title: [Degradation of microcystin-RR by ozonation process].
abstract: 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.
authors.affiliation: School of Environment and Civil Engineering, Jiahgnan University, Wuxi 214122, China. hfmiao@yahoo.com.cn
authors.forename: Heng-feng
authors.initials: HF
authors.lastname: Miao
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhou
authors.forename: Zhi-liang
authors.initials: ZL
authors.lastname: Wang
authors.forename: Qun
authors.initials: Q
authors.lastname: Yan
authors.forename: Wen-quan
authors.initials: WQ
authors.lastname: Ruan
mesh_terms: 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
chemical_list: D008387:Marine Toxins; D052998:Microcystins; D014873:Water Pollutants; D010126:Ozone; C063855:microcystin RR