Base de dados : MEDLINE
Pesquisa : J01.256.675 [Categoria DeCS]
Referências encontradas : 3104 [refinar]
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  1 / 3104 MEDLINE  
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[PMID]:29253824
[Au] Autor:Swain B; Shin D; Joo SY; Ahn NK; Lee CG; Yoon JH
[Ad] Endereço:Institute for Advanced Engineering (IAE), Advanced Materials & Processing Center, Yongin-Si, 449-863, Republic of Korea. Electronic address: swain@iae.re.kr.
[Ti] Título:Synthesis of submicron silver powder from scrap low-temperature co-fired ceramic an e-waste: Understanding the leaching kinetics and wet chemistry.
[So] Source:Chemosphere;194:793-802, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The current study focuses on the understanding of leaching kinetics of metal in the LTCC in general and silver leaching in particular along with wet chemical reduction involving silver nanoparticle synthesis. Followed by metal leaching, the silver was selectively precipitated using HCl as AgCl. The precipitated AgCl was dissolved in ammonium hydroxide and reduced to pure silver metal nanopowder (NPs) using hydrazine as a reductant. Polyvinylpyrrolidone (PVP) used as a stabilizer and Polyethylene glycol (PEG) used as reducing reagent as well as stabilizing reagent to control size and shape of the Ag NPs. An in-depth investigation indicated a first-order kinetics model fits well with high accuracy among all possible models. Activation energy required for the first order reaction was 21.242 kJ mol for Silver. PVP and PEG 1% each together provide better size control over silver nanoparticle synthesis using 0.4 M hydrazine as reductant, which provides relatively regular morphology in comparison to their individual application. The investigation revealed that the waste LTCC (an industrial e-waste) can be recycled through the reported process even in industrial scale. The novelty of reported recycling process is simplicity, versatile and eco-efficiency through which waste LTCC recycling can address various issues like; (i) industrial waste disposal (ii) synthesis of silver nanoparticles from waste LTCC (iii) circulate metal economy within a closed loop cycle in the industrial economies where resources are scarce, altogether.
[Mh] Termos MeSH primário: Cerâmica/química
Nanopartículas Metálicas/química
Reciclagem
Prata/química
[Mh] Termos MeSH secundário: Resíduos Industriais/análise
Cinética
Pós/síntese química
Pós/química
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Industrial Waste); 0 (Powders); 3M4G523W1G (Silver)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171219
[St] Status:MEDLINE


  2 / 3104 MEDLINE  
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[PMID]:29245134
[Au] Autor:Sun D; Hale L; Kar G; Soolanayakanahally R; Adl S
[Ad] Endereço:Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8, Canada. Electronic address: daquansun1010@gmail.com.
[Ti] Título:Phosphorus recovery and reuse by pyrolysis: Applications for agriculture and environment.
[So] Source:Chemosphere;194:682-691, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phosphorus ore extraction for soil fertilization supports the demand of modern agriculture, but extractable resource limitations, due to scarcity, impose a P reuse and recycling research agenda. Here we propose to integrate biochar production (pyrogenic carbon) with municipal and agricultural waste management systems, to recover and reuse phosphorous that would otherwise be lost from the ecological food web. A meta-analysis and available data on total P in biochar indicated that P-enriched feedstocks include animal manure, human excreta, and plant-biomass collected from P-polluted sites. Phosphorus in biochar could participate in P equilibriums in soils and is expected to supply P. The release, sorption and desorption of P by biochar will codetermine the potential of P replenishment by biochar and P loss from biochar-amended soils. Abiotic and biotic factors are expected to affect sorption/desorption of P between biochar and soil aggregates, and P acquisition by plants. Chemical extraction, using acid or alkaline solutions, is considered as a means for P retrieval from high P biochar, especially for biochar with high heavy metal contents. To bridge the gap between academia and practice, this paper proposes future development for phosphorus acclamation by pyrolysis: 1) identification of high-P bio-waste for pyrolysis; 2) retrieval of P by using biochar as soil amendment or by chemical leaching; 3) biochar modification by inorganic nutrients, P solubilizing microorganisms and other organic matter; and 4) compatible pyrolysis equipment fit to the current waste management context, such as households, and waste water treatment plants.
[Mh] Termos MeSH primário: Agricultura
Carvão Vegetal/química
Fósforo/isolamento & purificação
Reciclagem/métodos
Gerenciamento de Resíduos/métodos
[Mh] Termos MeSH secundário: Animais
Carvão Vegetal/síntese química
Poluição Ambiental/análise
Poluição Ambiental/prevenção & controle
Fósforo/química
Solo/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Soil); 0 (biochar); 16291-96-6 (Charcoal); 27YLU75U4W (Phosphorus)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171216
[St] Status:MEDLINE


  3 / 3104 MEDLINE  
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[PMID]:29440612
[Au] Autor:Spear K
[Ad] Endereço:Vet Nurse Online, The Chase, Harlyn Bay, Padstow Pl28 8SB.
[Ti] Título:Reducing plastic waste.
[So] Source:Vet Rec;182(6):173, 2018 02 10.
[Is] ISSN:2042-7670
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Plásticos
Reciclagem
[Mh] Termos MeSH secundário: Animais
Gerenciamento de Resíduos
[Pt] Tipo de publicação:LETTER; COMMENT
[Nm] Nome de substância:
0 (Plastics)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180223
[Lr] Data última revisão:
180223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180215
[St] Status:MEDLINE
[do] DOI:10.1136/vr.k581


  4 / 3104 MEDLINE  
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[PMID]:29121565
[Au] Autor:Shi Y; Gan L; Li X; He S; Sun C; Gao L
[Ad] Endereço:School of Resources and Safety Engineering, Central South University, Changsha, China.
[Ti] Título:Dynamics of metals in backfill of a phosphate mine of guiyang, China using a three-step sequential extraction technique.
[So] Source:Chemosphere;192:354-361, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phosphate rock in Guiyang (Southwest of China) is used for the phosphate production, and hence generating a by-product phosphogypsum (PG). From 2007, part of the PG was used as main raw material for cemented backfill. The main objective of this paper is to investigate the geochemical evolution of metals before and after the PG inclusion into the backfill matrix. A sequential extraction procedure was selected to determine the chemical speciation of metals in phosphate rock, PG, binder and field backfill samples. Dynamics of metals going from phosphate rock and PG to backfill have been evaluated. The results showed that almost all the metals in the PG and binder had been effectively transferred to the backfill. Furthermore, compared to metals taken out along with phosphate rock exploitation, PG-based cemented backfill might bring some metals back but with only little metals in mobile fraction. Additionally, in order to determine the long-term behavior of metals in PG-based cemented backfill, the field samples which were backfilled from 2007 to 2016 were collected and analyzed. The results showed that total amounts of metals in backfill were all within similar range, indicating that the cemented PG backfill could be an effective method to solidify/stabilize metals in PG. Nevertheless, Due to the high water-soluble fractions detected, the concentrations of As, Mn and Zn should be continuously monitored.
[Mh] Termos MeSH primário: Sulfato de Cálcio/química
Monitoramento Ambiental/métodos
Resíduos Industriais/análise
Metais Pesados/análise
Fosfatos/isolamento & purificação
Fósforo/química
[Mh] Termos MeSH secundário: Sulfato de Cálcio/análise
China
Indústrias Extrativas e de Processamento/métodos
Mineração/métodos
Fosfatos/química
Fósforo/análise
Reciclagem/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Industrial Waste); 0 (Metals, Heavy); 0 (Phosphates); 13397-24-5 (phosphogypsum); 27YLU75U4W (Phosphorus); WAT0DDB505 (Calcium Sulfate)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180212
[Lr] Data última revisão:
180212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171110
[St] Status:MEDLINE


  5 / 3104 MEDLINE  
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[PMID]:27773244
[Au] Autor:Thokchom B; Qiu P; Cui M; Park B; Pandit AB; Khim J
[Ad] Endereço:School of Civil, Environmental and Architectural Engineering, Korea University, 5-ga, Anam-dong, Seongbuk-gu, Seoul 136-701, South Korea.
[Ti] Título:Magnetic Pd@Fe O composite nanostructure as recoverable catalyst for sonoelectrohybrid degradation of Ibuprofen.
[So] Source:Ultrason Sonochem;34:262-272, 2017 01.
[Is] ISSN:1873-2828
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In the present research, the degradation of an emerging pharmaceutical micro-pollutant, Ibuprofen (IBP) by using Pd@Fe O and a hybrid sono-electrolytical (US/EC) treatment system has been demonstrated for the first time. The magnetically separable nanocomposite, Pd@Fe O catalyst was synthesized following co-precipitation method to enhance the efficiency of US/EC system. The synthesized catalyst showed a strong reusable property even after applying for five times and in all the five cases, 100% degradation of IBP was maintained. It not only enhanced the IBP degradation rate, but also reduced the energy consumption of the system by ∼35%. Its strong magnetization value of 64.27emug made it easily separable. Hence, a comprehensive knowledge on the application of combined energy based US/EC system and magnetically separable multifunctional catalysts for degradation of intractable pollutants like Ibuprofen was achieved, assuring that US/EC can be an effective option for IBP treatment.
[Mh] Termos MeSH primário: Poluentes Ambientais/química
Ibuprofeno/química
Nanopartículas de Magnetita/química
Paládio/química
Ondas Ultrassônicas
[Mh] Termos MeSH secundário: Adsorção
Catálise
Precipitação Química
Eletroquímica
Concentração de Íons de Hidrogênio
Ferro/química
Reciclagem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Magnetite Nanoparticles); 5TWQ1V240M (Palladium); E1UOL152H7 (Iron); WK2XYI10QM (Ibuprofen)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180131
[Lr] Data última revisão:
180131
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  6 / 3104 MEDLINE  
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[PMID]:27773230
[Au] Autor:Liu C; Sun Y; Wang D; Sun Z; Chen M; Zhou Z; Chen W
[Ad] Endereço:Key Laboratory of Integrated Regulation and Resource Development Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
[Ti] Título:Performance and mechanism of low-frequency ultrasound to regenerate the biological activated carbon.
[So] Source:Ultrason Sonochem;34:142-153, 2017 01.
[Is] ISSN:1873-2828
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Biological activated carbon (BAC) filter has been widely used as an effective water treatment but regenerations of BAC are costly. Ultrasound has been successfully applied for regeneration of activated carbon but has been less frequently applied to the regenerate the BAC. In this study, bench-scale and pilot-scale experiments were conducted to evaluate the regeneration performance and mechanism of BAC with low-frequency ultrasound. Adsorption indices, microbiological parameters, pore structure and removal efficiencies were further investigated. The results showed that low-frequency ultrasound could regenerate the BAC effectively. The regeneration effects were significantly affected by the frequency, sonication intensity, sonication time, and water temperature, but not the usage time of the BAC. The optimized conditions were identified as 40kHz of frequency, 115×10 W/cm of sonication intensity, 25-30°C of water temperature and 5min of sonication time. The iodine value and methylene blue value increased from 480mg/g and 100mg/g to 680mg/g and 133mg/g respectively, the biomass decreased from 310nmolP/gC to 245nmolP/gC, while the biological activity increased from 0.03mg O /hgC to 0.0355mg O /hgC under the optimized condition. After three months of continuous operation, removal efficiencies of regenerated BAC were still high for the removal of organic contaminants, atrazine, and 2-MIB. Analysis of pore structure, BET surface area, and scanning electron microscopy indicated that ultrasound mainly acted on surface and macro-pores of BAC through the high-speed microjets and high-pressure microstreams resulted from the collapse of cavitation bubbles.
[Mh] Termos MeSH primário: Carvão Vegetal/química
Reciclagem/métodos
Sonicação
[Mh] Termos MeSH secundário: Carvão Vegetal/metabolismo
Temperatura Ambiente
Fatores de Tempo
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
059QF0KO0R (Water); 16291-96-6 (Charcoal)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180131
[Lr] Data última revisão:
180131
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  7 / 3104 MEDLINE  
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[PMID]:28743577
[Au] Autor:Zhang ZY; Zhang FS; Yao T
[Ad] Endereço:Department of Solid Waste Treatment and Recycling, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100039, China. Electronic address: zhangzy@rcees.ac.cn.
[Ti] Título:An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps.
[So] Source:Waste Manag;68:490-497, 2017 Oct.
[Is] ISSN:1879-2456
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The present study reports a mechanochemical (MC) process for effective recovery of copper (Cu) and precious metals (i.e. Pd and Ag) from e-waste scraps. Results indicated that the mixture of K S O and NaCl (abbreviated as K S O /NaCl hereafter) was the most effective co-milling reagents in terms of high recovery rate. After co-milling with K S O /NaCl, soluble metallic compounds were produced and consequently benefit the subsequent leaching process. 99.9% of Cu and 95.5% of Pd in the e-waste particles could be recovered in 0.5mol/L diluted HCl in 15min. Ag was concentrated in the leaching residue as AgCl and then recovered in 1mol/L NH solution. XRD and XPS analysis indicated that elemental metals in the raw materials were transformed into their corresponding oxidation state during ball milling process at low temperature, implying that solid-solid phase reactions is the reaction mechanism. Based on the results and thermodynamic parameters of the probable reactions, possible reaction pathways during ball milling were proposed. Suggestion on category of e-waste for ball milling process was put forward according to the experiment results. The designed metal recovery process of this study has the advantages of highly recovery rate and quick leaching speed. Thus, this study offers a promising and environmentally friendly method for recovering valuable metals from e-waste.
[Mh] Termos MeSH primário: Resíduo Eletrônico
Reciclagem
[Mh] Termos MeSH secundário: Cobre
Meio Ambiente
Metais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals); 789U1901C5 (Copper)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180117
[Lr] Data última revisão:
180117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170727
[St] Status:MEDLINE


  8 / 3104 MEDLINE  
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[PMID]:28464556
[Au] Autor:Zhong W; Bobbink FD; Fei Z; Dyson PJ
[Ad] Endereço:College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, 314001, P. R. China.
[Ti] Título:Polyimidazolium Salts: Robust Catalysts for the Cycloaddition of Carbon Dioxide into Carbonates in Solvent-Free Conditions.
[So] Source:ChemSusChem;10(13):2728-2735, 2017 07 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:There is a growing interest in sustainable heterogeneous catalysts based on organic polymers. Here, we describe a series of polyimidazolium salt catalysts, prepared from the direct reaction of arene-bridged bis- and tris-alkyl halides with trimethylsilylimidazole. The polyimidazolium salts were characterized by spectroscopic and analytical techniques and it was found that their morphology and porosity could be controlled by adjusting the steric parameters of the spacer in the alkyl-halide starting materials. Moreover, the polymers are excellent heterogeneous organocatalysts for the cycloaddition of CO to epoxides to afford cyclic carbonates at atmospheric pressure under solvent-free conditions. The polymer catalysts exhibit long-term stability and may be recycled and reused at least 10 times.
[Mh] Termos MeSH primário: Dióxido de Carbono/química
Carbonatos/química
Carbonatos/síntese química
Reação de Cicloadição
Imidazóis/química
[Mh] Termos MeSH secundário: Pressão Atmosférica
Catálise
Reciclagem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Carbonates); 0 (Imidazoles); 142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:180118
[Lr] Data última revisão:
180118
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700570


  9 / 3104 MEDLINE  
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[PMID]:29289289
[Au] Autor:Zhang M; Feng G; Yin W; Xie B; Ren M; Xu Z; Zhang S; Cai Z
[Ad] Endereço:Partner State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong 999077, China; South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China.
[Ti] Título:Airborne PCDD/Fs in two e-waste recycling regions after stricter environmental regulations.
[So] Source:J Environ Sci (China);62:3-10, 2017 Dec.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Since the 2010s, the authorities of Guangdong province and local governments have enhanced law enforcement and environmental regulations to abolish open burning, acid washing, and other uncontrolled e-waste recycling activities. In this study, ambient air and indoor dust near different kinds of e-waste recycling processes were collected in Guiyu and Qingyuan to investigate the pollution status of particles and polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) after stricter environmental regulations. PM and PCDD/Fs both showed significantly reduced levels in the two regions compared with the documented data. The congener distribution and principal component analysis results also confirmed the significant differences between the current PCDD/Fs pollution characterizations and the historical ones. The estimated total intake doses via air inhalation and dust ingestion of children in the recycling region of Guiyu ranged from 10 to 32pgTEQ/(kg•day), which far exceeded the tolerable daily intake (TDI) limit (1-4pgTEQ/(kg•day). Although the measurements showed a significant reduction of the release of PCDD/Fs, the pollution status was still considered severe in Guiyu town after stricter regulations were implemented.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Poluição do Ar/estatística & dados numéricos
Dibenzofuranos Policlorados/análise
Resíduo Eletrônico
Monitoramento Ambiental
Dibenzodioxinas Policloradas/análise
[Mh] Termos MeSH secundário: Poluição do Ar/legislação & jurisprudência
Política Ambiental
Reciclagem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Dibenzofurans, Polychlorinated); 0 (Polychlorinated Dibenzodioxins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180103
[Lr] Data última revisão:
180103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180101
[St] Status:MEDLINE


  10 / 3104 MEDLINE  
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[PMID]:28470498
[Au] Autor:Cruz NC; Rodrigues SM; Carvalho L; Duarte AC; Pereira E; Römkens PFAM; Tarelho LAC
[Ad] Endereço:CESAM & Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.
[Ti] Título:Ashes from fluidized bed combustion of residual forest biomass: recycling to soil as a viable management option.
[So] Source:Environ Sci Pollut Res Int;24(17):14770-14781, 2017 Jun.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Although bottom ash (BA) [or mixtures of bottom and fly ash (FA)] from clean biomass fuels is currently used as liming agent, additive for compost, and fertilizer on agricultural and forest soils in certain European countries, in several other countries most of the ashes are currently disposed in landfills. This is due to both a lack of a proper classification of the materials and of regulatory barriers.Chemical characterization including analysis of an array of potentially toxic elements (PTEs) proved that over 100,000 tons of BA currently landfilled every year in Portugal actually complied with legal limits for PTEs for soil fertilizers applied in other countries. Pot experiments were conducted, testing three dosages of BA and FA (1, 2.5, and 5%, in weight) in three mining soils with different properties. Additions of ash materials to soils led to an increase in the pore water pH relative to control pots (0% of ash added) and had a clear impact on DOC and on the solubilization of both macro- and micronutrients (notably Cu).The results from the case study using BA and FA from a Portuguese biomass thermal power plant demonstrate that it is imperative to further develop a regulatory framework to alleviate technological and environmental barriers for biomass ash utilization as raw material for fertilizers and/or soil liming agent, in accordance with the goals of the circular economy. A more harmonized view on how to assess the merits and risks of the re-use of these materials is also needed.
[Mh] Termos MeSH primário: Cinza de Carvão
Florestas
Reciclagem
[Mh] Termos MeSH secundário: Biomassa
Europa (Continente)
Portugal
Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coal Ash); 0 (Soil)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-017-9013-6



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