Original Article:
An overview of bromate formation in chemical oxidation processes: Occurrence, mechanism, influencing factors, risk assessment, and control strategies
Jingxin Yang, et al.
Chemosphere,2019, 237, 124521.
10.1016/j.chemosphere.2019.124521
Bromate refers to a class of compounds containing bromate ions (BrO3-). Common bromates include calcium bromate, barium bromate, magnesium bromate, and lithium bromate, etc. Although bromates are valuable oxidizing agents and brominating agents, they are also a common by-product of ozone-based disinfection water treatment processes and have attracted considerable attention. In this work, the authors review the mechanism, influencing factors, risk assessment, and control strategies of bromate formation during chemical oxidation.
Mechanism of Bromate Formation
HOBr/-OBr is a key intermediate in bromate formation during chemical oxidation. The main mechanism of bromate formation can be divided into two stages: (1) conversion of Br- to HOBr/-OBr, and (2) further conversion of HOBr/-OBr to bromate.
Factors Affecting the Bromate Formation
1. Increased oxidant dose may favor bromate formation.
2. The higher the initial concentration of bromide, the higher the amount of bromate produced.
3. Solution pH affects oxidant stability, protonation of bromine, and formation of potential secondary oxidants.
4. Bicarbonate/carbonate are ubiquitous anions in water, and their influence on bromate formation during ozonation remains controversial.
5. Some coexisting ions (such as phosphate, chloride, sulfate, and silicate) play a negative role in the formation of bromate in some oxidation processes.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM10102757 | Calcium bromate |  |
10102-75-7 | Price |
| ACM10326268 | Barium bromate monohydrate. |  |
10326-26-8 | Price |
| ACM14519176 | Magnesium bromate |  |
14519-17-6 | Price |
