Related Experiment Video
Updated: Jul 11, 2026

A Generalized Method for Determining Free Soluble Phenolic Acid Composition and Antioxidant Capacity of Cereals and Legumes
Published on: June 10, 2022
Rapid determination of phenolic compounds in water samples by alternating-current oscillopolarographic titration
Jun-Ping Xiao1, Xue-Feng Wang, Qing-Xiang Zhou
1Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Abstract:
A rapid, simple and sensitive method was demonstrated for the determination of phenolic compounds in water samples by alternating-current oscillopolarographic titration. With the presence of sulfuric acid, phenol could be transferred into a nitroso-compound by reacting with NaNO2. The titration end-point was obtained by the formation of a sharp cut in the oscillopolarographic with infinitesimal NaNO2 on double platinum electrodes. The results showed that phenol concentration had an excellent linear relationship over the range of 4.82 x 10(-6)-9.65 x 10(-3) mol/L, the RSD of the proposed method was lower than 1.5%, and the spiked recoveries of three real water samples were in the range of 95.6%-106.9%.
More Related Videos
Related Concept Videos
Voltammetric Techniques: Linear-Scan (E vs Time)
Controlled-Current Coulometry: Coulometric Titration
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
Controlled-Potential Coulometry: Electrolytic Methods
The chosen potential ensures...
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...
Controlled-Current Coulometry: Overview
Measuring Reaction Rates

