Related Experiment Video
Updated: Jul 4, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron (Oxy)Hydroxides, Trace Elements, and Bacteria
Published on: December 19, 2017
Effect of Fe(III) on the bromate reduction by humic substances in aqueous solution
1State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China. sally.xieli@gmail.com
Abstract:
Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the matrix of bromate and Fe(III) solutions and the role of Fe(III) in this redox process. The results showed that the humic acid regenerated Fe(II) and reduced bromate abiotically. The addition of Fe(III) could accelerate the bromate reduction rate by forming humic acid-Fe(III) complexes. Iron species acts as electron mediator and catalyst for the bromate reduction by humic acid, in which humic acid transfers electrons to the complexed Fe(III) to form Fe(II), and the regenerated Fe(II) donate the electrons to bromate. The kinetics study on bromate reduction further indicated that bromate reduction by humic acid-Fe(III) complexes is pH dependent. The rate decreased by 2-fold with the increase in solution pH by one unit. The reduction capacity of Aldrich humic acid was observed to be lower than that of humic acid or natural organic matter of Suwanne River, indicating that such redox process is expected to occur in the environment.
More Related Videos
Related Concept Videos
Redox Titration: Other Oxidizing and Reducing Agents
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Microbial Bioremediation of Uranium
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

