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Adsorcao de defensivos agricolas em solos dos cerrados: caso do aldicarb. Infoteca-e
CARDOSO, A.N.; FERREIRA, G.; SOUSA, D.M.G. de; REIN, T.A.; OLIVEIRA, S.A. de; COTTA, T.A..
1994
Tipo: Outras publicações técnicas (INFOTECA-E) Palavras-chave: Agricultura; Defensivo agricola; Adsorcao; Solo; Cerrado; Aldicarb; Agriculture; Adsorption; Soil.
Ano: 1994 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/549409
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Adsorção e lixiviação de trifluralin e imazaquin em diferentes solos. Repositório Alice
PIRES, N. de M.; SILVA, J.F.da; SILVA, J.B.da; FERREIRA, L.R.; CARDOSO, A.A..
Com o objetivo de avaliar a adsorcao e lixiviacao de trifluralin e de imazaquin em materiais de solo com diferentes texturas, foram montados varios ensaios em laboratorio em casa de vegetacao. A adsorcao e lixiviacao de trifluralin, formulacao 600 g/l foram estudadas em laboratorio utilizando como planta-teste o sorgo, onde foi estudadas em laboratorio utilizando como planta-teste o sorgo, onde foi avaliado o efeito do produto sobre a inibicao do crescimento da radicula em sementes pre-germinadas e incubadas em um germinador com temperatura de 25 +/- 1oC por 48 horas. O imazaquin foi avaliado em casa de vegetacao com temperatura variando de 25 a 30oC, empregando como planta-teste o milho, que foi cortado rente ao solo e determinado o peso frescas da parte...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Herbicida; Adsorcao; Lixiviacao; Trifluralin; Imazaquin; Herbicide; Adsorption; Leaching.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/478273
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Adsorption capacity of phenolic compounds onto cellulose and xylan Ciênc. Tecnol. Aliment.
Costa,Telma dos Santos; Rogez,Hervé; Pena,Rosinelson da Silva.
The interaction between three phenolic compounds (catechin, caffeic acid and ferulic acid) onto two dietary fibres (cellulose and xylan) has been evaluated to inquire possible interferences on the biodisponibility of phenolic compounds. The adsorption kinetics were performed using solutions containing 100 mg/L of phenolic compounds during a contact time ranging between 10 and 120 minutes at pH 2.0, 4.5, and 7.0. After the kinetics, isotherms were obtained using phenolic compounds concentration ranging between 10 and 80 mg/L during 60 minutes, at pH 2.0 and 7.0 and temperature of 36 °C. Results indicate that adsorbed quantities mainly changed in function of pH, however the maximum adsorption was only of 0.978 mg of caffeic acid/g of xylan at pH 2 and after...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cellulose; Xylan; Adsorption; Phenolic compounds; Isotherm; In vitro tests.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000200314
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Adsorption of glyphosate on clays and soils from Paraná State: effect of pH and competitive adsorption of phosphate BABT
Cruz,Lútecia Hiera da; Santana,Henrique de; Zaia,Cássia Thaïs Bussamra Vieira; Zaia,Dimas Augusto Morozin.
This work showed that the adsorption of glyphosate (GPS) depends on surface area for clays and amount of clays and CEC for soils. Organic matter (OM) had a secondary role in the adsorption of GPS on soils. The adsorption of GPS on soils from Londrina and Floraí counties and clays (montmorillonite, kaolinite) decreased when pH increased, however, for bentonite clay and soil from Tibagi county was kept constant. For the soils, the competitive adsorption between GPS and phosphate showed that displace of GPS by phosphate was related to the amount of clays, CEC and pH. GPS was not easily displaced by phosphate on the clays. The FT-IR spectra of the soils and clays showed that soil from Londrina resembled kaolinite. Thus, this could explain the results of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glyphosate; Adsorption; Clays; Soils.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300004
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Adsorption of natural dyes on clay fixed on polymers BABT
Lopes,Toni Jefferson; Gonçalves,Odinei Hess; Barros,Ricardo Barbosa; Capelli,Francine Carla Rodrigues; Machado,Ricardo Antonio Francisco; Quadri,Mara Gabriela Novy; Quadri,Marintho Bastos.
The main purpose of this work was to produce a pellet to minimize undesirable effects in fixed beds, such as colmatation, through clay fixation on the surface of polymeric particles. Preliminary experiments were carried out by heating the clay, namely Tonsil Terrana 580FF, in order to observe variations on its capacity to adsorb anthocyanins derived from red cabbage. Clays was fixed on five samples of high density polyethylene (HDPE) at 180°C -210°C for two hours. The morphological analyses of the resulting particles were accomplished through Scanning Electron Microscopy (SEM). The experiments demonstrated an increase on clay's adsorptive capacity of 15.65% at 120°C for 30 hours and 16.80% at 170°C for two hours. The SEM analysis showed that the clay...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adsorption; Clay; Polymer; Anthocyanin/red cabbage.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400034
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Adsorption of SOX and NOX in activated viscose fibers Anais da ABC (AABC)
Plens,Ana Carolina O.; Monaro,Daniel L.G.; Coutinho,Aparecido R..
SOx and NOx are emissions resulting from combustion processes and are the main agents that contribute to the formation of acid rain, which causes harm to humans and the environment. Several techniques for removing these pollutants are applied in i.e. oil refineries, thermoelectric that use petroleum oils and vehicular pollution. Among these, highlight the adsorption of contaminants by the usage of activated carbon fibers and activated carbon, which are characterized by high surface area and uniform distribution of pores, providing appropriate conditions for application in processes of removing environmental contaminants. In the present work, activated viscose fibers (AVF) were prepared and applied in adsorption experiments of NO and SO2. The materials...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activated carbon; Activated fibers; Adsorption; NOx; SOx.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201149
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An automated method for the assessment of mercury adsorption rates on particulate suspended matter OMA
Baeyens, W.F.J.; Decadt, G.; Dehairs, F.A.; Goeyens, L..
A continuous filtration system connected to a mercury auto-analyzer has been constructed for obtaining mercury adsorption rates on particulate suspended matter. The capabilities of this device have been demonstrated by carrying out a series of experiments under controlled physicochemical parameter conditions on samples of the Scheldt estuary. Duplicate measurements showed coefficients of variation ranging from 1 to 6 %. Depending on the physico-chemical conditions, the initial adsorption rate per unit of dissolved mercury concentration varied between 1.2 and 8.1 x 10<sup>-2</sup> mn<sup>-1</sup>.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adsorption; Mercury; Methodology; Particulates; Suspended matter.
Ano: 1982 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3413
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Applicability of Moringa oleifera Lam. pie as an adsorbent for removal of heavy metals from waters AGRIAMBI
Gonçalves Junior,Affonso C.; Meneghel,Ana P.; Rubio,Fernanda; Strey,Leonardo; Dragunski,Douglas C.; Coelho,Gustavo F..
This study evaluated the efficacy of moringa seeds (Moringa oleifera Lam.) as an adsorbent material for removing toxic heavy metals such as cadmium, lead, and chromium from contaminated solutions. The effect of the adsorbent mass was investigated at two pH conditions (5.0 and 7.0). The optimized conditions were 0.300 g of adsorbent at pH 5.0, used for the isotherms construction, and linearized according to Langmuir and Freundlich models. Results showed that cadmium adsorption was similar in both the models used. For lead, the Freundlich model had the best adjustment and chromium was better adjusted by the Langmuir model. It was concluded that the adsorbent was effective in the remediation of solutions containing cadmium, lead and chromium, thus, its use as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adsorption; Isotherms; Remediation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000100013
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Application of mathematical models for the prediction of adsorption isotherms in solid mixture for mango powder refreshment Ciênc. Tecnol. Aliment.
Clemente,Edmar; Afonso,Marcos Rodrigues Amorim; Souza,Ana Paula; Correia,José Maria; Pires,Raquel Gomes; Maia,Geraldo Arraes.
Solid mixtures for refreshment are already totally integrated to the Brazilian consumers' daily routine, because of their quick preparation method, yield and reasonable price - quite lower if compared to 'ready-to-drink' products or products for prompt consumption, what makes them economically more accessible to low-income populations. Within such a context, the aim of this work was to evaluate the physicochemical and mineral composition, as well as the hygroscopic behavior of four different brands of solid mixture for mango refreshment. The BET, GAB, Oswim and Henderson mathematical models were built through the adjustment of experimental data to the isotherms of adsorption. Results from the physiochemical evaluation showed that the solid mixtures for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adsorption; Isotherms; Mathematical models; Nutritious powders; Refreshment; Mango.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000300010
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Atrazine movement in a dark red latosol of the tropics Scientia Agricola
Souza,M.D. de; Basssoi,L.H.; Bacchi,O.O.S.; Reichardt,K.; Hermes,L.C.; Abakerli,R.B.; Pilotto,J.E..
Atrazine displacement was studied in a soil profile as a function of water movement and time after herbicide application, taking into account possible influence of preferential flow on leaching. The experiment consisted of two 7 x 7m plots of a dark red latosol (Kanduidalfic Eutrudox), located at Piracicaba, SP, Brazil (22º 43'S and 47º 25'W), 250km inside continent, at an altitude of 580m. One plot was previously treated with 1,000 kg/ha of lime, in order to increase base saturation to 88%, and 500kg/ha of gypsum. Each plot was instrumented with tensiometers, neutron probe access tubes and soil solution extractors, in order to monitor water and atrazine flows. Atrazine was applied at the high rate of 6 kg/ha of active principle. Results showed intensive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atrazine; Leaching; Preferential flow; Adsorption; Herbicide; Tropical soil.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300013
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Biochar association with phosphate fertilizer and its influence on phosphorus use efficiency by maize Ciência e Agrotecnologia
Santos,Sara Ramos dos; Lustosa Filho,José Ferreira; Vergütz,Leonardus; Melo,Leônidas Carrijo Azevedo.
ABSTRACT The use of fertilizers with some degree of protection of the phosphate ions can reduce soil adsorption and increase the absorption by plants, increasing the efficiency of phosphorus (P) fertilization. This study aimed to evaluate the performance of a phosphate fertilizer associated with biochar in granules in a P-fixing soil in a greenhouse experiment. Biochars were produced from two sources of biomass: sugarcane bagasse (SB) and wood sawdust (WS), which were pyrolysed at two temperatures (350 °C and 700 °C). After chemical and physical characterization, the biochar samples were granulated with triple superphosphate (TSP) in a 3:1 ratio (TSP: biochar). The agronomic evaluation of the fertilizers was carried out by two successive maize crops (Zea...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic residues; Adsorption; Pyrolysis; Tropical soils..
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100202
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Biosolids and heavy metals in soils Scientia Agricola
Silveira,Maria Lucia Azevedo; Alleoni,Luís Reynaldo Ferracciú; Guilherme,Luiz Roberto Guimarães.
The application of sewage sludge or biosolids on soils has been widespread in agricultural areas. However, depending on their characteristics, they may cause increase in heavy metal concentration of treated soils. In general, domestic biosolids have lower heavy metal contents than industrial ones. Origin and treatment method of biosolids may markedly influence their characteristics. The legislation that controls the levels of heavy metal contents in biosolids and the maximum concentrations in soils is still controversial. In the long-term, heavy metal behavior after the and of biosolid application is still unknown. In soils, heavy metals may be adsorbed via specific or non-specific adsorption reactions. Iron oxides and organic matter are the most important...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sewage sludge; Adsorption; Speciation; PH; Organic matter.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400029
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Brazilian natural fiber (jute) as raw material for activated carbon production Anais da ABC (AABC)
ROMBALDO,CARLA F.S.; LISBOA,ANTONIO C.L.; MENDEZ,MANOEL O.A.; COUTINHO,APARECIDO R..
Jute fiber is the second most common natural cellulose fiber worldwide, especially in recent years, due to its excellent physical, chemical and structural properties. The objective of this paper was to investigate: the thermal degradation of in natura jute fiber, and the production and characterization of the generated activated carbon. The production consisted of carbonization of the jute fiber and activation with steam. During the activation step the amorphous carbon produced in the initial carbonization step reacted with oxidizing gas, forming new pores and opening closed pores, which enhanced the adsorptive capacity of the activated carbon. N2 gas adsorption at 77K was used in order to evaluate the effect of the carbonization and activation steps. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activation; Adsorption; Carbonization; Jute fiber; Thermogravimetry.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402137
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Comment on &#8220;Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn (II) ions detoxification from waste water using unmodified and EDTA-modified maize husk&#8221; Electron. J. Biotechnol.
Cavas,Levent.
The citing and using of correct version of mathematical equations are of great importance in the writing of a scientific paper. This paper presents the possible errors related to Dubinin-Radushkevich Equation in an article by Igwe and Abia (2007) which was published in Electronic Journal of Biotechnology, 10(4); 536-548.
Tipo: Journal article Palavras-chave: Adsorption; Calculation errors; DR equation.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200001
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Comportamento da atrazina em solos brasileiros em condicoes de laboratorio. Repositório Alice
NAKAGAWA, L.E.; LUCHINI, L.C.; MUSUMECI; M.R.; ANDREA, M.M. de.
A persistencia, a mobilidade e as constantes de adsorcao da atrazina foram estudadas em condicoes de laboratorio, em dois tipos de solos (Gley Humico e Latossolo Vermlho-Escuro) durante 180 dias apos a aplicacao da C-atrazina as amostras de solos, incubadas a temperatura de 25C, no escuro. A meia-vida da atrazina foi de 56 dias no solo Gley Humico e 54 dias no solo Latossolo Vermelho-Escuro. O principal produto da degradacao detectado nos dois solos foi a hidroxiatrazina, e, em maior concentracao, no solo Gely Humico. Outros dois metabolitos de atrazina, a deetilatrazina e a deisopropilatrazina, foram tambem detectados, porem, em menor concentracaao nos dois solos. A atrazina apresentou uma constante da adsorcao semelhante nos dois solos: K=2,6 no Gley...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Adsorcao; Mobilidade; Hidroxiatrazina; Persistencia; Herbicida; Adsorption; Mobility; Hydroxyatrazine; Persistence; Herbicide.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104205
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Compréhension des mécanismes d'adhésion des biofilms en milieu marin en vue de la conception de nouveaux moyens de prévention ArchiMer
Rubio, Celine.
Biofilm formation on surfaces immersed in sea water induces equipment damages. Recently, studies focused on the environmental impact of antifouling paints have shown that some active chemical compounds are harmful to the aquatic environment. Hence, it appears fundamental to study physico-chemical interactions existing between marine bacteria and various substrata to conceive new ecological products or antifouling processes. First, we model an artificial primary organic film, formed by the adsorption of BSA and polysaccharide, as close as the one formed in natural seawater. This organic film is heterogeneous (only 42% of the surface is covered) and organic adsorption occurs in a multi-layer scheme, molecules bounded each others by calcium and magnesium...
Tipo: Text Palavras-chave: Sea water; Marine bacteria; Physico chemical characterisation; MATS; XPS; IRAS; Adsorption; Bacterial adhesion; Biofim; Eau de mer; Bactéries marines; Caractérisation physicochimique; MATS; XPS; IRRAS; Adsorption; Adhésion bactérienne; Biofilm.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/these-222.pdf
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Continuous Stabilization of Chardonnay with Ion-Exchage Resin: Influence on Protein and Phenolic Profile of Wine Chilean J. Agric. Res.
de Bruijn,Johannes; Valdebenito,Ana; Loyola,Cristina; Serra,Ignacio; Salazar,Fernando; López,Francisco.
Unstable proteins may react with polyphenols, forming haze and precipitation in white wines. Therefore, the adsorption of these wine proteins is an essential step in the production of white wines. The objective of this study was to determine the influence of adsorption of these proteins on the stability, and protein and phenolic composition of a Chardonnay wine. In this work, protein stabilization of Chardonnay wine was done by continuous adsorption using a packed bed with a SP-Trisacryl-M adsorbent (Sigma-Aldrich). A more pronounced breakthrough of proteins and turbidity causing compounds was found after treating 65 bed volumes of wine by the resin. An increased retention of the protein fraction of 20-50 kDa during the first 62 bed volumes of treated wine...
Tipo: Journal article Palavras-chave: Adsorption; Trisacryl; Fining; Chile.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100007
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Contrasting tree effects on soil P sorption and availability on a Xanthic Ferralsol. Repositório Alice
CAMPOS, C. E. B.; LEHMANN, J..
The central objective of these work is the investigation of the availability of soil P as affected by two tree species (cupuacu, urucu, pueraria) with widely different P return, in tne Manaus-AM (Brasil). Phosphorus adsorption did not increase with an exposure longer than 8 h. Therefore, adsorption isotherms can be done within 8 h in the studied soils. In general, about 50% of the added P were adsorbed by the soil matrix. The adsorption decreased for soils which received higher amounts of P fertilizer, indicating that adsorption sities were already blocked by previous fertilization. soils under cupuacu adsorbed more of the added P than soil under ururcu (annatto). This can be explained by the high amounts of organic P which is present in soils under urucu...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Floresta tropical umida; Conservacao do solo; Agrofloresta; Cultivo multiple; Bactris gasipaes; Pupunha; Theobroma grandiflorum; Cupuacu; Pueraria phaseoloides; Raiz; Adubacao; Fertilizante fosfatado; Absorcao; Tropical rain forests; Soil conservation; Agroforestry; Multiple cropping; Root; Fertilizers application; Potash fertilizers; Adsorption.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/670034
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Copper adsorption in tropical oxisols BABT
Silveira,Maria Lucia Azevedo; Alleoni,Luís Reynaldo Ferracciú.
Cu adsorption, at concentrations between 0 to 800 mg L-1, was evaluated in surface and subsurface samples of three Brazilian soils: a heavy clayey-textured Rhodic Hapludalf (RH), a heavy clayey-textured Anionic ''Rhodic'' Acrudox (RA) and a medium-textured Anionic ''Xanthic'' Acrudox (XA). After adsorption, two consecutive extractions were performed to the samples which received 100 mg L-1 copper. Surface samples adsorbed higher amounts of Cu than the subsurface, and exhibited lower Cu removed after the extractions, reinforcing the influence of the organic matter in the reactions. Cu adsorption was significant in the subsurface horizons of the Oxisols, despite the positive balance of charge, demonstrating the existence of mechanisms for specific...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adsorption; Isotherms; Desorption; Tropical soil.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400006
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Development of moisture isotherms for Momordica charantia and Carica papaya CIGR Journal
Rupasinghe, chintha Priyangani; Jayasinghe, Udara; Sugathapala, Thusitha.
Safe moisture of a product is important in drying of agricultural products to prevent it from deterioration. The equilibrium moisture content (EMC) is an important parameter in modeling and simulation of drying process. The objectives of the research are development of an EMC curve for Agricultural Products; bitter gourd (Momordica charantia) and papaya (Carica papaya) and to test the suitability of mathematical models of modified Henderson’s equations. The study is performed on the basis of adsorption of moisture content, at three temperatures (30, 40 & 50°C) and four relative humidity (Rh) (10, 30, 50 and 80%). Salt solutions with concentrations were used to maintain Rh. The statistical analysis was done to find the best model and the significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Post harvest technology Equilibrium moisture content; Adsorption; Isotherms; Mathematical model.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5114
Registros recuperados: 66
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