Rate of hypobromite formation in chlorinated seawater

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Andrew Bousher
  • Peter Brimblecombe
  • Derek Midgley

Detail(s)

Original languageEnglish
Pages (from-to)865-870
Journal / PublicationWater Research
Volume20
Issue number7
Publication statusPublished - Jul 1986
Externally publishedYes

Abstract

The factors affecting the rate of formation of hypobromite ion in chlorinated seawater have been investigated. Apart from the expected oxidation of bromide by HOCl, the rate constant of which was found to be kH = 1.57 × 106 exp(-1.62 × 103/T) mol-1 dm3 s-1, the hypochlorite ion-pairs formed with the major cations were found to provide another reaction pathway. The ratios k′m = km Km mol-2 dm6 s-1, where km is the rate constant and Km the ion-pair formation constant, were as follows: CaOCl+, 1.7 × 104; MgOCl+, 4.2 × 103; NaOCl°, 12; KOCl°, 3 and these enabled the effect of the presence of the metal ions on the overall rate to be calculated. In natural seawater the ion-pairs provide about 3.5% of the hypobromite production, but at higher pH, as in many laboratory studies, this proportion would increase. Transition metal ions (Fe3+, Cr3+, Co2+, Ni2+, Cu2+, Zn2+) at the low concentrations (5 × 10-6 mol dm-3) that could be tested had no catalytic effect but Fe2+ and Mn2+ ions were themselves oxidized. © 1986.

Research Area(s)

  • catalysis, chlorination, hypobromite formation, metal-hypochlorite ion pairs, rate constant, seawater

Citation Format(s)

Rate of hypobromite formation in chlorinated seawater. / Bousher, Andrew; Brimblecombe, Peter; Midgley, Derek.

In: Water Research, Vol. 20, No. 7, 07.1986, p. 865-870.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal