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| 高温水溶液pH值原位测量系统与机理 | |
| 引用本文： | 郭琦,吴欣强,韩恩厚,柯伟. 高温水溶液pH值原位测量系统与机理[J]. 应用化学, 2016, 33(11): 1329-1336. DOI: 10.11944/j.issn.1000-0518.2016.11.160082 |
| 作者姓名： | 郭琦 吴欣强 韩恩厚 柯伟 |
| 作者单位： | 中国科学院金属研究所,中国科学院核用材料与安全评价重点实验室,辽宁省核电材料安全与评价技术重点实验室 沈阳110016 |
| 基金项目： | 国家自然科学基金(面上项目)(51371174)和中国科学院金属研究所创新基金(SCJJ-2013-ZD-02)资助项目 |
| 摘 要： | 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H3BO3LiOH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。 |
| 关 键 词： | 高温高压水 pH值 陶瓷薄膜电极 YSZ电极 原位测量 热力学计算 |
| 收稿时间： | 2016-03-03 |
In-situ pH Measurement System and Mechanism for High Temperature Aqueous Solutions |
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| 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 | |
| Authors: | GUO Qi WU Xinqiang HAN Enhou KE Wei |
| Affiliation: | 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 |
| Abstract: | 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 H3BO3LiOH 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. |
| Keywords: | high temperature aqueous environment pH measurement membrane electrode yttria-stabilized zirconia electrode in-situ measurement thermodynamical calculation |
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