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| Registros recuperados: 12 | |
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| TAKESHITA,V.; MENDES,K.F.; PIMPINATO,R.F.; TORNISIELO,V.L.. |
| ABSTRACT: Materials with high organic carbon content are studied for the removal of herbicides from water, such as activated carbon. Low cost alternatives should be investigated for the substitution of this type of material in the removal of herbicides from water. In this context, the aim of this research was to evaluate four agro-industrial residues (white grape bagasse, corn straw, peanut shell and soybean hull) as adsorbents of diuron and hexazinone in drinking water. Samples of drinking water were collected from sources used for human consumption. Five concentrations (1, 2, 3, 4 and 5 mg mL-1) of each herbicide were added to the potable water samples. Each experimental unit consisted of 10 mL of a solution of water and herbicide with 0.1 g of each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide retention; Adsorbents; Water remediation; Environmental risk. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100213 |
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| ALMEIDA,C.S.; MENDES,K.F.; JUNQUEIRA,L.V.; ALONSO,F.G.; CHITOLINA,G.M.; TORNISIELO,V.L.. |
| ABSTRACT: The aim of this study was to evaluate diuron sorption, desorption and degradation in two anthropogenic soils (Terra Preta de Índio - TPI) in contrast to a sandy soil (Quartzarenic Neosol - NQo). Sorption-desorption studies were performed by the batch equilibrium method and biodegradation in biometric bottles using radiolabeled diuron in 14C. Freundlich coefficient (Kf) values ranged from 13.50 to 50.41 µmol(1-1/n) L1/n kg-1 in TPI-2 and TPI-1, respectively, indicating very high diuron sorption in anthropogenic soils, following the order: TPI-1 ≥ TPI-2 > NQo (99.10, 98.95 and 60.8%, respectively). Diuron desorption was very low in anthropogenic soils, ranging from 1.36 (TPI-1) to 1.70% (TPI-2), and 24% to NQo. Accumulated diuron mineralization... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bound residue; Mineralization; Sorption isotherms; Amazonian soils. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100233 |
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| TAKESHITA,V.; MENDES,K.F.; ALONSO,F.G.; TORNISIELO,V.L.. |
| ABSTRACT: With extensive use of herbicides in agricultural areas, the risk of contamination of groundwater and surface water by these products has become a worldwide concern. Practices of application or maintenance of soil organic residues that have begun to be used in agriculture for soil nutrition have demonstrated other benefits besides nutrient supplementation, such as reduced mobility and increased soil degradation of herbicides. Because it is the final destination of herbicides, soil and its constituents, especially organic matter in tropical soils, play a prominent role in processes that encompass the dynamics of herbicide molecules. In this context, it is necessary to know the influence of the organic matter and its constituents on the behavior of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorption; Mobility; Biodegradation; Organic carbon. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100304 |
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| INOUE,M.H.; MERTENS,T.B.; MENDES,K.F.; CONCIANI,P.A.; SANTOS,F.S.; FERREIRA,D.G.. |
| ABSTRACT This study aimed to evaluate the control of Rottboelia spp. with the formulated mixture diuron + hexazinone + sulfometuron-methyl and the emergence of this weed in the months of April, May, June, July, August, September, October and November 2012 in sugarcane cultivation, cultivar RB867515. The experimental design consisted of randomized blocks, with treatments in a 4 x 4 factorial arrangement with four replicates for the months of April to November. The emergence tests used a randomized block design, in a 8 x 5 split plot arrangement with four replicates. The analyzed factors were the rates of the formulated mixture (diuron + hexazinone + sulfometuron-methyl), which consisted of: 1,809.00 + 510.00 + 43.50 g ha-1 (T2); 1,507.50 + 425.00 + 36.25 g... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: R. exaltata; Rates; Effectiveness; Saccharum spp. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200229 |
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| CHITOLINA,G.M.; MENDES,K.F.; ALMEIDA,C.S.; ALONSO,F.G.; JUNQUEIRA,L.V.; TORNISIELO,V.L.. |
| ABSTRACT: Herbicides with a high leaching capacity, such as hexazinone, tend to reach deeper soils more easily, where retention of the product affects its availability in the soil solution. Therefore, it is important to understand the behavior of hexazinone at a variety of soil depths. The objective of this research was to evaluate the sorption and desorption of hexazinone throughout the soil profile. The sorption and desorption processes of 14C-hexazinone [triazine-6-14C] at three soil depths (0-10, 10-20, and 20-30 cm) were evaluated by the equilibrium batch method, and the radioactivity of the herbicide was quantified by liquid scintillation spectrometry. Five different concentrations of hexazinone (0.12, 0.19, 0.25, 0.31, and 0.38 µg mL-1) in a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Retention isotherms; Mobile herbicide bioavailability. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100216 |
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| MENDES,K.F.; GOULART,M.O.; INOUE,M.H.; MERTENS,T.B.; SILVA,I.P.. |
| ABSTRACT: Phytosociological studies are extremely important for the management of weeds in cultivated areas. Thus, the goal of this work was to evaluate the interference of mineral oil associated with oxyfluorfen and flumioxazin, through the phytosociological survey of weeds. Therefore, this experiment was conducted in a 2 x 5 + 1 factorial design and with four replications; the following oxyfluorfen + flumioxazin associations were evaluated: 240 + 50, 192 + 40, 144 + 30, 96 + 20 and 48 + 10 g a.i. ha-1, with and without the addition of mineral oil, including a control sample without application. Thirty days after the application, plant density, frequency and abundance of species were determined, and so were frequency, density and relative abundance, as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Similarity index; Herbicide association; Adjuvants. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100230 |
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| GUIMARÃES,A.C.D.; MENDES,K.F.; CAMPION,T.F.; CHRISTOFFOLETI,P.J.; TORNISIELO,V.L.. |
| ABSTRACT: Leaching intensity depends on the physicochemical properties of soils and herbicides. Consequently, a good understanding of this process is essential to determine mitigation measures to reduce or eliminate the risk of water contamination around areas with sugarcane crops. Therefore, the objective of this study was to analyze the leaching of ametryn, diuron, hexazinone, and metribuzin by using columns in five soils with different physicochemical properties cultivated with sugarcane. The radiolabeled herbicides with 14C were evaluated at six soil depths (0-0.05, 0.05-0.10, 0.10-0.15, 0.15-0.20, 0.20-0.25, and 0.25-0.30 m) and in the leachate after 200 mm rainfall simulation for 48 h. Herbicide leaching was mostly affected by soil type. Ametryn and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil behavior; Pre-emergent; Leachate; Mobility. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100228 |
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| MENDES,K.F.; MARTINS,B.A.B.; REIS,F.C.; DIAS,A.C.R.; TORNISIELO,V.L.. |
| ABSTRACT In Brazil, the “Pesticide Act” (Act no. 7,802/89) has introduced new criteria related to the environment, public health and agronomic performance in the analyses of pesticide-related activities. Likewise, radioisotopes are used for environmental behavior and in planta studies, since they provide some advantages in comparison to chemical measures, including greater sensitivity, stepwise description of a particular element in a metabolic system, and pesticide position and detection through X-ray films and/or radio image (in plants) and liquid scintillation (in plants and soil), respectively. This review describes methodologies related to radioisotope utilization in studies on herbicide absorption, translocation and metabolism in plants, as well as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Liquid scintillation spectrometry; Environmental behavior; 14C-labeled molecule. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100232 |
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| CALEGARI,R.P.; MENDES,K.F.; MARTINS,B.C.; PIMPINATO,R.F.; BAPTISTA,A.S.; TORNISIELO,V.L.. |
| ABSTRACT: The intensive use of pesticides, such as the herbicides diuron and hexazinone, leads to a concern about the preservation of the water quality of the water resources destined for human consumption. Currently, conventional water treatment techniques do not have high capacity to remove herbicides; therefore, the need to study other techniques arises. The present study aimed to evaluate the efficiency of the removal of diuron and hexazinone herbicides present in water through a commercial filtration system. The study was carried out in a filtration system composed of the following sequence of filters: sand filter and coconut shell activated granular carbon, polypropylene filter 20 mm, activated carbon filter with silver salts, polypropylene filter 5... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activated granular coal; Reverse osmosis; Herbicide removal; Water treatment. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100346 |
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| VITI,M.L.; ALVES,P.A.T.; MENDES,K.F.; PIMPINATO,R.F.; GUIMARÃES,A.C.D.; TORNISIELO,V.L.. |
| ABSTRACT: Glyphosate is easily exuded by the roots of plants. However, there is still some lack of information in the scientific literature as to whether Urochloa brizantha is capable of exuding glyphosate to influence the growth of crops such as sugarcane and citrus. Thus, the objective of this research was to evaluate the translocation and root exudation of 14C-glyphosate by U. brizantha and its transport in sugarcane and citrus. Sugarcane seedlings, varieties SP80-1842, and citrus ‘Limão Rosa’ (Citrus limonia L. Osbeck) were cultivated with U. brizantha around the seedlings. Using a microsphere, 14C-glyphosate was applied on the leaves of U. brizantha. The plants were cultured for 12 days after treatment (DAT). The radioactivity of the herbicide was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavior in the plant; Radioisotope; Chemical sensitivity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100229 |
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| MENDES,K.F.; SHIROMA,A.T.; PIMPINATO,R.F.; REIS,M.R.; TORNISIELO,V.L.. |
| ABSTRACT: Adjuvants, such as mineral oils, are widely used in the application of herbicides by reducing the drift and evaporation of the droplets and by increasing herbicide uptake by the plant. However, little is known about how mineral oil behaves when in contact with the soil. Thus, the objective of this research was to evaluate the transport of atrazine via leaching with the addition of mineral oil in a soil agricultural under laboratory conditions. To quantify the concentration of the herbicide along the profile of the very clay soil column (30 cm), 14C-atrazine (ring-U-14C) was used with 16,667 Bq of radioactivity per column in volume of 200 mL solution and 0 (control), 1, and 2% mineral oil (v/v) was added in the application volume. Atrazine was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adjuvant; Mobile herbicide; Triazine group; Leachate. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100194 |
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| NOVAIS,J.; MENDES,K.F.; INOUE,M.H.; MACIEL,C.D.G.; HELVIG,E.O.; STANIESKI,C.M.. |
| ABSTRACT: Atrazine is selective for maize, sugarcane and sorghum and may interfere with successor crops such as sunflower and soybean. Despite this problem, there are few studies about the residual effect of this herbicide in these crops. Thus, the objective of the research was to evaluate the residual effect of atrazine through bioavailability of the herbicide in sandy and clayey soils, using soybean and sunflower as bioindicators. The design was completely randomized with four replications and a 2 × 7 + 1 factorial scheme, that is, two doses (2,000 and 2,500 g ha-1), seven application times (0, 15, 30, 45, 60, 75 and 90 days between application (DBA) of herbicide and bioindicator sowing) and one control without application. Dry mass and chlorophyll... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Residual effect; Herbicide; Bioassay method; Soil texture. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100160 |
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| Registros recuperados: 12 | |
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