A novel electrochemical method determining pKa and transport parameters of buffers using acid-base transport limitation response

Yin, Fengjun; Hu, Yutong; Lu, Shun; Yang, Xiaohui; Song, Cheng; Liu, Hong

doi:10.1016/j.electacta.2023.143373

Cited by 2 publications

(9 citation statements)

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“…The extracted data sets of j B,l vs pH b and the nonlinear fitting results are given in the insets. (f) Comparison between reference values and the average p K a values estimated in Figure a–e; the value for acetic acid was determined previously …”

Section: Resultsmentioning

confidence: 99%

“…Figure 6f shows the estimated pK a values, including those for benzoic acid and phosphoric acid, which were determined previously. 25 The repeatability of the pK a determinations of EDTA, malonic acid, phosphoric acid, phosphorus acid, and sulfurous acid was very high, as they had RSD values that did not exceed 0.18%, comparable to those for the VFAs.…”

Section: Vfasmentioning

confidence: 86%

“…This work reports the pK a and D values of 21 WAs that can be found in our laboratory, including six VFAs (formic, acetic, propionic, butyric, valeric, and lactic acids), six bioproducts (pyruvic, gluconic, tartaric, oxalic, glyceric, and malic acids), two acidic amino acids (glutamic and aspartic acids), three synthetic organic acids (benzoic, malonic, and ethylenediaminetetraacetic acids (EDTA)), and four inorganic acids (phosphoric, phosphorus, sulfurous, and nitrous acids). Of these WAs, the acetic, benzoic, and phosphoric acids were measured previously, 25 and the remaining 18 acids were measured in this study. The buffer solutions for each acid were prepared using analytically pure sodium salts.…”

Section: Electrochemical Experiments and The Weak Acids Ofmentioning

confidence: 99%

“…The eABTL method has three prerequisites that need to be met for accurate results: 25 (i) the WA being investigated must be electrochemically inert enough, (ii) the pK a value must be within a suitable range so that j l can be measured, and (iii) the WA should either have a single dissociation process or be able to be treated as having such. Among the 21 WAs reported in this study, the VFAs, oxalic acid, gluconic acid, glyceric acid, EDTA, phosphoric acid, and phosphorous acid meet these prerequisites well, and hence, the determined parameter values for these WAs are repeatable and reliable.…”

Section: Vfasmentioning

confidence: 99%

“…The extracted data sets of j l vs C B are shown in the insets. (f) The average D B values determined from Figure 7a−e; the values for benzoic acid and phosphoric acid were determined previously 25.…”

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confidence: 99%

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Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Yin,

Liu,

et al. 2023

Ind. Eng. Chem. Res.

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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 m2/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.

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Section: Resultsmentioning

confidence: 99%

Section: Vfasmentioning

confidence: 86%

Section: Electrochemical Experiments and The Weak Acids Ofmentioning

confidence: 99%

Section: Vfasmentioning

confidence: 99%

mentioning

confidence: 99%

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Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Yin,

Liu,

et al. 2023

Ind. Eng. Chem. Res.

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Electrochemical Acid–Base Transport Limitation Principle for Low Electroactive Analyte Sensing in Wastewater Monitoring

Yin,

Liu,

Yang

et al. 2024

Environ. Sci. Technol.

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Electrochemical sensing (ES) is crucial for improving data acquisition in wastewater treatment, but obtaining the signal for a low electroactive analyte is challenging. Here, we propose an electrochemical acid−base transport limitation (eABTL) principle for inertness-based sensing, offering a new insight into generating ES signals from an interfacial transport process rather than electron transfer. This principle enables potential ES application for various weak acids and bases (WABs) without reactions themselves. We established an eABTL P method for detecting orthophosphate in solutions as a proof of concept, demonstrating commendable accuracy and precision, and a wide detection range from 10 μM to over 300 mM. Endogenous interferences were identified using 23 weak acids, indicating no significant endogenous interfering factors in typical wastewaters. Of them, volatile fatty acids are the main interference, but their effect can be eliminated by adjusting pH above 6.0. Exogenous factors like anions, cations, ion strength, temperature, organic load, and dissolved oxygen were examined, and most of their effects can be ignored by maintaining consistent analytical procedures between calibration curve and sample. Furthermore, measurement of wastewater samples confirmed the applicability toward domestic wastewater and demonstrated its wide applicability when combined with digestion pretreatment. Given the merits of inertness-based sensing, the eABTL-based methods have the potential to be a crucial part of ES techniques for environmental and industrial monitoring.

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A novel electrochemical method determining pKa and transport parameters of buffers using acid-base transport limitation response

Cited by 2 publications

References 42 publications

Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Electrochemical Acid–Base Transport Limitation Principle for Low Electroactive Analyte Sensing in Wastewater Monitoring

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A novel electrochemical method determining pKa and transport parameters of buffers using acid-base transport limitation response

Cited by 2 publications

References 42 publications

Determining pKa and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Determining pKa and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Electrochemical Acid–Base Transport Limitation Principle for Low Electroactive Analyte Sensing in Wastewater Monitoring

Contact Info

Product

Resources

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Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method

Determining pK_a and a New Total Diffusion Coefficient for Weak Acids via the Electrochemical Acid–Base Transport Limitation Method