Citation: GUO Qi, WU Xinqiang, HAN Enhou, KE Wei. In-situ pH Measurement System and Mechanism for High Temperature Aqueous Solutions[J]. Chinese Journal of Applied Chemistry, ;2016, 33(11): 1329-1336. doi: 10.11944/j.issn.1000-0518.2016.11.160082 shu

In-situ pH Measurement System and Mechanism for High Temperature Aqueous Solutions

1.
Key Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Corresponding author: WU Xinqiang,
Received Date: 3 March 2016
Available Online: 18 May 2016
Fund Project:

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.
- high temperature aqueous environment,
- pH measurement,
- membrane electrode,
- yttria-stabilized zirconia electrode,
- in-situ measurement,
- thermodynamical calculation
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沈阳化工大学材料科学与工程学院沈阳 110142