Oxidation of cyanobacterial neurotoxin beta-N-methylamino-L-alanine (BMAA) with chlorine, permanganate, ozone, hydrogen peroxide and hydroxyl radical

Yi Ting Chen, Wan Ru Chen, Tsair Fuh Lin

研究成果: Article同行評審

14 引文 斯高帕斯(Scopus)

摘要

Beta-N-methylamino-L-alanine (BMAA), a new cyanobacterial neurotoxin produced by more than 20 genera of cyanobacteria, has been associated with amyotrophic lateral sclerosis/parkinsonism–dementia complex (ALS/PDC) or Alzheimer's disease. Although BMAA has been shown to be removed in drinking water treatment plants (DWTPs), studies regarding the reactions between BMAA and the commonly used oxidants in DWTPs are limited to chlorine under specific conditions. In this study, the reaction kinetics between BMAA and five oxidants commonly used in DWTPs, including chlorine, potassium permanganate, ozone, hydrogen peroxide and hydroxyl radical were investigated. The oxidation of BMAA by chlorine, ozone or OH radical followed the second order reaction rate law, and the reaction rate was in the order of OH radicals > ozone >> chlorine. The rate constants increased by 20 times from 2 × 103 M−1s−1 at pH 5.8 to 4.93 × 104 M−1s−1 at pH 7, and kept in a relatively stable level at pH 7–9.5; rate constants of OH radicals were 1.11 × 108 M−1s−1 at pH 6.5 and 5.51 × 109- 1.35 × 1010 M−1s−1 at pH > 6.5. For both permanganate and H2O2 only, the removal of BMAA was negligible. The pH dependency of chlorine and the OH radical may be attributed to the neutral form of BMAA with free lone pair electrons readily to be attacked by oxidants. However, for ozonation of BMAA, the rate constants were 1.88 × 106–3.72 × 1010 M−1s−1, with a linear dependency on pH, implying that the hydroxide concentration governs the reaction. In addition, the rate of BMAA degradation was found to be slower in natural water if compared with that in deionized water.

原文English
頁(從 - 到)187-195
頁數9
期刊Water Research
142
DOIs
出版狀態Published - 2018 10月 1

All Science Journal Classification (ASJC) codes

  • 生態建模
  • 水科學與技術
  • 廢物管理和處置
  • 污染

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