A reagent-free acid-base titration method via an electrodialytic titrant generator

Area of Science:

• Analytical Chemistry
• Electrochemistry

Background:

• Traditional acid-base titrations often require reagent preparation and standardization.
• Electrodialysis is a known technique for producing high-purity eluents in ion chromatography.

Purpose of the Study:

• To introduce a reagent-free acid-base titration method using an electrodialytic titrant generator (ETG).
• To demonstrate the accuracy, precision, and applicability of ETG titration.

Main Methods:

• Utilized an electrodialytic eluent generator (ETG) for online production of acid and base titrants.
• Generated titrants including potassium hydroxide, methanesulfuric acid, and sulfuric acid.
• Validated ETG titration results against conventional methods.

Main Results:

• Accurately and reproducibly produced titrants up to 140 mM concentration.
• Achieved high purity for the potassium hydroxide titrant.
• Demonstrated good agreement between ETG titration and conventional methods (ratio 0.9918–1.0034).
• Obtained good accuracy (2.2% relative error) and precision (0.17% relative standard error).

Conclusions:

• ETG is a viable technique for reagent-free acid-base titrations.
• The method offers high accuracy and precision for chemical analysis.
• Demonstrated utility in measuring pKa-differentiated capacity of anion exchange resins.