研制了以氧化钇稳定氧化锆（ YSZ）陶瓷薄膜电极为pH电极、外置压力平衡式Ag／AgCl电极为参比电极的高温高压水溶液pH值原位测量系统，测量了H3 BO3＼LiOH水溶液在473.15～573.15 K范围内的pH值，并与热力学计算得到的pH值比较。结果表明，当温度高于548.15 K时，测量系统可以实现pH值的准确测量；而低于此温度时，由于YSZ陶瓷膜内阻过大，测得的pH值与理论计算值存在偏差，且随温度的降低，测量偏差增大。讨论了该系统的pH值测量机理。
A system based on yttria-stabilized zirconia ( YSZ ) membrane electrode and external pressure balanced Ag/AgCl electrode has been developed for in-situ pH measurement in high temperature aqueous solutions.The pH values of H3BO3\LiOH solutions at 473.15 K to 573.15 K were measured by this system and compared with thermodynamically calculated pH values .The precise pH measurement is achieved when temperature is higher than 548.15 K.While below 548.15 K, deviation exists due to the large resistance of YSZ ceramic membrane and it increases with decreasing temperature .The mechanism of pH measurement in high temperature aqueous solutions is also discussed .
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