Kinetics of microcystin-LR oxidation by ozone

被引：61

作者：

Shawwa, AR

Smith, DW

机构：

[1] Gore & Storrie Ltd, Toronto, ON M2J 5B6, Canada

[2] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2M8, Canada

来源：

OZONE-SCIENCE & ENGINEERING | 2001年 / 23卷 / 02期

关键词：

ozone; cyanobacteria; kinetics; microcystin-LR; ozonation rate; reaction order; toxins; drinking water treatment;

D O I：

10.1080/01919510108961998

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The oxidation kinetics of the reaction between dissolved ozone and microcystin-LR, in acidic and neutral buffer solutions over the temperature range of 10 to 30 degreesC was investigated. Also, the effect of natural organic matter (NOM) on the oxidation of microcystin-LR by ozone was evaluated. The reaction is very rapid and the overall kinetics can be modeled as a second order, with first order in each concentration of ozone and pure microcystin-LR. At 20 degreesC, the overall rate constant ranged from 3.4x10(4) to 1.0x10(5) M(-1)s(-1) as the solution pH changed from 7 to 2. As the temperature increased from 10 to 30 degreesC, the average overall rate constant increased from 5.8x10(4) to 1.6x10(5) M(-1)s(-1) at pH value of 2. A distinct lag before the oxidation of microcystin-LR, in the presence of NOM, was observed as DOC increased from 1 to 5 mg/L.

引用

页码：161 / 170

页数：10

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