KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Determining pK a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid-Base Transport Limitation Method | |
Yin, Fengjun1,2 ; Liu, Shuangshuang1; Hu, Yutong1,2; Lu, Shun1; Song, Cheng1; Liu, Hong1,2
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| 2023-11-15 | |
| 摘要 | This study presents the determination of the dissociation constant (pK(a)) and diffusion coefficient (D) for 21 weak acids (WAs) using the electrochemical acid-base transport limitation (eABTL) method. The measurements are straightforward and based on the mathematical relationships of the eATBL response, with the merits of saving time and eliminating the need for complex instruments and algorithms. The measurements of the pK(a) values demonstrated high repeatability with most relative standard derivation (RSD) values below 1%. The determined D values exhibited a reasonable magnitude order of 10(-10) m(2)/s, considering the influence of the ionic strength. For the WAs that did not meet the application prerequisites of the eABTL method well, their pK(a) and D values could still be measured, and the results were apt for describing acid-base transport processes. Notably, the observed D values using this approach were of a new form, representing the average of the conjugate acid-base pair. Its independence from the dissociation degree and analyte concentration makes it a valuable and versatile parameter in various applications. |
| DOI | 10.1021/acs.iecr.3c02856 |
| 发表期刊 | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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| ISSN | 0888-5885 |
| 卷号 | 62期号:47页码:20071-20082 |
| 通讯作者 | Liu, Hong(liuhong@cigit.ac.cn) |
| 收录类别 | SCI |
| WOS记录号 | WOS:001111117200001 |
| 语种 | 英语 |
