Base de dados : MEDLINE
Pesquisa : D01.075.025 [Categoria DeCS]
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[PMID]:29175405
[Au] Autor:Yang F; Xie S; Liu J; Wei C; Zhang H; Chen T; Zhang J
[Ad] Endereço:Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Key Laboratory of Land Surface Pattern and Simulation, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
[Ti] Título:Arsenic concentrations and speciation in wild birds from an abandoned realgar mine in China.
[So] Source:Chemosphere;193:777-784, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Birds are at a higher level in the food chain; however, the potential bioaccumulation and biotransformation of arsenic (As) in birds in As mines has rarely been studied. In this study, four passerine bird species (tree sparrow [Passer montanus], light-vented bulbul [Pycnonotus sinensis], Garrulax canorus [Leucodioptron canorus], and magpie [Pica pica]) were collected from an abandoned As mine in China. The highest recorded As concentrations were 4.95 mg/kg and 51.65 mg/kg in muscles and feathers, respectively. Detection using high-performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC-ICP-MS) revealed six As species, including arsenite (As(III)), arsenate (As(V)), dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), arsenobetaine (AsB) and arsenocholine (AsC), with the former three species as the dominant (>92%) and the latter three as the minor As species (<6.17%). Further analysis of the selected bird samples using the X-ray absorption near edge structure (XANES) technique revealed the existence of As(III)-tris-glutathione (As(III)-GSH), which can be regarded as equivalent to the non-extractable and unidentified As form in the HPLC-ICP-MS data. Both methods revealed similar patterns of As species in the birds from the As mine, with muscles containing mainly inorganic As and DMA and feathers containing mainly inorganic As. The results of this study contribute to the knowledge regarding As accumulation and speciation in terrestrial organisms.
[Mh] Termos MeSH primário: Arsênico/análise
Arsenicais/análise
Aves
Mineração
[Mh] Termos MeSH secundário: Animais
Arseniatos
Arsênico/química
Arsenitos
Ácido Cacodílico/análise
China
Cromatografia Líquida de Alta Pressão/métodos
Plumas/química
Espectrometria de Massas/métodos
Músculo Esquelético/química
Passeriformes
Sulfetos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Arsenicals); 0 (Arsenites); 0 (Sulfides); 39895-81-3 (arsenocholine); 56320-22-0 (arsenic disulfide); AJ2HL7EU8K (Cacodylic Acid); J37VJ5709S (monomethylarsonic acid); N5509X556J (arsenite); N712M78A8G (Arsenic); N7CIZ75ZPN (arsenic acid); UWC1LS4V3I (arsenobetaine)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


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[PMID]:28837873
[Au] Autor:Kim J; Lee C; Lee SM; Lalhmunsiama; Jung J
[Ad] Endereço:Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea.
[Ti] Título:Chemical and toxicological assessment of arsenic sorption onto Fe-sericite composite powder and beads.
[So] Source:Ecotoxicol Environ Saf;147:80-85, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Batch sorption and leaching of arsenic (1-30mgL ) on Fe-sericite composite powder and beads were investigated in this study. Fe-sericite composite powder was made from natural sericite modified with iron, and alginate was used to transform the powder into beads. The maximum sorption capacities of the Fe-sericite composite powder (15.04 and 13.21mgg for As(III) and As(V), respectively) were higher than those of the corresponding beads (9.02 and 7.11mgg for As(III) and As(V), respectively) owing to the higher specific surface area of the powder. In addition, the leaching amounts of As(III) from Fe-sericite composite beads (≤ 15.03%) were higher than those of the corresponding powder (≤ 5.71%). However, acute toxicity of As(III)-sorbed Fe-sericite composite beads toward Daphnia magna was not significantly different from that of the corresponding powder (p > 0.05). Considering higher uptake of the powder particles by the daphnids, Fe-sericite composite beads seem to be a more appropriate and safer sorbent for arsenic removal in practical application. Based on Fe content, Fe-sericite composite beads had similar or higher maximum sorption capacities (71.19 and 56.11mgg Fe for As(III) and As(V), respectively) than those of previously reported sorbents.
[Mh] Termos MeSH primário: Arseniatos/análise
Arsenitos/análise
Ferro/química
Dióxido de Silício/química
Poluentes Químicos da Água/análise
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Adsorção
Alginatos/química
Animais
Arseniatos/toxicidade
Arsenitos/toxicidade
Daphnia/efeitos dos fármacos
Ácido Glucurônico/química
Ácidos Hexurônicos/química
Modelos Teóricos
Tamanho da Partícula
Pós
Propriedades de Superfície
Testes de Toxicidade Aguda
Poluentes Químicos da Água/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alginates); 0 (Arsenates); 0 (Arsenites); 0 (Hexuronic Acids); 0 (Powders); 0 (Water Pollutants, Chemical); 0 (sericite); 7631-86-9 (Silicon Dioxide); 8A5D83Q4RW (Glucuronic Acid); 8C3Z4148WZ (alginic acid); E1UOL152H7 (Iron)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170825
[St] Status:MEDLINE


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[PMID]:28968924
[Au] Autor:Zvobgo G; LwalabaWaLwalaba J; Sagonda T; Mutemachani Mapodzeke J; Muhammad N; Haider Shamsi I; Zhang G
[Ad] Endereço:Department of Agronomy, College of Agriculture and Biotechnology, Key Laboratory of Crop Germplasm Resource, Zhejiang University, Hangzhou 310058, PR China.
[Ti] Título:Phosphate alleviates arsenate toxicity by altering expression of phosphate transporters in the tolerant barley genotypes.
[So] Source:Ecotoxicol Environ Saf;147:832-839, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The contribution of the phosphate transporters (PHTs) in uptake of arsenate (As ) and phosphate (P) is a widely recognized mechanism. Here we investigated how P regulates the uptake of As and the subsequent effects on growth and relative expression of PHTs. The study was conducted on 3 barley genotypes differing in As tolerance (ZDB160, As-tolerant; ZDB115, moderately tolerant; ZDB475, As-sensitive) using a hydroponic experiment. There were 3 As (0, 10 and 100µM) and 3P (0, 50 and 500µM) levels. The results showed that the negative effect of As stress on plant growth, photosynthesis and cell ultra-structure is As dose and barley genotype dependent, confirming the distinctly genotypic difference in As tolerance. As uptake and accumulation in plant tissues are closely associated with inhibited extent of growth and photosynthesis, with the tolerant genotype ZDB160 having lower As content than other two genotypes. The toxic effect caused by As stress could be alleviated by P addition, mainly due to reduced As uptake. Moreover, the tolerant genotype showed relatively lower expression PHTs than sensitive ones upon exposure to both As stress and P addition, suggesting regulation of PHTs expression is a major mechanism for relative uptake of As and P, in subsequence affecting As tolerance. Moreover, among 6 PHTs examined in this study, the expressions of PHT1.3, PHT1.4 and PHT1.6 showed the marked difference among the three barley genotypes in responses to As stress and P addition, indicating further research on the contribution of phosphate transporters to As and P uptake should be focused on these PHTs.
[Mh] Termos MeSH primário: Adaptação Biológica
Arseniatos/toxicidade
Regulação da Expressão Gênica de Plantas/efeitos dos fármacos
Hordeum/metabolismo
Proteínas de Transporte de Fosfato/genética
Fosfatos/farmacologia
Poluentes do Solo/toxicidade
[Mh] Termos MeSH secundário: Adaptação Biológica/genética
Arseniatos/metabolismo
Biomassa
Genótipo
Hordeum/genética
Hordeum/crescimento & desenvolvimento
Modelos Teóricos
Fosfatos/metabolismo
Fotossíntese/efeitos dos fármacos
Poluentes do Solo/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Phosphate Transport Proteins); 0 (Phosphates); 0 (Soil Pollutants)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171004
[St] Status:MEDLINE


  4 / 2251 MEDLINE  
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[PMID]:28985538
[Au] Autor:Chillè D; Foti C; Giuffrè O
[Ad] Endereço:Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, 98166 Messina, Italy.
[Ti] Título:Thermodynamic parameters for the protonation and the interaction of arsenate with Mg , Ca and Sr : Application to natural waters.
[So] Source:Chemosphere;190:72-79, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Thermodynamic parameters for the protonation of AsO and for the interaction with Mg , Ca and Sr were reported, comprehensive also of their dependence on ionic strength, considering the 0.1 ≤ I ≤ 1 M range and using NaCl as background salt. The same speciation models were obtained for Mg , Ca and Sr systems, with the formation of three different species: ML, MLH and MLH (L = AsO ). Mono- and di-protonated species were very weak, with formation constant values (log K) ranging from 1.45 to 3.23. In order to have a complete picture of thermodynamic properties of the systems under study and to fill the shortage of thermodynamic data on arsenate complex systems, the ligand protonation and metal complex enthalpies were also determined by calorimetric titrations, at t = 25 °C and in NaCl at I = 0.7 M (for H -AsO species also at I = 0.1 M). On the light of the proposed speciation models, examples of As(V) distribution in some natural waters are reported.
[Mh] Termos MeSH primário: Arseniatos/química
Concentração Osmolar
Termodinâmica
Água/química
[Mh] Termos MeSH secundário: Cálcio/química
Calorimetria
Ligantes
Magnésio/química
Cloreto de Sódio/química
Estrôncio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Ligands); 059QF0KO0R (Water); 451W47IQ8X (Sodium Chloride); I38ZP9992A (Magnesium); SY7Q814VUP (Calcium); YZS2RPE8LE (Strontium)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE


  5 / 2251 MEDLINE  
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[PMID]:28966026
[Au] Autor:Niazi NK; Bibi I; Shahid M; Ok YS; Burton ED; Wang H; Shaheen SM; Rinklebe J; Lüttge A
[Ad] Endereço:Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan; MARUM and Department of Geosciences, University of Bremen, Bremen D-28359, Germany; Southern Cross GeoScience, Southern Cross University, Lismore 2480 NSW, Australia. Electronic address: n
[Ti] Título:Arsenic removal by perilla leaf biochar in aqueous solutions and groundwater: An integrated spectroscopic and microscopic examination.
[So] Source:Environ Pollut;232:31-41, 2018 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, we examined the removal of arsenite (As(III)) and arsenate (As(V)) by perilla leaf-derived biochars produced at 300 and 700 °C (referred as BC300 and BC700) in aqueous environments. Results revealed that the Langmuir isotherm model provided the best fit for As(III) and As(V) sorption, with the sorption affinity following the order: BC700-As(III) > BC700-As(V) > BC300-As(III) > BC300-As(V) (Q = 3.85-11.01 mg g ). In general, As removal decreased (76-60%) with increasing pH from 7 to 10 except for the BC700-As(III) system, where notably higher As removal (88-90%) occurred at pH from 7 to 9. Surface functional moieties contributed to As sequestration by the biochars examined here. However, significantly higher surface area and aromaticity of BC700 favored a greater As removal compared to BC300, suggesting that surface complexation/precipitation dominated As removal by BC700. Arsenic K-edge X-ray absorption near edge structure (XANES) spectroscopy demonstrated that up to 64% of the added As(V) was reduced to As(III) in BC700- and BC300-As(V) sorption experiments, and in As(III) sorption experiments, partial oxidation of As(III) to As(V) occurred (37-39%). However, XANES spectroscopy was limited to precisely quantify As binding with sulfur species as As S -like phase. Both biochars efficiently removed As from natural As-contaminated groundwater (As: 23-190 µg L ; n = 12) despite in the presence of co-occurring anions (e.g., CO , PO , SO ) with the highest levels of As removal observed for BC700 (97-100%). Overall, this study highlights that perilla leaf biochars, notably BC700, possessed the greatest ability to remove As from solution and groundwater (drinking water). Significantly, the integrated spectroscopic techniques advanced our understanding to examine complex redox transformation of As(III)/As(V) with biochar, which are crucial to determine fate of As on biochar in aquatic environments.
[Mh] Termos MeSH primário: Arsênico/química
Carvão Vegetal/química
Poluentes Químicos da Água/química
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Adsorção
Arseniatos
Arsênico/análise
Arsenitos
Água Subterrânea/química
Oxirredução
Perilla
Folhas de Planta/química
Poluentes Químicos da Água/análise
Espectroscopia por Absorção de Raios X
Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Arsenites); 0 (Water Pollutants, Chemical); 0 (biochar); 16291-96-6 (Charcoal); N5509X556J (arsenite); N712M78A8G (Arsenic); N7CIZ75ZPN (arsenic acid)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180208
[Lr] Data última revisão:
180208
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171003
[St] Status:MEDLINE


  6 / 2251 MEDLINE  
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[PMID]:29107877
[Au] Autor:Lin S; Yang H; Na Z; Lin K
[Ad] Endereço:State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China. Electronic address: linsen@ecust.edu.cn.
[Ti] Título:A novel biodegradable arsenic adsorbent by immobilization of iron oxyhydroxide (FeOOH) on the root powder of long-root Eichhornia crassipes.
[So] Source:Chemosphere;192:258-266, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, FeOOH was immobilized on the biodegradable root powder, abbreviated as RP, of long-root Eichhornia crassipes, a kind of waste biomass, to improve the adsorption performances for aqueous arsenic contaminants. The adsorption kinetics and thermodynamics experiments showed that the adsorption rates and capacities of the root powder for arsenate (As(V)) and arsenite (As(III)) were both enhanced markedly after modification with FeOOH. The adsorption of As(V) and As(III) by the modified root powder, abbreviated as MRP, could arrive at equilibrium in 50 min and the saturated adsorption capacities reached up to 8.67-9.43 mg/g for As(V) and 5.21-5.65 mg/g for As(V) at temperature of 10-50 °C, respectively. Besides, the effect of pH and ionic strength on adsorption was investigated and the results showed that the optimum pH for the arsenic adsorption using the MRP was 9.0 and the As(V) adsorption was more sensitive to ionic strength. Furthermore, the complexation of hydratable hydroxyls on FeOOH with arsenic contaminants was concluded as the adsorption force according FTIR and XPS analyses. The MRP used could be regenerated via 0.4 mol/L NaOH solution and no apparent adsorption capacity losses appeared after 6 cyclic utilizations.
[Mh] Termos MeSH primário: Arsenicais/metabolismo
Eichhornia/metabolismo
Preparações de Plantas/metabolismo
Poluentes Químicos da Água/metabolismo
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Adsorção
Arseniatos/metabolismo
Arsênico/metabolismo
Arsenitos/metabolismo
Compostos Férricos/metabolismo
Concentração de Íons de Hidrogênio
Concentração Osmolar
Raízes de Plantas/metabolismo
Termodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Arsenicals); 0 (Arsenites); 0 (Ferric Compounds); 0 (Plant Preparations); 0 (Water Pollutants, Chemical); 2UA751211N (ferric hydroxide); N5509X556J (arsenite); N712M78A8G (Arsenic); N7CIZ75ZPN (arsenic acid)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180130
[Lr] Data última revisão:
180130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171107
[St] Status:MEDLINE


  7 / 2251 MEDLINE  
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[PMID]:29216971
[Au] Autor:Chávez-Capilla T; Maher W; Kelly T; Foster S
[Ad] Endereço:Ecochemistry Laboratory, Institute for Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia. Electronic address: Teresa.GonzalezdeChavezCapila@canberra.edu.au.
[Ti] Título:Evaluation of the ability of arsenic species to traverse cell membranes by simple diffusion using octanol-water and liposome-water partition coefficients.
[So] Source:J Environ Sci (China);49:222-232, 2016 Nov.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Arsenic metabolism in living organisms is dependent on the ability of different arsenic species to traverse biological membranes. Simple diffusion provides an alternative influx and efflux route to mediated transport mechanisms that can increase the amount of arsenic available for metabolism in cells. Using octanol-water and liposome-water partition coefficients, the ability of arsenous acid, arsenate, methylarsonate, dimethylarsinate, thio-methylarsonate, thio-dimethylarsinic acid, arsenotriglutathione and monomethylarsonic diglutathione to diffuse through the lipid bilayer of cell membranes was investigated. Molecular modelling of arsenic species was used to explain the results. All arsenic species with the exception of arsenate, methylarsonate and thio-methylarsonate were able to diffuse through the lipid bilayer of liposomes, with liposome-water partition coefficients between 0.04 and 0.13. Trivalent arsenic species and thio-pentavalent arsenic species showed higher partition coefficients, suggesting that they can easily traverse cell membranes by passive simple diffusion. Given the higher toxicity of these species compared to oxo-pentavalent arsenic species, this study provides evidence supporting the risk associated with human exposure to trivalent and thio-arsenic species.
[Mh] Termos MeSH primário: Arsênico/metabolismo
Membrana Celular/metabolismo
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Arseniatos
Arsênico/toxicidade
Arsenicais
Arsenitos
Difusão
Glutationa/análogos & derivados
Seres Humanos
Lipossomos
Octanóis
Água
Poluentes Químicos da Água/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Arsenicals); 0 (Arsenites); 0 (Liposomes); 0 (Octanols); 0 (Water Pollutants, Chemical); 0 (arsenotriglutathione); 059QF0KO0R (Water); 935XD1L5K2 (arsenous acid); GAN16C9B8O (Glutathione); J37VJ5709S (monomethylarsonic acid); N712M78A8G (Arsenic); N7CIZ75ZPN (arsenic acid)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171220
[Lr] Data última revisão:
171220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171209
[St] Status:MEDLINE


  8 / 2251 MEDLINE  
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[PMID]:28804810
[Au] Autor:Mansouri T; Golchin A; Kouhestani H
[Ad] Endereço:Department of Soil Science, College of Agriculture, University of Zanjan, Zanjan, Iran. t.mansouri2010@gmail.com.
[Ti] Título:Assessing the phytoavailability of arsenic and phosphorus to corn plant after the addition of an acrylic copolymer to polluted soils.
[So] Source:Environ Monit Assess;189(9):450, 2017 Aug 13.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Soil pollution by arsenic increases the potential risk of arsenic entrance into the food chain. The usefulness of maleic anhydride- styrene- acrylic acid copolymer on the mobility and phytoavailability of arsenic was evaluated. Treatments were the concentrations of acrylic copolymer (0, 0.05, 0.10, and 0.20% w/w) and the concentrations of soil total arsenic (0, 6, 12, 24, 48, and 96 mg kg ). Sodium arsenate was added in appropriate amounts to subsamples of an uncontaminated soil to give contaminated soils with different levels of arsenic. The contaminated soils were subjected to a greenhouse experiment using corn as the test crop. The results showed that contamination of soil by arsenic increased the concentrations of soil available arsenic, root and aerial parts arsenic. By the use of acrylic copolymer, the concentration of available arsenic in the soil and the accumulation of arsenic in the root and aerial parts of the corn plant decreased but the dry weights of the root and aerial parts increased significantly. When the concentration of soil total arsenic was 96 mg kg , the application of copolymer at the concentration of 0.20% w/w reduced the concentrations of arsenic in soil, root, and aerial parts by 62.53, 43.65, and 37.00% respectively, indicating that application of acrylic copolymer immobilized arsenic in soils.
[Mh] Termos MeSH primário: Arsênico/análise
Biodegradação Ambiental
Fósforo/análise
Poluentes do Solo/análise
Zea mays/metabolismo
[Mh] Termos MeSH secundário: Arseniatos
Arsênico/metabolismo
Monitoramento Ambiental
Poluição Ambiental
Fósforo/metabolismo
Raízes de Plantas/química
Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Soil); 0 (Soil Pollutants); 27YLU75U4W (Phosphorus); 7XO134LHLN (sodium arsenate); N712M78A8G (Arsenic)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170815
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-6163-4


  9 / 2251 MEDLINE  
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[PMID]:28759655
[Au] Autor:Wang W; Shao Y; Hou H; Zhou M
[Ad] Endereço:School of Resource and Environmental Sciences, Wuhan University, Wuhan, China.
[Ti] Título:Synthesis and thermodynamic properties of arsenate and sulfate-arsenate ettringite structure phases.
[So] Source:PLoS One;12(7):e0182160, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Arsenic is a toxic and carcinogenic contaminant of potential concern. Ettringite [Ca6Al2(SO4)3(OH)12·26H2O] has the ability to incorporate oxyanions as a solid solution with SO42-, which could lower the soluble oxyanion concentrations. Therefore, ettringite containing SO42- and AsO43- has been synthesized. Results indicated that AsO43- could substitute for SO42- inside the channels of ettringite in the form of HAsO42-, and a linear correlation existed between Xinitial solution and Xsolid. The thermodynamic characterization of the solid samples was investigated by means of Visual MINTEQ, a freeware chemical equilibrium model, and the solubility product logK of -48.4 ± 0.4 was calculated for HAsO4-ettringite at 25°C. The Lippmann phase diagram and XHAsO4-XHAsO4,aq plot showed that the solid solution series containing arsenate has HAsO4-poor aqueous solutions in equilibrium. These findings can be helpful to arsenate solidification and arsenate leaching modeling projects.
[Mh] Termos MeSH primário: Arseniatos/química
Minerais/química
[Mh] Termos MeSH secundário: Arseniatos/síntese química
Sulfatos/química
Termodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Minerals); 0 (Sulfates); 0 (ettringite)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170801
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182160


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[PMID]:28679153
[Au] Autor:Praveen A; Mehrotra S; Singh N
[Ad] Endereço:Plant Ecology and Environmental Science Division, National Botanical Research Institute, Lucknow 226001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), India. Electronic address: aashishpraveen45@gmail.com.
[Ti] Título:Rice planted along with accumulators in arsenic amended plots reduced arsenic uptake in grains and shoots.
[So] Source:Chemosphere;184:1327-1333, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:An experiment was designed using phytoremadiation technology to obtain grains of rice safe for consumption. Sixteen plots of size 2 × 2 m were prepared (8 plots were treated with 50 mg kg of sodium arsenate and rest 8 without any treatment). The study was done for two plantations (1st and 2nd plantation). Rice was planted with three accumulators (Phragmites australis, Vetiveria zizanioides and Pteris vitatta) in treated and untreated plot. Arsenic in grains of Actr (R + Pt, R + Ph and R + Vt) for 1st plantation was 0.4, 0.2 and 0.2 mg kg where as in the case of wActr (Ras) it was 3 mg kg . In 2nd plantation the concentration of arsenic in grain of Actr (R + Pt, R + Ph and R + Vt) was 0.1, 0.1 and 0.1 mg kg where as in the case of wActr (Ras) it was 2 mg kg . Significant differences in growth and yield parameters of rice between Actr and wActr in 1st plantation, while for 2nd plantation the activity was reduced in combinations except R + Pt and no significant difference was observed between Actr, Acntr and wActr. The study concluded that combinations of accumulators with crops could be useful for the survival and safe grains in As-contaminated soils but with some amendments in long-term remediation.
[Mh] Termos MeSH primário: Arsênico/análise
Recuperação e Remediação Ambiental
Oryza/química
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Arseniatos
Produtos Agrícolas
Grãos Comestíveis/química
Poluição Ambiental
Oryza/crescimento & desenvolvimento
Oryza/metabolismo
Pteris
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenates); 0 (Soil Pollutants); 7XO134LHLN (sodium arsenate); N712M78A8G (Arsenic)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170707
[St] Status:MEDLINE



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