[Degradation of microcystin-RR by ozonation process].
Degradation of algal toxin Microcystin-RR (MC-RR) by ozonation processes was investigated. The degradation rate of MC-RR reached 83.0% at ozone/MC-RR dosage of 6, and the degradation efficiency was decreased with increase of pH or NOM contents. Ozonation byproducts of MC-RR under different ozone dosages were detected by HPLC-MS to elucidate degradation mechanisms and pathways. The results showed that MC-RR degradation by attacking of ozone and hydrogen radicals mainly involved in substitution and cleavage of the Adda conjugated diene structure, cleavage of the peptide bond between Mdha and Ala. And Adda degradation pathway exerted a dominant position during the process.
Miao
Heng-feng
HF
School of Environment and Civil Engineering, Jiahgnan University, Wuxi 214122, China. hfmiao@yahoo.com.cn
Zhou
Qin
Q
Wang
Zhi-liang
ZL
Yan
Qun
Q
Ruan
Wen-quan
WQ
D001673:Biodegradation, Environmental; D000458:Cyanobacteria / Q000378:metabolism; D008387:Marine Toxins; D052998:Microcystins / Q000737:chemistry* / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D014873:Water Pollutants / Q000737:chemistry* / Q000302:isolation & purification
D008387:Marine Toxins; D052998:Microcystins; D014873:Water Pollutants; D010126:Ozone; C063855:microcystin RR