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Bromamine decomposition kinetics in aqueous solutions.

Hongxia Lei1, Benito J Mariñas, Roger A Minear

  • 1Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, Urbana, Illinois 61801, USA.

Environmental Science & Technology
|April 29, 2004
PubMed
Summary

This study investigates bromamine decomposition kinetics, revealing a reaction scheme involving monobromamine disproportionation and subsequent decomposition. Catalysis by acids and bases was quantified using the Brønsted relationship.

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Area of Science:

  • Environmental Chemistry
  • Chemical Kinetics
  • Water Chemistry

Background:

  • Bromamines are disinfection byproducts formed during water treatment.
  • Understanding bromamine decomposition is crucial for water quality management.
  • Previous studies have not fully elucidated the complex reaction pathways and kinetics.

Purpose of the Study:

  • To investigate the kinetics of bromamine decomposition.
  • To identify the relevant reaction pathways and mechanisms.
  • To determine the catalytic roles of various species in these reactions.

Main Methods:

  • Stopped-flow spectrophotometry was employed to monitor reaction progress.
  • Experiments were conducted across a range of pH, reactant concentrations, and buffer types.

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  • Kinetic data were analyzed to determine rate constants and catalytic terms.

    • Main Results:

    • A reaction scheme involving reversible monobromamine disproportionation and irreversible decomposition was proposed.
    • Monobromamine disproportionation follows general acid catalysis.
    • Subsequent decomposition reactions exhibit base catalysis.
    • Catalysis by H+, NH4+, H2PO4-, HCO3-, H2O, HPO4(2-), OH-, and CO3(2-) was quantified.
    • Brønsted relationship was used to fit rate constants and predict undetermined values.

    Conclusions:

    • The study provides a comprehensive kinetic model for bromamine decomposition.
    • Identified reaction pathways and catalytic mechanisms enhance understanding of bromamine fate in aquatic systems.
    • Results aid in predicting and controlling bromamine levels in water treatment processes.