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[PMID]:28679477
[Au] Autor:Huang X; Zhou X; Zhou J; Huang Z; Liu S; Qian G; Gao N
[Ad] Endereço:School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
[Ti] Título:Bromate inhibition by reduced graphene oxide in thermal/PMS process.
[So] Source:Water Res;122:701-707, 2017 Oct 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bromate (BrO ), as a contaminant producing from bromide (Br ) oxidation, has been revealed for generation in sulfate radical involved processes. In this work, reduced graphene oxide (rGO) was firstly applied to inhibit the formation of BrO in thermally activated peroxymonosulfate (thermal/PMS) treatment. In the presence of 5-35 mg/L rGO, the decomposition rate of PMS was slightly increased from 0.0162 ± 0.0013 min to 0.0200 ± 0.0010 min , corresponding to removal rate of target pollutant increasing from 0.0157 ± 0.0012 min to 0.0204 ± 0.0022 min . This suggested the decay of PMS, the concentration and distribution of radicals were not influenced dramatically by the addition of rGO, which was partly supported by the almost unchanged HPLC chromatograms as compared with that in the absence of rGO. However, the produced BrO was significantly lowered by 67%-100% with the addition of rGO in a wide range of pH at 5-9 and activation temperature at 60-80 °C. Moreover, a quick reduction of hypobromous acid (HOBr) to Br was achieved with addition of rGO at room temperature, whilst no abatement of BrO and Br was observed in the same conditions. Therefore, masking HOBr was probably the role of rGO on bromate inhibition in thermal/PMS process. Because HOBr is a requisite intermediate for BrO , the inhibition effect of rGO is likely irrelevant of oxidation processes, which was inevitably showed by the good performance of rGO on BrO suppress in ozonation. Therefore, the addition of rGO in tens of mg/L is a promising measure to avoid the formation of unwanted bromine species in advanced oxidation processes.
[Mh] Termos MeSH primário: Bromatos/química
Grafite/química
Purificação da Água
[Mh] Termos MeSH secundário: Brometos
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Bromides); 7782-42-5 (Graphite)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170707
[St] Status:MEDLINE


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[PMID]:28671197
[Au] Autor:Li J; Shi M; Ma B; Zheng Y; Niu R; Li K
[Ad] Endereço:School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei Province 066004, China. likun@ysu.edu.cn.
[Ti] Título:Protective effects of fraction 4a of polysaccharides isolated from Lycium barbarum against KBrO -induced renal damage in rats.
[So] Source:Food Funct;8(7):2566-2572, 2017 Jul 19.
[Is] ISSN:2042-650X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Potassium bromate (KBrO ) is widely used as a food additive and is a major by-product of water disinfection. The aim of this study was to investigate the protective effects of fraction 4a of polysaccharides isolated from Lycium barbarum (LBP-4a) against renal damage induced by KBrO in rats and to determine the relevant mechanisms behind these effects. Male Wistar rats were divided into a normal control group, a KBrO control group, and LBP-4a(L) and LBP-4a(H) groups. With the exception of the normal control group, the rats in the other three groups were administered KBrO by intraperitoneal injection to induce renal damage. Before the induction of renal damage, rats in the LBP-4a(L) and LBP-4a(H) groups were pretreated with 50 mg per kg b.w. or 100 mg per kg b.w. LBP-4a, respectively, by intragastric administration. Clinical biochemical parameters and markers of oxidative damage were also determined. Treatment by administration of LBP-4a prior to challenge with KBrO prevented increases in the levels of nitrite, creatinine, urea nitrogen and uric acid in serum and increased the activities of antioxidant enzymes in kidney tissues. A comet assay and FCS results showed that pretreatment with LBP-4a also alleviated DNA damage and decreases in mitochondrial membrane potentials in renal cells. Histological studies further supported the above results and showed extensive renal damage in animals treated with KBrO and greatly reduced tissue injury in groups pretreated with LBP-4a. In conclusion, LBP-4a exhibited protective effects against renal damage induced by KBrO , and the mechanism was closely correlated with a reduction in levels of lipid peroxidation and an increase in the activities of antioxidant enzymes in kidney tissues, which alleviated DNA damage and increased mitochondrial membrane potentials in renal cells. These observations provide the background for the further development of LBP-4a as a protective agent for use in the treatment of renal damage.
[Mh] Termos MeSH primário: Bromatos/toxicidade
Nefropatias/prevenção & controle
Lycium/química
Extratos Vegetais/administração & dosagem
Polissacarídeos/administração & dosagem
[Mh] Termos MeSH secundário: Animais
Dano ao DNA/efeitos dos fármacos
Seres Humanos
Rim/efeitos dos fármacos
Rim/metabolismo
Nefropatias/etiologia
Nefropatias/genética
Nefropatias/metabolismo
Peroxidação de Lipídeos/efeitos dos fármacos
Masculino
Estresse Oxidativo/efeitos dos fármacos
Extratos Vegetais/isolamento & purificação
Polissacarídeos/isolamento & purificação
Ratos
Ratos Wistar
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Plant Extracts); 0 (Polysaccharides); 04MB35W6ZA (potassium bromate)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170830
[Lr] Data última revisão:
170830
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170704
[St] Status:MEDLINE
[do] DOI:10.1039/c6fo01818a


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[PMID]:28601791
[Au] Autor:Bourgin M; Borowska E; Helbing J; Hollender J; Kaiser HP; Kienle C; McArdell CS; Simon E; von Gunten U
[Ad] Endereço:Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland.
[Ti] Título:Effect of operational and water quality parameters on conventional ozonation and the advanced oxidation process O /H O : Kinetics of micropollutant abatement, transformation product and bromate formation in a surface water.
[So] Source:Water Res;122:234-245, 2017 Oct 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The efficiency of ozone-based processes under various conditions was studied for the treatment of a surface water (Lake Zürich water, Switzerland) spiked with 19 micropollutants (pharmaceuticals, pesticides, industrial chemical, X-ray contrast medium, sweetener) each at 1 µg L . Two pilot-scale ozonation reactors (4-5 m h ), a 4-chamber reactor and a tubular reactor, were investigated by either conventional ozonation and/or the advanced oxidation process (AOP) O /H O . The effects of selected operational parameters, such as ozone dose (0.5-3 mg L ) and H O dose (O :H O = 1:3-3:1 (mass ratio)), and selected water quality parameters, such as pH (6.5-8.5) and initial bromide concentration (15-200 µg L ), on micropollutant abatement and bromate formation were investigated. Under the studied conditions, compounds with high second-order rate constants k >10 M s for their reaction with ozone were well abated (>90%) even for the lowest ozone dose of 0.5 mg L . Conversely, the abatement efficiency of sucralose, which only reacts with hydroxyl radicals (OH), varied between 19 and 90%. Generally, the abatement efficiency increased with higher ozone doses and higher pH and lower bromide concentrations. H O addition accelerated the ozone conversion to OH, which enables a faster abatement of ozone-resistant micropollutants. Interestingly, the abatement of micropollutants decreased with higher bromide concentrations during conventional ozonation due to competitive ozone-consuming reactions, except for lamotrigine, due to the suspected reaction of HOBr/OBr with the primary amine moieties. In addition to the abatement of micropollutants, the evolution of the two main transformation products (TPs) of hydrochlorothiazide (HCTZ) and tramadol (TRA), chlorothiazide (CTZ) and tramadol N-oxide (TRA-NOX), respectively, was assessed by chemical analysis and kinetic modeling. Both selected TPs were quickly formed initially to reach a maximum concentration followed by a decrease of their concentrations for longer contact times. For the studied conditions, the TP's concentrations at the outlet of the reactors ranged from 0 to 61% of the initial parent compound concentration, CTZ being a more persistent TP against further oxidation than TRA-NOX. Finally, it was demonstrated in both reactors that the formation of bromate (BrO ), a potentially carcinogenic oxidation by-product, could be controlled by H O addition with a general improvement on micropollutant abatement. Post-treatment by granular activated carbon (GAC) filtration enabled the reduction of micropollutants and TPs concentrations but no changes in bromate were observed. The combined algae assay showed that water quality was significantly improved after oxidation and GAC post-treatment, driven by the abatement of the spiked pesticides (diuron and atrazine).
[Mh] Termos MeSH primário: Poluentes Químicos da Água
Qualidade da Água
[Mh] Termos MeSH secundário: Bromatos
Peróxido de Hidrogênio
Cinética
Oxirredução
Ozônio
Suíça
Água
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 66H7ZZK23N (Ozone); BBX060AN9V (Hydrogen Peroxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170612
[St] Status:MEDLINE


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[PMID]:28570902
[Au] Autor:Fang J; Zhao Q; Fan C; Shang C; Fu Y; Zhang X
[Ad] Endereço:School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
[Ti] Título:Bromate formation from the oxidation of bromide in the UV/chlorine process with low pressure and medium pressure UV lamps.
[So] Source:Chemosphere;183:582-588, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:When a bromide-containing water is treated by the ultraviolet (UV)/chlorine process, hydroxyl radicals (HO) and halogen radicals such as Cl or Br are formed due to the UV photolysis of free halogens. These reactive species may induce the formation of bromate, which is a probable human carcinogen. Bromate formation in the UV/chlorine process using low pressure (LP) and medium pressure (MP) lamps in the presence of bromide was investigated in the present study. The UV/chlorine process significantly enhanced bromate formation as compared to dark chlorination. The bromate formation was elevated with increasing UV fluence, bromide concentration, and pH values under both LP and MP UV irradiations. It was significantly enhanced at pH 9 compared to those at pH 6 and 7 with MP UV irradiation, while it was slightly enhanced at pH 9 with LP UV. The formation by UV/chlorine process started with the formation of free bromine (HOBr/OBr ) through the reaction of chlorine and bromide, followed by a subsequent oxidation of free bromine and formation of BrO and bromate by reacting with radicals.
[Mh] Termos MeSH primário: Bromatos/análise
Brometos/análise
Cloro/química
Raios Ultravioleta
Poluentes Químicos da Água/análise
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Brometos/efeitos da radiação
Halogenação
Concentração de Íons de Hidrogênio
Radical Hidroxila
Oxirredução
Fotólise
Poluentes Químicos da Água/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Bromides); 0 (Water Pollutants, Chemical); 3352-57-6 (Hydroxyl Radical); 4R7X1O2820 (Chlorine)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170602
[St] Status:MEDLINE


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[PMID]:28319739
[Au] Autor:Tang S; Wang XM; Liu ST; Yang HW; Xie YF; Yang XY
[Ad] Endereço:State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, PR China; Energy and Environment International Centre, School of Energy and Power Engineering,
[Ti] Título:Mechanism and kinetics of halogenated compound removal by metallic iron: Transport in solution, diffusion and reduction within corrosion films.
[So] Source:Chemosphere;178:119-128, 2017 Jul.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A detailed kinetic model comprised of mass transport (k ), pore diffusion (k ), adsorption and reduction reaction (k ), was developed to quantitatively evaluate the effect of corrosion films on the removal rate (k ) of halogenated compounds by metallic iron. Different corrosion conditions were controlled by adjusting the iron aging time (0 or 1 yr) and dissolved oxygen concentration (0-7.09 mg/L DO). The k values for bromate, mono-, di- and tri-chloroacetic acids (BrO , MCAA, DCAA and TCAA) were 0.41-7.06, 0-0.16, 0.01-0.53, 0.10-0.73 h , with k values at 13.32, 12.12, 11.04 and 10.20 h , k values at 0.42-5.82, 0.36-5.04, 0.30-4.50, 0.30-3.90 h , and k values at 14.94-421.18, 0-0.19, 0.01-1.30, 0.10-3.98 h , respectively. The variation of k value with reaction conditions depended on the reactant species, while those of k , k and k values were irrelevant to the species. The effects of corrosion films on k and k values were responsible for the variation of k value for halogenated compounds. For a mass-transfer-limited halogenated compound such as BrO , an often-neglected k value primarily determined its k value when pore diffusion was the rate-limiting step of its removal. In addition, the value of k might influence product composition during a consecutive dechlorination, such as for TCAA and DCAA. For a reaction-controlled compound such as MCAA, an increased k value was achieved under low oxic conditions, which was favorable to improve its k value. The proposed model has a potential in predicting the removal rate of halogenated compounds by metallic iron under various conditions.
[Mh] Termos MeSH primário: Bromatos/isolamento & purificação
Cloroacetatos/isolamento & purificação
Ferro/química
Poluentes Químicos da Água/isolamento & purificação
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Bromatos/química
Cloroacetatos/química
Corrosão
Difusão
Cinética
Poluentes Químicos da Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Chloroacetates); 0 (Water Pollutants, Chemical); E1UOL152H7 (Iron)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170602
[Lr] Data última revisão:
170602
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170321
[St] Status:MEDLINE


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[PMID]:28314210
[Au] Autor:Soltermann F; Abegglen C; Tschui M; Stahel S; von Gunten U
[Ad] Endereço:Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland.
[Ti] Título:Options and limitations for bromate control during ozonation of wastewater.
[So] Source:Water Res;116:76-85, 2017 Jun 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Wastewater treatment plants (WWTPs) are important point sources for micropollutants, which are harmful to freshwater organisms. Ozonation of wastewater is a powerful option to abate micropollutants, but may result in the formation of the potentially toxic oxidation by-product bromate in bromide-containing wastewaters. This study investigates options to reduce bromate formation during wastewater ozonation by (i) reducing the bromide concentration of the wastewater, (ii) lowering the ozone dose during wastewater treatment and (iii) adding hydrogen peroxide to limit the lifetime of ozone and quench the intermediates of the bromate formation pathway. Two examples demonstrate that a high share of bromide in wastewater can originate from single point sources (e.g., municipal waste incinerators or landfills). The identification of major point sources requires laborious sampling campaigns, but may facilitate the reduction of the bromide load significantly. To reduce the bromate formation by lowering the ozone dose interferes with the aim to abate micropollutants. Therefore, an additional treatment is necessary to ensure the elimination of micropollutants. Experiments at a pilot-plant illustrate that a combined treatment (ozone/powdered activated carbon) allows to eliminate micropollutants with low bromate yields. Furthermore, the addition of hydrogen peroxide was investigated at bench-scale. The bromate yields could be reduced by ∼50% and 65% for a hydrogen peroxide dose of 5 and 10 mg L , respectively. In conclusion, there are options to reduce the bromate formation during wastewater ozonation, however, they are not simple with sometimes limited efficiency.
[Mh] Termos MeSH primário: Bromatos
Águas Residuais
[Mh] Termos MeSH secundário: Brometos
Ozônio
Poluentes Químicos da Água
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Bromides); 0 (Waste Water); 0 (Water Pollutants, Chemical); 66H7ZZK23N (Ozone)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170505
[Lr] Data última revisão:
170505
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170318
[St] Status:MEDLINE


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[PMID]:28276710
[Au] Autor:Ben Saad H; Kharrat N; Driss D; Gargouri M; Marrakchi R; Jammoussi K; Magné C; Boudawara T; Ellouz Chaabouni S; Zeghal KM; Hakim A; Ben Amara I
[Ad] Endereço:a Faculty of Medicine , Laboratory of Pharmacology, University of Sfax , Tunisia.
[Ti] Título:Effects of vanillin on potassium bromate-induced neurotoxicity in adult mice: impact on behavior, oxidative stress, genes expression, inflammation and fatty acid composition.
[So] Source:Arch Physiol Biochem;123(3):165-174, 2017 Jul.
[Is] ISSN:1744-4160
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:CONTEXT: Vanillin is known to possess important antioxidant activity. OBJECTIVE: The current study was conducted to establish the therapeutic efficiency of vanillin against potassium bromate (KBrO )-induced depression-like behavior and oxidative stress in mice. MATERIAL AND METHODS: Mice were exposed during 15 days either to potassium bromate (KBrO ), KBrO + vanillin or to only vanillin. RESULTS: Our results revealed a significant modification in the fatty acid composition of the KBrO -treated mice. In addition, KBrO induced a significant reduction in enzymatic activities and gene expressions, Na -K and Mg -ATPases, acetylcholinesterase and butylcholinesterase activities. The gene expression of tumor necrosis factor-α, interleukin-1ß, interleukin-6 and COX , significantly increased in the cerebrum of KBrO -treated group. Histopathological observations were consistent with these effects. Co-treatment with vanillin significantly attenuated KBrO -induced oxidative stress and inflammation. CONCLUSION: This work suggests that vanillin mitigates KBrO -induced depression, and that this neuroprotective effect proceeds through anti-oxidant and anti-inflammatory activities.
[Mh] Termos MeSH primário: Antioxidantes/farmacologia
Benzaldeídos/farmacologia
Depressão/prevenção & controle
Regulação da Expressão Gênica/efeitos dos fármacos
Fármacos Neuroprotetores/farmacologia
Síndromes Neurotóxicas/tratamento farmacológico
[Mh] Termos MeSH secundário: Animais
Comportamento Animal/efeitos dos fármacos
Bromatos/toxicidade
Butirilcolinesterase/genética
Butirilcolinesterase/metabolismo
ATPase de Ca(2+) e Mg(2+)/genética
ATPase de Ca(2+) e Mg(2+)/metabolismo
Cérebro/efeitos dos fármacos
Cérebro/metabolismo
Cérebro/fisiopatologia
Ciclo-Oxigenase 2/genética
Ciclo-Oxigenase 2/metabolismo
Depressão/induzido quimicamente
Depressão/genética
Depressão/metabolismo
Ácidos Graxos/metabolismo
Glutationa Peroxidase/genética
Glutationa Peroxidase/metabolismo
Interleucina-1beta/genética
Interleucina-1beta/metabolismo
Interleucina-6/genética
Interleucina-6/metabolismo
Peroxidação de Lipídeos/efeitos dos fármacos
Camundongos
Síndromes Neurotóxicas/genética
Síndromes Neurotóxicas/metabolismo
Síndromes Neurotóxicas/fisiopatologia
Estresse Oxidativo/efeitos dos fármacos
Carbonilação Proteica/efeitos dos fármacos
ATPase Trocadora de Sódio-Potássio/genética
ATPase Trocadora de Sódio-Potássio/metabolismo
Superóxido Dismutase/genética
Superóxido Dismutase/metabolismo
Fator de Necrose Tumoral alfa/genética
Fator de Necrose Tumoral alfa/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antioxidants); 0 (Benzaldehydes); 0 (Bromates); 0 (Fatty Acids); 0 (IL1B protein, mouse); 0 (Interleukin-1beta); 0 (Interleukin-6); 0 (Neuroprotective Agents); 0 (Tumor Necrosis Factor-alpha); 0 (interleukin-6, mouse); 04MB35W6ZA (potassium bromate); CHI530446X (vanillin); EC 1.11.1.9 (Glutathione Peroxidase); EC 1.14.99.- (Ptgs2 protein, mouse); EC 1.14.99.1 (Cyclooxygenase 2); EC 1.15.1.1 (Superoxide Dismutase); EC 3.1.1.8 (Butyrylcholinesterase); EC 3.6.1.- (Ca(2+) Mg(2+)-ATPase); EC 3.6.3.9 (Sodium-Potassium-Exchanging ATPase)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170310
[St] Status:MEDLINE
[do] DOI:10.1080/13813455.2017.1283527


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[PMID]:28118976
[Au] Autor:Wu S; Anumol T; Gandhi J; Snyder SA
[Ad] Endereço:Department of Chemical & Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Harshbarger 108, Tucson, AZ 85721, United States.
[Ti] Título:Analysis of haloacetic acids, bromate, and dalapon in natural waters by ion chromatography-tandem mass spectrometry.
[So] Source:J Chromatogr A;1487:100-107, 2017 Mar 03.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The addition of oxidants for disinfecting water can lead to the formation of potentially carcinogenic compounds referred to as disinfection byproducts (DBPs). Haloacetic acids (HAAs) are one of the most widely detected DBPs in US water utilities and some of them are regulated by the US Environmental Protection Agency (USEPA). The present study developed a method to analyze all the compounds in the USEPA method 557 (nine HAAs, bromate and dalapon) plus four potentially more toxic iodinated HAAs in water by coupling ion chromatography with tandem mass spectrometry (IC-MS/MS). This aqueous direct injection method has significant advantages over traditional GC methods, which require a derivatization and sample extraction that are laborious, time-consuming, and can negatively impact reproducibility. The method developed in this study requires half the time of the current USEPA method 557 on IC-MS/MS while including more compounds and achieving sub-µg/L level method detection limits (MDLs) for all 15 target analytes. The single laboratory lowest concentration minimum reporting level (LCMRL) has also been determined in reagent water, which ranged from 0.011 to 0.62µg/L for the analytes. The mean recoveries of the analytes during matrix spike recovery tests were 77-125% in finished drinking water and 81-112% in surface water. This method was then applied to untreated, chlorinated, and chloraminated groundwater and surface water samples. Bromate and 9 HAAs were detected at different levels in some of these samples.
[Mh] Termos MeSH primário: Monitoramento Ambiental/métodos
Espectrometria de Massas em Tandem
Poluentes Químicos da Água/análise
Água/química
[Mh] Termos MeSH secundário: Acetatos/análise
Bromatos/análise
Limite de Detecção
Propionatos/análise
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetates); 0 (Bromates); 0 (Propionates); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); VO6PY8ZMRW (dalapon)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170427
[Lr] Data última revisão:
170427
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170126
[St] Status:MEDLINE


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[PMID]:28104516
[Au] Autor:Xiao Q; Wang T; Yu S; Yi P; Li L
[Ad] Endereço:State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
[Ti] Título:Influence of UV lamp, sulfur(IV) concentration, and pH on bromate degradation in UV/sulfite systems: Mechanisms and applications.
[So] Source:Water Res;111:288-296, 2017 Mar 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bromate (BrO ) is a possible human carcinogen regulated worldwide at a strict standard of 10 µg/L in drinking water. Removal of BrO by advanced reduction processes (ARPs) has attracted much attention due to its high reduction efficiency and easier combination with ultraviolet (UV) disinfection. In this study, we employed a UV/sulfite process to degrade BrO and studied the effects of UV lamp, sulfur(IV) concentration, and pH on effectiveness of the system in degrading BrO . Low-pressure UV lamps (UV-L) instead of medium-pressure UV lamps (UV-M) were selected because of the high ultraviolet-C (UV-C) efficiency of UV-L. The increased sulfur(IV) concentration is proportionally correlated with enhanced degradation kinetics. BrO reduction was improved by increasing pH when pH is within 6.0-9.0, and principal component analysis demonstrated that pH is the most influential factor over sulfur(IV) concentration and type of UV lamp. Degradation mechanisms at different pH levels were subsequently investigated. Results showed that the reduction reactions are induced by hydrated electron (e ) at pH > 9.0, by H at pH 4.0, and by both e and H at pH 7.0. Effective quantum efficiency for the formation of e and H in the photocatalytic systems was determined to be 0.109 ± 0.001 and 0.034 ± 0.001 mol E , respectively. Furthermore, mass balance calculation of bromine and sulfur at pH 7 showed that bromide, sulfate and possibly dithionate ions were the major products, and a degradation pathway was proposed accordingly. Moreover, UV/sulfite processes could reduce the initial bromate concentration of 0.1 mM by 82% and 95% in the presence and absence of O in tap water respectively, and 99% in the absence of O in deionized water within 20 min at pH 9.0 and 2.0 mM sulfur (IV).
[Mh] Termos MeSH primário: Bromatos
Enxofre
[Mh] Termos MeSH secundário: Concentração de Íons de Hidrogênio
Sulfitos
Raios Ultravioleta
Poluentes Químicos da Água
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Sulfites); 0 (Water Pollutants, Chemical); 70FD1KFU70 (Sulfur)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170505
[Lr] Data última revisão:
170505
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170121
[St] Status:MEDLINE


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[PMID]:28088022
[Au] Autor:Lin KA; Lin JY; Lien HL
[Ad] Endereço:Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address: linky@nchu.edu.tw.
[Ti] Título:Valorization of aluminum scrap via an acid-washing treatment for reductive removal of toxic bromate from water.
[So] Source:Chemosphere;172:325-332, 2017 Apr.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Aluminum scrap (AS) is adopted for the first time as a readily available aluminum source to prepare zero-valent aluminum (ZVAl) for removing bromate from water via a reductive reaction. Since aluminum is easily oxidized to aluminum oxide (Al O ) on exposure to air, an acid-washing pretreatment on AS is developed to remove the layer of Al O . HCl is found as the most effective acid to pretreat AS and the HCl-pretreated or acid-washed AS (AWAS) is able to remove bromate from water and convert it to bromide. Factors, such as temperature, pH, co-existing anions, and particle size, which influence the bromate removal using AWAS are also investigated. The mechanism of bromate removal by AWAS can be attributed to both reduction and adsorption. The elevated temperature also significantly improves bromate removal capacity of AWAS as well as the reaction kinetics. The bromate removal capacity of AWAS is substantially improved under acidic conditions. However, the basic conditions and co-existing anions suppress or interfere with the interaction between bromate and AWAS, leading to much lower removal capacities. The recyclability of AWAS is also evaluated and the acid-washing regeneration is necessary to restore its capacity. However, the mass of AWAS can gradually decrease due to multi-cycle acid-washing regeneration. Through this study, the valorization of AS via acid-washing is demonstrated and optimization of acid-washing parameters is presented. Our findings reveal that the acid-washing is a useful technique to utilize AS as an inexpensive and efficient material for removing bromate from water.
[Mh] Termos MeSH primário: Alumínio/química
Bromatos/química
Bromatos/isolamento & purificação
Poluentes Químicos da Água/química
Poluentes Químicos da Água/isolamento & purificação
Purificação da Água/métodos
Água/química
[Mh] Termos MeSH secundário: Adsorção
Bromatos/toxicidade
Brometos/química
Concentração de Íons de Hidrogênio
Cinética
Oxirredução
Temperatura Ambiente
Poluentes Químicos da Água/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromates); 0 (Bromides); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); CPD4NFA903 (Aluminum)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170115
[St] Status:MEDLINE



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