Degradation of microcystin-RR by UV radiation in the presence of hydrogen peroxide

Qiao, Ru; Li, Nan; Qi, Xinhua; Wang, Qishan; Zhuang, Yanpei

doi:10.1016/j.toxicon.2005.01.012

Cited by 109 publications

(64 citation statements)

References 42 publications

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“…k 1 was increased with increasing initial potassium peroxydisulfate concentration. Similar results were also obtained by former studies [36][37][38]. Khataee et al investigated the decolorization of basic blue by UV/peroxydisulfate treatment.…”

Section: Effect Of Initial Peroxydisulfate Concentrationsupporting

confidence: 85%

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

2016

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Methyldiethanolamine (MDEA) as an organic material is a hazardous contaminant in the aquatic environment because of its adverse effects on aquatic life, environment, and humans. In this study, a batch reactor of ultraviolet (UV) light and peroxydisulfate was performed to investigate the degradation of MDEA in aqueous media. The effect of different experimental parameters such as UV irradiation, peroxydisulfate concentration, MDEA concentration, temperature, and solution pH on removal of MDEA was evaluated precisely. No significant degradation was observed with a separate UV light. Adding peroxydisulfate to the solution increased the removal performance more than 75 %.

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Section: Effect Of Initial Peroxydisulfate Concentrationsupporting

confidence: 85%

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

2016

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“…The three rates were found to be statistically different (p < 0.05). Qiao et al (2005) [76], reported that up to 94.8% of 0.72 mg·L −1 MC-RR were removed only after 60 min of exposure to 1 mmol·L −1 H2O2 (34 mg·L −1 ) under 36.6 W·m −2 . Walker (2014) [77] observed that H2O2 was not able to degrade MC-LR without the addition of a UV light source.…”

Section: Resultsmentioning

confidence: 99%

Impacts of Hydrogen Peroxide and Copper Sulfate on the Control of Microcystis aeruginosa and MC-LR and the Inhibition of MC-LR Degrading Bacterium Bacillus sp.

Kansole

Lin

2017

Water

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Abstract:Laboratory batch experiments were carried out to evaluate the impacts of H 2 O 2 and copper sulfate on M. aeruginosa PCC7820, microcystin-LR (MC-LR) and its degrading bacteria Bacillus sp., previously isolated from Hulupi Lake in Taiwan. The study shows that 3 mg·L −1 hydrogen peroxide removed only 9% M. aeruginosa within seven days of exposure, from an initial cell concentration of 2 × 10 6 cells/mL. With copper sulfate, a concentration of 2 mg·L −1 removed 99% M. aeruginosa cells, but showed negligible efficacy in removing 0.05 mg·L −1 MC-LR. At a higher dosage, 20 mg·L −1 H 2 O 2 led to 40% and 95% removal, respectively for MC-LR and M. aeruginosa cells. Copper sulfate and H 2 O 2 were both lethal to Bacillus sp. population, with mortality rate constants of k = 0.04 h −1 and 0.03 h −1 under 1 mg·L −1 copper sulfate and 5 mg·L −1 H 2 O 2 , respectively. H 2 O 2 is competitive in terms of cost, with a capability of degrading organic compounds with the assistance of ultraviolet (UV) light, and it may be considered as an alternative algaecide to copper sulfate in reservoirs for algae growth control.

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“…More than 60 different analogues of MCs have been isolated from natural blooms or laboratory cultures of cyanobacteria [9] in which the most common and toxic analog is microcystin-LR (MC-LR) [10][11][12][13]. (2S,3S,8S,9S)-3-amino-9-methoxy-2,4,6-trimethyl-10-phenyldeca-4,6-dienoic dienoic acid (Adda) as one of the constituent amino acids in MC-LR is essential for the characteristic biologic activities of MCs [14,15].…”

Section: Introductionmentioning

confidence: 99%

Microcystin-LR biodegradation by Sphingopyxis sp. USTB-05

Xiao

Yan

Wang

et al. 2010

Front. Environ. Sci. Eng. China

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A promising bacterial strain for biodegrading microcystin-LR (MC-LR) as the sole carbon and nitrogen source was successfully isolated from Lake Dianchi, China. The strain was identified as Sphingopyxis sp. USTB-05, which was the first isolated MCs-biodegrading Sphingopyxis sp. in China. The average biodegradation rate of MC-LR by Sphingopyxis sp. USTB-05 was 28.8 mg$L -1 per day, which was apparently higher than those of other bacteria reported so far. The optimal temperature and pH for both strain USTB-05 growth and MC-LR biodegradation were 30°C and 7.0, respectively. The release of MC-LR from the cyanobacterial cells collected from Lake Guishui and the biodegradation of MC-LR by both strain and cell-free extract (CE) were investigated. The results indicated that MC-LR with the initial concentration of 4.0 mg$L -1 in water was biodegraded by Sphingopyxis sp. USTB-05 within 4 d, while MC-LR with the initial concentration of 28.8 mg$L -1 could be completely removed in 3 h by CE of Sphingopyxis sp. USTB-05 containing 350 mg$L -1 protein. During enzymatic biodegradation of MC-LR, two intermediate metabolites and a dead-end product were observed on an HPLC chromatogram. Moreover, the similar scanning profiles of MC-LR and its metabolic products indicate that the Adda side-chain of MC-LR was kept intact in all products.

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Degradation of microcystin-RR by UV radiation in the presence of hydrogen peroxide

Cited by 109 publications

References 42 publications

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

Impacts of Hydrogen Peroxide and Copper Sulfate on the Control of Microcystis aeruginosa and MC-LR and the Inhibition of MC-LR Degrading Bacterium Bacillus sp.

Microcystin-LR biodegradation by Sphingopyxis sp. USTB-05

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