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[PMID]:29478651
[Au] Autor:Hu X; Yue Y; Peng X
[Ad] Endereço:National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: xyhu@rcees.ac.cn.
[Ti] Título:Release kinetics of vanadium from vanadium titano-magnetite: The effects of pH, dissolved oxygen, temperature and foreign ions.
[So] Source:J Environ Sci (China);64:298-305, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:As part of a broader study of the environmental geochemistry behavior of vanadium (V), the release kinetics of V from the dissolution of natural vanadium titano-magnetite under environmentally relevant conditions was investigated. In both the acidic and basic domains, the V release rate was found to be proportional to fractional powers of hydrogen ion and dissolved oxygen activities. The dependence of the rate on dissolved oxygen can also be described in terms of the Langmuir adsorption model. The empirical rate equation is given by: r [Formula: see text] where, α=0.099-0.265, k'=3.2×10 -1.7×10 , K=2.7×10 -3.9×10 mol/L in acid solution (pH4.1), and α=-0.494-(-0.527), k'=2.0×10 -2.5×10 , and K=4.1×10 -6.5×10 mol/L in basic solution (pH8.8) at 20°C. Based on the effect of temperature on the release rate of V, the activation energies of minerals at pH8.8 were determined to be 148-235kJ/mol, suggesting that the dissolution of vanadium titano-magnetite is a surface-controlled process. The presence of Na , Ca , Mg , K , NO , Cl , SO and CO was found to accelerate the V release rates. This study improves the understanding of both the V pollution risk in some mine areas and the fate of V in the environment.
[Mh] Termos MeSH primário: Óxido Ferroso-Férrico/química
Modelos Químicos
Vanádio/química
[Mh] Termos MeSH secundário: Adsorção
Concentração de Íons de Hidrogênio
Cinética
Oxigênio
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
00J9J9XKDE (Vanadium); S88TT14065 (Oxygen); XM0M87F357 (Ferrosoferric Oxide)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


  2 / 3358 MEDLINE  
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[PMID]:28877212
[Au] Autor:Yao H; Zhao X; Fan R; Sattar H; Zhao J; Zhao W; Zhang Z; Li Y; Xu S
[Ad] Endereço:Department of Veterinary Medicine, Northeast Agricultural University, Harbin, P. R. China.
[Ti] Título:Selenium deficiency-induced alterations in ion profiles in chicken muscle.
[So] Source:PLoS One;12(9):e0184186, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Ion homeostasis plays important roles in development of metabolic diseases. In the present study, we examined the contents and distributions of 25 ions in chicken muscles following treatment with selenium (Se) deficiency for 25 days. The results revealed that in chicken muscles, the top ranked microelements were silicon (Si), iron (Fe), zinc (Zn), aluminum (Al), copper (Cu) and boron (B), showing low contents that varied from 292.89 ppb to 100.27 ppm. After Se deficiency treatment, essential microelements [Cu, chromium (Cr), vanadium (V) and manganese (Mn)], and toxic microelements [cadmium (Cd) and mercury (Hg)] became more concentrated (P < 0.05). Elements distribution images showed generalized accumulation of barium (Ba), cobalt (Co), Cu, Fe and V, while Cr, Mn, and Zn showed pin point accumulations in muscle sections. Thus, the ion profiles were generally influenced by Se deficiency, which suggested a possible role of Se deficiency in muscle dysfunctions caused by these altered ion profiles.
[Mh] Termos MeSH primário: Músculo Esquelético/metabolismo
Selênio/deficiência
Oligoelementos/metabolismo
[Mh] Termos MeSH secundário: Alumínio/análise
Alumínio/metabolismo
Animais
Boro/análise
Boro/metabolismo
Galinhas
Cromo/análise
Cromo/metabolismo
Cobre/análise
Cobre/metabolismo
Íons/análise
Íons/metabolismo
Ferro/análise
Ferro/metabolismo
Masculino
Manganês/análise
Manganês/metabolismo
Músculo Esquelético/química
Silício/análise
Silício/metabolismo
Oligoelementos/análise
Vanádio/análise
Vanádio/metabolismo
Zinco/análise
Zinco/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Trace Elements); 00J9J9XKDE (Vanadium); 0R0008Q3JB (Chromium); 42Z2K6ZL8P (Manganese); 789U1901C5 (Copper); CPD4NFA903 (Aluminum); E1UOL152H7 (Iron); H6241UJ22B (Selenium); J41CSQ7QDS (Zinc); N9E3X5056Q (Boron); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170907
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184186


  3 / 3358 MEDLINE  
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[PMID]:28838766
[Au] Autor:Tonelli M; Wiebe N; Bello A; Field CJ; Gill JS; Hemmelgarn BR; Holmes DT; Jindal K; Klarenbach SW; Manns BJ; Thadhani R; Kinniburgh D; Alberta Kidney Disease Network
[Ad] Endereço:Department of Medicine, University of Calgary, Calgary, Canada. Electronic address: tonelli.admin@ucalgary.ca.
[Ti] Título:Concentrations of Trace Elements in Hemodialysis Patients: A Prospective Cohort Study.
[So] Source:Am J Kidney Dis;70(5):696-704, 2017 Nov.
[Is] ISSN:1523-6838
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Low concentrations and excessive concentrations of trace elements have been commonly reported in hemodialysis patients, but available studies have several important limitations. STUDY DESIGN: Random sample of patients drawn from a prospective cohort. SETTING & PARTICIPANTS: 198 incident hemodialysis patients treated in 3 Canadian centers. MEASUREMENTS: We used mass spectrometry to measure plasma concentrations of the 25 elements at baseline, 6 months, 1 year, and 2 years following enrollment in the cohort. We focused on low concentrations of zinc, selenium, and manganese and excessive concentrations of lead, arsenic, and mercury; low and excessive concentrations of the other 19 trace elements were treated as exploratory analyses. Low and excessive concentrations were based on the 5th and 95th percentile plasma concentrations from healthy reference populations. RESULTS: At all 4 occasions, low zinc, selenium, and manganese concentrations were uncommon in study participants (≤5.1%, ≤1.8%, and ≤0.9% for zinc, selenium, and manganese, respectively) and a substantial proportion of participants had concentrations that exceeded the 95th percentile (≥65.2%, ≥74.2%, and ≥19.7%, respectively). Almost all participants had plasma lead concentrations above the 95th percentile at all time points. The proportion of participants with plasma arsenic concentrations exceeding the 95th percentile was relatively constant over time (9.1%-9.8%); the proportion with plasma mercury concentrations that exceeded the 95th percentile varied between 15.2% and 29.3%. Low arsenic, platinum, tungsten, and beryllium concentrations were common (>50%), as were excessive cobalt, manganese, zinc, vanadium, cadmium, selenium, barium, antimony, nickel, molybdenum, lead, and chromium concentrations. CONCLUSIONS: There was no evidence that low zinc, selenium, or manganese concentrations exist in most contemporary Canadian hemodialysis patients. Some patients have excessive plasma arsenic and mercury concentrations, and excessive lead concentrations were common. These findings require further investigation.
[Mh] Termos MeSH primário: Falência Renal Crônica/sangue
Oligoelementos/sangue
[Mh] Termos MeSH secundário: Adolescente
Adulto
Idoso
Antimônio/sangue
Arsênico/sangue
Bário/sangue
Berílio/sangue
Cádmio/sangue
Cromo/sangue
Cobalto/sangue
Estudos de Coortes
Feminino
Seres Humanos
Falência Renal Crônica/terapia
Chumbo/sangue
Masculino
Manganês/sangue
Espectrometria de Massas
Mercúrio/sangue
Meia-Idade
Molibdênio/sangue
Níquel/sangue
Platina/sangue
Estudos Prospectivos
Diálise Renal
Selênio/sangue
Tungstênio/sangue
Vanádio/sangue
Adulto Jovem
Zinco/sangue
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Trace Elements); 00BH33GNGH (Cadmium); 00J9J9XKDE (Vanadium); 0R0008Q3JB (Chromium); 24GP945V5T (Barium); 2P299V784P (Lead); 3G0H8C9362 (Cobalt); 42Z2K6ZL8P (Manganese); 49DFR088MY (Platinum); 7OV03QG267 (Nickel); 81AH48963U (Molybdenum); 9IT35J3UV3 (Antimony); FXS1BY2PGL (Mercury); H6241UJ22B (Selenium); J41CSQ7QDS (Zinc); N712M78A8G (Arsenic); OW5102UV6N (Beryllium); V9306CXO6G (Tungsten)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171030
[Lr] Data última revisão:
171030
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170826
[St] Status:MEDLINE


  4 / 3358 MEDLINE  
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[PMID]:28597089
[Au] Autor:Machado PA; Morais JOF; Carvalho GSG; Lima WP; Macedo GC; Britta EA; Nakamura CV; da Silva AD; Cuin A; Coimbra ES
[Ad] Endereço:Departamento de Parasitologia, Microbiologia e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, 36036-900, Brazil.
[Ti] Título:VOSalophen: a vanadium complex with a stilbene derivative-induction of apoptosis, autophagy, and efficiency in experimental cutaneous leishmaniasis.
[So] Source:J Biol Inorg Chem;22(6):929-939, 2017 Aug.
[Is] ISSN:1432-1327
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:In our previous work, we demonstrated the promising in vitro effect of VOSalophen, a vanadium complex with a stilbene derivative, against Leishmania amazonensis. Its antileishmanial activity has been associated with oxidative stress in L. amazonensis promastigotes and L. amazonensis-infected macrophages. In the present study, the mechanism involved in the death of parasites after treatment with VOSalophen, as well as in vivo effect in the murine model cutaneous leishmaniasis, has been investigated. Promastigotes of L. amazonensis treated with VOSalophen presented apoptotic cells features, such as cell volume decrease, phosphatidylserine externalization, and DNA fragmentation. An increase in autophagic vacuoles formation in treated promastigotes was also observed, showing that autophagy also may be involved in the death of these parasites. In intracellular amastigotes, DNA fragmentation was observed after treatment with VOSalophen, but this effect was not observed in host cells, highlighting the selective effect of this vanadium complex. In addition, VOSalophen showed activity in the murine model of cutaneous leishmaniasis, without hepatic and renal damages. The outcome described here points out that VOSalophen had promising antileishmanial properties and these data also contribute to the understanding of the mechanisms involved in the death of protozoa induced by metal complexes.
[Mh] Termos MeSH primário: Apoptose/efeitos dos fármacos
Autofagia/efeitos dos fármacos
Leishmaniose Cutânea/tratamento farmacológico
Leishmaniose Cutânea/patologia
Compostos Organometálicos/química
Compostos Organometálicos/farmacologia
Estilbenos/química
Vanádio/química
[Mh] Termos MeSH secundário: Animais
Fragmentação do DNA/efeitos dos fármacos
Modelos Animais de Doenças
Feminino
Leishmaniose Cutânea/genética
Camundongos
Camundongos Endogâmicos BALB C
Compostos Organometálicos/uso terapêutico
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Organometallic Compounds); 0 (Stilbenes); 00J9J9XKDE (Vanadium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170610
[St] Status:MEDLINE
[do] DOI:10.1007/s00775-017-1471-2


  5 / 3358 MEDLINE  
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[PMID]:28582612
[Au] Autor:Drouza C; Dieronitou A; Hadjiadamou I; Stylianou M
[Ad] Endereço:Department of Agricultural Sciences, Biotechnology, and Food Science, Cyprus University of Technology , Limassol 3036, Cyprus.
[Ti] Título:Investigation of Phenols Activity in Early Stage Oxidation of Edible Oils by Electron Paramagnetic Resonance and F NMR Spectroscopies Using Novel Lipid Vanadium Complexes As Radical Initiators.
[So] Source:J Agric Food Chem;65(24):4942-4951, 2017 Jun 21.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A novel dynamic method for the investigation of the phenols activity in early stage oxidation of edible oils based on the formation of α-tocopheryl radicals initiated by oil-soluble vanadium complexes is developed. Two new vanadium complexes in oxidation states V and IV were synthesized by reacting 2,2'-((2-hydroxyoctadecyl)azanediyl)bis(ethan-1-ol) (C18DEA) with [VO(acac) ] and 1-(bis(pyridin-2-ylmethyl)amino)octadecan-2-ol (C18DPA) with VOCl . Addition of a solution of either complex in edible oils resulted in the formation of α-tocopheryl radical, which was monitored by electron paramagnetic resonance (EPR) spectroscopy. The intensity of the α-tocopheryl signal in the EPR spectra was measured versus time. It was found that the profile of the intensity of the α-tocopheryl signal versus time depends on the type of oil, the phenolic content, and the storage time of the oil. The time interval until the occurrence of maximum peak intensity be reached (t ), the height of the maximum intensity, and the rate of the quenching of the α-tocopheryl radical were used for the investigation of the mechanism of the edible oils oxidation. F NMR of the F labeled phenolic compounds (through trifluoroacetate esters) and radical trap experiments showed that the vanadium complexes in edible oil activate the one electron reduction of dioxygen to superperoxide radical. Superperoxide reacts with the lipids to form alkoperoxyl and alkoxyl lipid radicals, and all these radicals react with the phenols contained in oils.
[Mh] Termos MeSH primário: Radicais Livres/química
Lipídeos/química
Fenóis/química
Óleos Vegetais/química
Vanádio/química
[Mh] Termos MeSH secundário: Espectroscopia de Ressonância de Spin Eletrônica
Oxirredução
alfa-Tocoferol/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Free Radicals); 0 (Lipids); 0 (Phenols); 0 (Plant Oils); 00J9J9XKDE (Vanadium); H4N855PNZ1 (alpha-Tocopherol)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170703
[Lr] Data última revisão:
170703
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170606
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b01144


  6 / 3358 MEDLINE  
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[PMID]:28571853
[Au] Autor:Zhu L; Zhong Z; Yang H; Wang C
[Ad] Endereço:Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
[Ti] Título:Effect of MoO on vanadium based catalysts for the selective catalytic reduction of NO with NH at low temperature.
[So] Source:J Environ Sci (China);56:169-179, 2017 Jun.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The selective catalytic reduction (SCR) activities of the MoO doped V/WTi catalysts prepared by the incipient wetness impregnation method at low temperature were investigated. The results showed that the addition of MoO could enhance the NO conversion at low temperature and the best SCR activity was obtained when the dosage of MoO reached 5wt.%. The NH -TPD and DRIFTS experiments indicated that the addition of MoO changed the type and number of acid sites on the surface of catalysts and reaction activities of acid sites were altered at the same time. The redox capacity and amount of active oxygen species got improved for V3Mo5/WTi catalyst, which could be confirmed by the H -TPR and transient response experiments. Water vapor inhibited the NO conversion at low temperature. Deposition of ammonium sulfate or bisulfate might be main reason for the loss of catalytic activity in the presence of SO at low temperature. Choosing the suitable NH /NO ratio and elevation of reaction temperature both could weaken the influence of SO on the SCR activity of the V3Mo5/WTi catalyst. Thermal treatment of the deactivated catalyst at 350°C could get the low temperature activity recovered. The decrease of GHSV improved the deNO efficiency at low temperature and we speculated that the rational technological process and operation parameters could contribute to the application of this kind of catalysts in real industrial environment.
[Mh] Termos MeSH primário: Amônia/química
Modelos Químicos
Molibdênio/química
Óxido Nítrico/química
Óxidos/química
Vanádio/química
[Mh] Termos MeSH secundário: Catálise
Temperatura Baixa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Oxides); 00J9J9XKDE (Vanadium); 22FQ3F03YS (molybdenum trioxide); 31C4KY9ESH (Nitric Oxide); 7664-41-7 (Ammonia); 81AH48963U (Molybdenum)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170630
[Lr] Data última revisão:
170630
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170603
[St] Status:MEDLINE


  7 / 3358 MEDLINE  
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[PMID]:28544623
[Au] Autor:Nibel O; Rojek T; Schmidt TJ; Gubler L
[Ad] Endereço:Electrochemistry Laboratory, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.
[Ti] Título:Amphoteric Ion-Exchange Membranes with Significantly Improved Vanadium Barrier Properties for All-Vanadium Redox Flow Batteries.
[So] Source:ChemSusChem;10(13):2767-2777, 2017 Jul 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:All-vanadium redox flow batteries (VRBs) have attracted considerable interest as promising energy-storage devices that can allow the efficient utilization of renewable energy sources. The membrane, which separates the porous electrodes in a redox flow cell, is one of the key components in VRBs. High rates of crossover of vanadium ions and water through the membrane impair the efficiency and capacity of a VRB. Thus, membranes with low permeation rate of vanadium species and water are required, also characterized by low resistance and stability in the VRB environment. Here, we present a new design concept for amphoteric ion-exchange membranes, based on radiation-induced grafting of vinylpyridine into an ethylene tetrafluoroethylene base film and a two-step functionalization to introduce cationic and anionic exchange sites, respectively. During long-term cycling, redox flow cells containing these membranes showed higher efficiency, less pronounced electrolyte imbalance, and significantly reduced capacity decay compared to the cells with the benchmark material Nafion 117.
[Mh] Termos MeSH primário: Fontes de Energia Elétrica
Membranas Artificiais
Vanádio/química
[Mh] Termos MeSH secundário: Eletroquímica
Troca Iônica
Oxirredução
Óxidos/química
Oximas/química
Permeabilidade
Ácidos Sulfônicos/química
Compostos de Vanádio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Membranes, Artificial); 0 (Oxides); 0 (Oximes); 0 (Sulfonic Acids); 0 (Vanadium Compounds); 0 (amidoxime); 0 (vanadium dioxide); 00J9J9XKDE (Vanadium)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170808
[Lr] Data última revisão:
170808
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170526
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700610


  8 / 3358 MEDLINE  
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[PMID]:28527917
[Au] Autor:Cao X; Diao M; Zhang B; Liu H; Wang S; Yang M
[Ad] Endereço:School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China.
[Ti] Título:Spatial distribution of vanadium and microbial community responses in surface soil of Panzhihua mining and smelting area, China.
[So] Source:Chemosphere;183:9-17, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Spatial distribution of vanadium in surface soils from different processing stages of vanadium-bearing titanomagnetite in Panzhihua mining and smelting area (China) as well as responses of microbial communities including bacteria and fungi to vanadium were investigated by fieldwork and laboratory incubation experiment. The vanadium contents in this region ranged from 149.3 to 4793.6 mg kg , exceeding the soil background value of vanadium in China (82 mg kg ) largely. High-throughput DNA sequencing results showed bacterial communities from different manufacturing locations were quite diverse, but Bacteroidetes and Proteobacteria were abundant in all samples. The contents of organic matter, available P, available S and vanadium had great influences on the structures of bacterial communities in soils. Bacterial communities converged to similar structure after long-term (240 d) cultivation with vanadium containing medium, dominating by bacteria which can tolerate or reduce toxicities of heavy metals. Fungal diversities decreased after cultivation, but Ascomycota and Ciliophora were still the most abundant phyla as in the original soil samples. Results in this study emphasize the urgency of investigating vanadium contaminations in soils and provide valuable information on how vanadium contamination influences bacterial and fungal communities.
[Mh] Termos MeSH primário: Consórcios Microbianos/efeitos dos fármacos
Mineração
Microbiologia do Solo
Poluentes do Solo/análise
Solo/química
Vanádio/análise
[Mh] Termos MeSH secundário: Ascomicetos/efeitos dos fármacos
Ascomicetos/isolamento & purificação
Bacteroidetes/efeitos dos fármacos
Bacteroidetes/isolamento & purificação
China
Cilióforos/efeitos dos fármacos
Cilióforos/isolamento & purificação
Sequenciamento de Nucleotídeos em Larga Escala
Consórcios Microbianos/genética
Proteobactérias/efeitos dos fármacos
Proteobactérias/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 0 (Soil Pollutants); 00J9J9XKDE (Vanadium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170522
[St] Status:MEDLINE


  9 / 3358 MEDLINE  
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[PMID]:28412486
[Au] Autor:Jiang J; Yang M; Gao Y; Wang J; Li D; Li T
[Ad] Endereço:School of Environment, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Tsinghua University, Beijing, 100084, China; Collaborative Innovation Center for Regional Environmental Quality, Tsinghua
[Ti] Título:Removal of toxic metals from vanadium-contaminated soils using a washing method: Reagent selection and parameter optimization.
[So] Source:Chemosphere;180:295-301, 2017 Aug.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Vanadium (V) contamination in soils is an increasing worldwide concern facing human health and environmental conservation. The fractionation of a metal influences its mobility and biological toxicity. We analyzed the fractionations of V and several other metals using the BCR three-step sequential extraction procedure. Among methods for removing metal contamination, soil washing is an effective permanent treatment. We conducted experiments to select the proper reagents and to optimize extraction conditions. Citric acid, tartaric acid, oxalic acid, and Na EDTA all exhibited high removal rates of the extractable state of V. With a liquid-to-solid ratio of 10, washing with 0.4 mol/L citric acid, 0.4 mol/L tartaric acid, 0.4 mol/L oxalic acid, and 0.12 mol/L Na EDTA led to removal rates of 91%, 88%, 88%, and 61%, respectively. The effect of multiple washing on removal rate was also explored. According to the changes observed in metal fractionations, differences in removal rates among reagents is likely associated with their pK value, pH in solution, and chemical structure. We concluded that treating with appropriate washing reagents under optimal conditions can greatly enhance the remediation of vanadium-contaminated soils.
[Mh] Termos MeSH primário: Recuperação e Remediação Ambiental/métodos
Poluentes do Solo/análise
Vanádio/análise
[Mh] Termos MeSH secundário: Fracionamento Químico
Ácido Cítrico
Poluição Ambiental
Seres Humanos
Indicadores e Reagentes
Oxalatos/química
Solo/química
Tartaratos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Indicators and Reagents); 0 (Oxalates); 0 (Soil); 0 (Soil Pollutants); 0 (Tartrates); 00J9J9XKDE (Vanadium); 2968PHW8QP (Citric Acid); W4888I119H (tartaric acid)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170417
[St] Status:MEDLINE


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[PMID]:28411515
[Au] Autor:Xiao XY; Wang MW; Zhu HW; Guo ZH; Han XQ; Zeng P
[Ad] Endereço:School of Metallurgy and Environment, Central South University, Changsha 410083, China.
[Ti] Título:Response of soil microbial activities and microbial community structure to vanadium stress.
[So] Source:Ecotoxicol Environ Saf;142:200-206, 2017 Aug.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:High levels of vanadium (V) have long-term, hazardous impacts on soil ecosystems and biological processes. In the present study, the effects of V on soil enzymatic activities, basal respiration (BR), microbial biomass carbon (MBC), and the microbial community structure were investigated through 12-week greenhouse incubation experiments. The results showed that V content affected soil dehydrogenase activity (DHA), BR, and MBC, while urease activity (UA) was less sensitive to V stress. The average median effective concentration (EC ) thresholds of V were predicted using a log-logistic dose-response model, and they were 362mgV/kg soil for BR and 417mgV/kg soil for DHA. BR and DHA were more sensitive to V addition and could be used as biological indicators for soil V pollution. According to a polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analysis, the structural diversity of the microbial community decreased for soil V contents ranged between 254 and 1104mg/kg after 1 week of incubation. As the incubation time increased, the diversity of the soil microbial community structure increased for V contents ranged between 354 and 1104mg/kg, indicating that some new V-tolerant bacterial species might have replicated under these conditions.
[Mh] Termos MeSH primário: Consórcios Microbianos/efeitos dos fármacos
Microbiologia do Solo
Poluentes do Solo/toxicidade
Solo/química
Vanádio/toxicidade
[Mh] Termos MeSH secundário: Biomassa
Análise por Conglomerados
Eletroforese em Gel de Gradiente Desnaturante
Ecossistema
Consórcios Microbianos/genética
Consórcios Microbianos/fisiologia
Modelos Teóricos
RNA Ribossômico 16S/genética
Poluentes do Solo/análise
Vanádio/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S); 0 (Soil); 0 (Soil Pollutants); 00J9J9XKDE (Vanadium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170416
[St] Status:MEDLINE



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