Chen Xiaoguo, Xiao Bangding, Liu Jiantong, Fang Tao, Xu Xiaoqing
Wuhan University of Technology, People's Republic of China.
Toxicon. 2005 Jun 1;45(7):911-7. doi: 10.1016/j.toxicon.2005.02.011. Epub 2005 Apr 1.
The occurrence of the microcystins in the water bodies, especially in drinking water resources, has received considerable attentions. In situ chemical oxidation is a promising cost-effective treatment method to remove MC from water body. This research investigated the reaction kinetics of the oxidation of MCRR by permanganate. Experimental results indicate that the reaction is second order overall and first order with respect to both permanganate and MCRR, and has an activation energy of 18.9 kJ/mol. The second-order rate constant ranges from 0.154 to 0.225 l/mg/min at temperature from 15 to 30 degrees C. The MCRR degradation rates can be accelerated through increasing reaction temperature and oxidant concentration. The reaction under acid conditions was slightly faster than under alkaline conditions. The half-life of the reaction was less than 1min, and more than 99.5% of MCRR was degraded within 10min.
水体中微囊藻毒素的出现，尤其是在饮用水源中，已受到相当多的关注。原位化学氧化是一种很有前景的、具有成本效益的从水体中去除微囊藻毒素的处理方法。本研究考察了高锰酸钾氧化MCRR的反应动力学。实验结果表明，该反应总体上为二级反应，对高锰酸钾和MCRR均为一级反应，活化能为18.9 kJ/mol。在15至30摄氏度的温度下，二级反应速率常数范围为0.154至0.225 l/mg/min。通过提高反应温度和氧化剂浓度可以加速MCRR的降解速率。酸性条件下的反应比碱性条件下略快。反应的半衰期小于1分钟，在10分钟内MCRR的降解率超过99.5%。
