Consulta: subjectFacets:"Water contamination"
Registros recuperados: 9
Data/hora: 01/06/2024 08:22:49

ADSORPTION OF ATRAZINE BY BIOCHARS PRODUCED FROM BYPRODUCTS OF THE WOOD INDUSTRY
Provedor de dados: 70
Autores: Fruehwirth,Marcelo; Sbizzaro,Mariana; Rosa,Danielle M.; Sampaio,Silvio C.; Reis,Ralpho R. dos.
ABSTRACT Atrazine is a herbicide widely used in agriculture; however, because of its toxicity, alternatives are needed to remove this compound from the environment. In this study, we investigated the adsorption process and the atrazine-adsorbing ability of three biochars produced at different pyrolysis temperatures from byproducts of the wood industry. The biochars were characterized by Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and their physical characteristics were evaluated by Brunauer-Emmett-Teller (BET) analysis. The biochar pyrolyzed at 350 °C (BM350) adsorbed 26.04% of the herbicide, showing the best performance among the three biochars tested, even though it had the lowest specific surface area (1.467 m2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Isotherm; Functional groups; Kinetics models.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600769

Vermicompost and biochar substrates can reduce nutrients leachates on containerized ornamental plant production
Provedor de dados: 75
Autores: Alvarez,José M; Pasian,Claudio; Lal,Rattan; López,Rafael; Fernández,Manuel.
ABSTRACT Containerized ornamental plant production is facing several environmental challenges. One of them is to replace the widely used, but with questionable sustainability, peat based substrates and another is to avoid water contamination by chemicals leaching from the nursery. Therefore, as have been verified that petunia and pelargonium plants can be produced in peat-based growing media partially replaced by vermicompost (V) and biochar (B) without decreasing commercial quality, this study has focused on analyzing the leachate from a standard peat-based substrate as a control, used for producing these two ornamental species, and those from the same substrate to which different proportions in volume of V (10% and 20%) and B (4% and 12%) have been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Petunia hybrida; Pelargonium peltatum; Peat replacement; Water contamination; Nitrate; Phosphate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100047

Water quality and pollution reduction.
Provedor de dados: 14
Autores: NICODEMO, M. L. F.; MATTHIENSEN, A.; OLIVEIRA FILHO, E. C. de; PEREIRA, L. A.; BRITO, L. T. de L.; OTENIO, M. H.; OLIVEIRA, M. D. de; SCORZA JUNIOR, R. P.
This chapter addresses Embrapa?s contribution to target 6.3, which relates to water quality and pollution reduction. Decreasing the availability of good quality water is a growing and global concern. Monitoring water quality, coupled with the adoption of good soil and water management practices and the use of technologies to reduce the production of contaminants, can contribute significantly to minimizing this problem and ensuring good quality water for all. The present chapter sought to list search results that point out paths that can be followed. More information is available on the portal Technological Solutions at Embrapa (Embrapa, 2017b).
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Recovery of water quality; Pollution preservation; Reduction pollutant load; Integrated water use; Ecosystem restoration; Water contamination; Qualidade da Água; Desenvolvimento Sustentável; Manejo de Água.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1131186

Nitrate and ammonium in soil solution in tobacco management systems
Provedor de dados: 90
Autores: Kaiser,Douglas Rodrigo; Reinert,Dalvan José; Reichert,José Miguel; Streck,Carlos Arnoldo; Pellegrini,André.
Tobacco farmers of southern Brazil use high levels of fertilizers, without considering soil and environmental attributes, posing great risk to water resources degradation. The objective of this study was to monitor nitrate and ammonium concentrations in the soil solution of an Entisol in and below the root zone of tobacco under conventional tillage (CT), minimum tillage (MT) and no-tillage (NT). The study was conducted in the small-watershed Arroio Lino, in Agudo, State of Rio Grande do Sul, Brazil. A base fertilization of 850 kg ha-1 of 10-18-24 and topdressing of 400 kg ha-1 of 14-0-14 NPK fertilizer were applied. The soil solution was sampled during the crop cycle with a tension lysimeter equipped with a porous ceramic cup. Ammonium and nitrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrate leaching; Agricultural watershed; Water contamination; Tension lysimeter.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000200011

Influence of land use/occupation on water quality in the Trussu river valley, Ceará, Brazil
Provedor de dados: 124
Autores: Neto,José Ribeiro de Araújo; Andrade,Eunice Maia de; Palácio,Helba Araújo de Queiroz; Sales,Maria Monaliza de; Maia,Anthony Rafael Soares.
ABSTRACT The growing pressure on water resources has reduced its availability as regards quality. Data was investigated for two different periods, with the aim of evaluating the influence of the use and occupation of space on the temporal dynamics of the quality of surface and groundwater in the perennialised valley of the Trussu River in the State of Ceará, Brazil. The first period was from September 2002 to February 2004 and the second from April 2013 to April 2014. Twenty-two water samples were taken from nine sampling stations, five on the surface and four underground. The same stations were considered, monitoring 12 attributes of water quality for a total of 2,376 analyses. Temporal dynamics were characterised employing a technique of multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Multivariate analysis; Semi-arid region.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100059

Vegetal test-system investigation on cytotoxicity of water from urban streams located in the northeastern region of Maringá, Paraná State, Brazil - doi: 10.4025/actascibiolsci.v33i1.4924
Provedor de dados: 3
Autores: Düsman, Elisângela; Universidade Estadual de Maringá; Faria, Juliana Sala de; Universidade Estadual de Maringá; Toledo, Fabiana; Universidade Estadual de Maringá; Mazeti, Camila Montoro; Universidade Estadual de Maringá; Gonçalves, Marcus Eduardo Kamide; Universidade Estadual de Maringá; Vicentini, Veronica Elisa Pimenta; Universidade Estadual de Maringá.
The increase in consumption of water, the destruction of riparian forests and the pollution caused by humans, have severely degraded several water resources. Numerous stream crisscross the city of Maringá, Paraná state, Brazil and most of their sources are scattered through the urban region. Current analysis assesses the cytotoxic potential of water from the Corregozinho, Isalto, Morangueira and Ozório streams, located within the high-populated northeastern region of Maringá, inside the urban perimeter. Root meristematic cells of Allium cepa were used as test-system. The roots of onion were prepared by Feulgen’s reaction and stained with Schiff's reagent. Results showed that there were no statistically significant changes evaluated by the chi-square test...
Palavras-chave: 2.02.00.00-5; 2.02.06.00-3 environmental mutagenesis; Water contamination; Allium cepa Mutagênese environmental mutagenesis; Water contamination; Allium cepa.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/4924

Agricultural exploitation impact on the quality of natural waters in the trout-breeding region of the Mantiqueira ecological corridor
Provedor de dados: 3
Autores: Santos, Gabriele Medeiros dos; Empresa Brasileira de Pesquisa Agropecuária; Assad, Maria Leonor Ribeiro Casimiro Lopes; Empresa Brasileira de Pesquisa Agropecuária; Hott, Marcos Ciccarini; Empresa Brasileira de Pesquisa Agropecuária; Otenio, Marcelo Henrique; Embrapa Gado de Leite Empresa Brasileira de Pesquisa Agropecuária (Embrapa) Juiz de Fora/MG.
Seasonal assessment of water quality was undertaken in an agricultural cattle-raising and trout-breeding region. Seventeen sites were sampled in ten municipalities close to the Papagaio and Ibitipoca State Parks in Minas Gerais, Brazil. Landsat 5 satellite images and Spotmap mosaic images with resolution of 2.5 m were employed to correlate classes of land use and topographic characteristics with the environmental contamination index of the water bodies at these sites. Results show a change in hydric classification of three sites evaluated. During the rainy season, sites 3, 7 and 17 were classified as class 3 according to CONAMA regulations, whereas the other sites were classified as class 2. During the dry season, sites 10 and 11 belonged to class 3 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.03.00.00-8 water classification; Water contamination; Monitoring; Geo-referencing Ciências Agrárias.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/19551

Environmental risk increase due to heavy metal contamination caused by a copper mining activity in Southern Brazil
Provedor de dados: 42
Autores: BIDONE,EDISON D.; LAYBAUER,LUCIANO; CASTILHOS,ZULEICA C.; MADDOCK,JOHN L.
The Camaquã Copper Mines (CCM) were the main sulphide deposit in Southern Brazil and have been in operation from last century to 1996. To evaluate water contamination and environmental risk increase by heavy metals from mining operations, two points on the João Dias Creek were sampled (Station 1, background area and Station 2, contaminated area). Mining activity increased the natural weakly heavy metal fluxes by approximately 5424 kg. ( ~ 60%) of the total metal flux, 1542 kg. ( ~ 49%) of dissolved and 3881 kg ( ~ 66%) of particulate metal flux. Total metal flux of anthropic origin was mostly due to Fe followed by Cu &gt; Zn &gt; Mn whereas Cd, As and Pb fluxes were negligible. The potential human health hazards and risk assessment related to daily intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Environmental risk; Heavy metals; Copper mining.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200011

Effect of potassium on the leaching of chemical species in a soil treated with sewage sludge
Provedor de dados: 52
Autores: Paglia,Edmilson Cezar; Serrat,Beatriz Monte; Freire,Clarice Azevedo de Luna; Sirtoli,Ana Rosa dos Anjos; Veiga,Andrea Mayer.
The objective of this research was to evaluate the potassium interference, used as supplementary fertilization, in the ions leaching, in a soil that was treated with alkalinized sewage sludge and cultivated, with maize. The experimental set with sewage sludge results showed an increase of the potassium concentration and chloride concentration in the leached solution, as well as the reduction of the Al3+ concentration, as the doses of potassium fertilizer applied to the soil were increased, for the four leachings. The presence of sewage sludge treated with lime increased the concentration of NO3 -, Cl-, Ca2+, Mg2+ and Al3+ in the solutions in the majority of leachings. Values of Al3+ were higher than 0.1 mg L-1, than in all leachings when sewage sludge was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosoli; Ionic leaching; Water contamination; Environmental pollution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000400004