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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F14%3A33152049%21RIV15-TA0-15310___
rdf:type
n12:Vysledek skos:Concept
rdfs:seeAlso
http://pubs.acs.org/doi/pdf/10.1021/es5030355
dcterms:description
The presence of the potent cyanotoxin, microcystin-LR (MC-LR), in drinking water sources poses a serious risk to public health. The kinetics of the reactivity of ferrate(VI) (FeVIO42?, Fe(VI)) with MC-LR and model compounds (sorbic acid, sorbic alcohol, and glycine anhydride) are reported over a range of solution pH. The degradation of MC-LR followed second-order kinetics with the bimolecular rate constant (kMCLR+Fe(VI)) decreasing from 1.3 +- 0.1 x 102 M?1 s?1 at pH 7.5 to 8.1 +- 0.08 M?1 s?1 at pH 10.0. The specific rate constants for the individual ferrate species were determined and compared with a number of common chemical oxidants employed for water treatment. Detailed product studies using liquid chromatography?mass spectrometry/mass spectrometry (LC?MS/MS) indicated the oxidized products (OPs) were primarily the result of hydroxylation of the aromatic ring, double bond of the methyldehydroalanine (Mdha) amino acid residue, and diene functionality. Products studies also indicate fragmentation of the cyclic MC-LR structure occurs under the reaction conditions. The analysis of protein phosphatase (PP1) activity suggested that the degradation byproducts of MC-LR did not possess significant biological toxicity. Fe(VI) was effective for the degradation MC-LR in water containing carbonate ions and fulvic acid (FA) and in lake water samples, but higher Fe(VI) dosages would be needed to completely remove MC-LR in lake water compared to deionized water The presence of the potent cyanotoxin, microcystin-LR (MC-LR), in drinking water sources poses a serious risk to public health. The kinetics of the reactivity of ferrate(VI) (FeVIO42?, Fe(VI)) with MC-LR and model compounds (sorbic acid, sorbic alcohol, and glycine anhydride) are reported over a range of solution pH. The degradation of MC-LR followed second-order kinetics with the bimolecular rate constant (kMCLR+Fe(VI)) decreasing from 1.3 +- 0.1 x 102 M?1 s?1 at pH 7.5 to 8.1 +- 0.08 M?1 s?1 at pH 10.0. The specific rate constants for the individual ferrate species were determined and compared with a number of common chemical oxidants employed for water treatment. Detailed product studies using liquid chromatography?mass spectrometry/mass spectrometry (LC?MS/MS) indicated the oxidized products (OPs) were primarily the result of hydroxylation of the aromatic ring, double bond of the methyldehydroalanine (Mdha) amino acid residue, and diene functionality. Products studies also indicate fragmentation of the cyclic MC-LR structure occurs under the reaction conditions. The analysis of protein phosphatase (PP1) activity suggested that the degradation byproducts of MC-LR did not possess significant biological toxicity. Fe(VI) was effective for the degradation MC-LR in water containing carbonate ions and fulvic acid (FA) and in lake water samples, but higher Fe(VI) dosages would be needed to completely remove MC-LR in lake water compared to deionized water
dcterms:title
Oxidation of Microcystin-LR by Ferrate(VI): Kinetics, Degradation Pathways, and Toxicity Assessments Oxidation of Microcystin-LR by Ferrate(VI): Kinetics, Degradation Pathways, and Toxicity Assessments
skos:prefLabel
Oxidation of Microcystin-LR by Ferrate(VI): Kinetics, Degradation Pathways, and Toxicity Assessments Oxidation of Microcystin-LR by Ferrate(VI): Kinetics, Degradation Pathways, and Toxicity Assessments
skos:notation
RIV/61989592:15310/14:33152049!RIV15-TA0-15310___
n3:aktivita
n16:P n16:I
n3:aktivity
I, P(ED2.1.00/03.0058), P(TE01020218)
n3:cisloPeriodika
20
n3:dodaniDat
n14:2015
n3:domaciTvurceVysledku
n10:9251189
n3:druhVysledku
n13:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
35528
n3:idVysledku
RIV/61989592:15310/14:33152049
n3:jazykVysledku
n17:eng
n3:klicovaSlova
Assessments; Toxicity; Pathways; Degradation; Kinetics; FerrateVI; Microcystin-LR; Oxidation
n3:klicoveSlovo
n7:Degradation n7:Toxicity n7:Assessments n7:Kinetics n7:Microcystin-LR n7:FerrateVI n7:Pathways n7:Oxidation
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[559C923B8F83]
n3:nazevZdroje
Environmental Science & Technology
n3:obor
n18:CC
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
10
n3:projekt
n8:TE01020218 n8:ED2.1.00%2F03.0058
n3:rokUplatneniVysledku
n14:2014
n3:svazekPeriodika
48
n3:tvurceVysledku
Zbořil, Radek Gardinali, Piero R Maršálek, Blahoslav Jasa, Libor Chen, Long Batchu, Sudha Rani Dionysiou, Dionysios D O'Shea, Kevin E Sharma, Virender Kumar Jiang, Wenjun
n3:wos
000343640900051
s:issn
0013-936X
s:numberOfPages
9
n6:doi
10.1021/es5030355
n20:organizacniJednotka
15310