolution.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 2m Vas measured in pH 13.5 and 14 solution for 2h.When the electrode was alternately measured in the solution of pH13.5 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 over₃months.

Key words: pHElectrode, Titanium nitride, pH measurement