Immediate and long-term impacts of potassium permanganate on photosynthetic activity, survival and microcystin-LR release risk of Microcystis aeruginosa

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• 作者：Huase Ou^a ; Naiyun Gao^a ; ^{naiyungao@yahoo.com.cn} ; Chaohai Wei^b ; Yang Deng^c ; Junlian Qiao^a
• 关键词：Potassium permanganate ; Cyanobacteria ; Photosynthesis ; Microcystis aeruginosa ; Microcystin-LR
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 June, 2012
• 卷：219-220
• 期：Complete
• 页码：267-275
• 文件大小：1317 K

摘要

The immediate and long-term impacts of potassium permanganate (KMnO₄) as pre-oxidant on Microcystis aeruginosa and microcystin-LR (MC-LR) release risk were investigated. The cell density and the integrity of M. aeruginosa were determined by a flow cytometry, and typical photosynthetic parameters were measured by a pulse amplitude modulated fluorometer. The photosynthetic parameters were reduced to different degrees, accompanied with slight cytoclasis and complete degradation of extracellular MC-LR immediately after various dosages KMnO₄ oxidation (2-20 mg L^鈭?). In a 6-d cultivation following 5 mg L^鈭? KMnO₄ oxidation, the cell density decreased from 3.9 脳 10⁶ to 0.6 脳 10⁶ cells mL^鈭?, and then increased to 0.9 脳 10⁶ cells mL^鈭?, while the extracellular MC-LR increased from 0 to 51.2 渭g L^鈭?. In the cultivation after 10 mg L^鈭? KMnO₄ treatment, the intracellular MC-LR and cell activity significantly declined, while significant cytoclasis (cell density from 3.8 脳 10⁶ to 0 cells mL^鈭?) and MC-LR release (increase from 0 to 15.2 渭g L^鈭?) were observed. The photosynthetic parameters were found to be useful tools to predict the recovery tendency of M. aeruginosa cells, and the MC-LR release risk should be considered during KMnO₄ pre-oxidation in water-treatment plants.