Sorção-dessorção do fungicida clorotalonil em solos com diferentes teores de matéria orgânica

Regitano, Jussara Borges; Prata, Fábio; Dias, Nívea Maria Piccolomini; Lavorenti, Arquimedes; Tornisielo, Valdemar Luiz

doi:10.1590/s0100-06832002000100028

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…In another study, [2] verified that the magnitude of the slow phase was more pronounced in a sandy, low SOC probably due to its scarcity of external sites for fast reaction. In another study, [2] verified that the magnitude of the slow phase was more pronounced in a sandy, low SOC probably due to its scarcity of external sites for fast reaction.…”

Section: Reprintsmentioning

confidence: 83%

“…Jonge et al [28] observed that a two-stage model, as proposed by Streck et al [29] was adequate to describe both the biphasic adsorption kinetics of prochloraz in different soils as well as the sorption nonsingularity. According to Regitano et al, [2] this behavior is likely related to the high soil:solution ratio (5 g:10 mL) and to the shaking procedure involved in batch experiments, which allow immediate contact between the herbicide molecules and the most available sites of the soil colloids (i.e., the external sites). Region 1 is in direct contact with the solution phase, while region 2 only exchanges with region 1.…”

Section: Reprintsmentioning

confidence: 99%

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Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

Inoue

Oliveira

Regitano³

et al. 2004

Journal of Environmental Science and Health, Part B

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Sorption kinetics of atrazine and diuron was evaluated in soil samples from a typical landscape in Paraná. Samples were collected (0-20 cm) in a no-tillage area from Mamborê, PR, which has been cultivated under a crop rotation for the last six years. Six sampling points of the slope were selected to represent a wide range of soil chemical and physical properties found in this area. Radiolabeled tracers (14C-atrazine and 14C-diuron) were used and the radioactivity was detected by liquid scintillation counting (LSC). Sorption was accomplished for increasing equilibration periods (0.5, 1.5, 3, 6, 12, 24, and 48 h). Kinetics data fitted adequately well to Elovich equation, providing evidences that soil reaction occurs in two distinct stages: a fast, initial one followed by a slower one. During the fast phase, 34-42 and 71-79% of total atrazine and diuron applied were sorbed to soil samples. No important differences were found among combinations of soil and herbicide sorption during the slow phase. The unrealistic conditions under batch experiments should be overestimating sorption in the fast phase and underestimating diffusion in the slow phase. Sorption of both herbicides was positively correlated to organic carbon and clay contents of soils, but atrazine was much less sorbed than diuron, showing its higher potential to contaminate groundwater, specially in sandy, low organic carbon soils.

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Section: Reprintsmentioning

confidence: 83%

Section: Reprintsmentioning

confidence: 99%

Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

Inoue

Oliveira

Regitano³

et al. 2004

Journal of Environmental Science and Health, Part B

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“…Several reports were found in languages other than English (see, e.g. Regitano et al, 2002; Rocha et al, 2013) but, as these did not met the criteria outlined above, they were not included. No geographical limitations were employed.…”

Section: Methodsmentioning

confidence: 99%

An assessment of potential pesticide transmission, considering the combined impact of soil texture and pesticide properties: A meta‐analysis

McGinley

O'Driscoll

Healy

et al. 2022

Soil Use and Management

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Pesticides are widely employed as a cost‐effective means of reducing the impacts of undesirable plants and animals. The aim of this paper is to develop a risk ranking of transmission of key pesticides through soil to waterways, taking into account physico‐chemical properties of the pesticides (soil half‐life and water solubility), soil permeability, and the relationship between adsorption of pesticides and soil texture. This may be used as a screening tool for land managers, as it allows assessment of the potential transmission risks associated with the use of specified pesticides across a spectrum of soil textures. The twenty‐eight pesticides examined were differentiated into three groups: herbicides, fungicides and insecticides. The highest risk of pesticide transmission through soils to waterways is associated with soils containing <20% clay or >45% sand. In a small number of cases, the resulting transmission risk is not influenced by soil texture alone. For example, for Phenmedipham, the transmission risk is higher for clay soils than for silt loam. The data generated in this paper may also be used in the identification of critical area sources, which have a high likelihood of pesticide transmission to waterways. Furthermore, they have the potential to be applied to GIS mapping, where the potential transmission risk values of the pesticides can be layered directly onto various soil textures.

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“…Porém, a chegada da molécula a esses diferentes destinos é de complexa avaliação, uma vez que sofre influência de vários fatores como: condições climáticas, propriedades físico-químicas do pesticida e do solo etc. Entre as propriedades do solo, destaca-se a matéria orgânica, que pode tanto acelerar a degradação do pesticida, por estimular nutricionalmente a microbiota, quanto torná-lo mais persistente ao solo, por adicionar a ele sítios de sorção (REGITANO et al, 2002). Como os herbicidas são tipicamente usados quando a cultura está ausente ou nos primeiros estágios de desenvolvimento, eles alcançam o solo exposto mais freqüentemente que os fungicidas e inseticidas (SEGUERS et al, 2003), sendo, portanto, extremamente relevante o estudo de seus efeitos nesse ambiente.…”

Section: Uso De Pesticidas No Solounclassified

Comportamento ambiental da ametrina e suas influências sobre a diversidade da comunidade microbiana dos solos

Chaves¹

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O herbicida ametrina é relativamente persistente no meio ambiente e está entre os cinco mais usados junto à cultura da cana-de-açúcar no Brasil. Técnicas radiométricas e moleculares foram utilizadas neste estudo para avaliar o potencial de sorção/dessorção e a biodegradação da ametrina, além do impacto do tempo de residência deste herbicida sobre a estrutura e a diversidade da comunidade microbiana, respectivamente. Os solos foram coletados em áreas florestais, sem histórico de aplicação de ametrina, sendo que um deles apresentou textura mais argilosa (NVef) e o outro mais arenosa (RQo). A ametrina apresentou baixo a moderado potencial de sorção (K d = 2,2 e 9,9 L kg-1 nos solos RQo e NVef, respectivamente). Paralelamente, a taxa de biodegradação (t 1/2 = 16 e 36 dias nos solos NVef e RQo, respectivamente) e a formação de resíduos ligados de 14 C-ametrina ao solo (59 e 38 % da quantidade aplicada nos solos NVef e RQo, respectivamente) foram muito maiores no solo NVef, mostrando sua maior taxa de dissipação. Houve também a formação de um metabólito de importância ambiental, o qual correspondeu a 19 e 26 % da quantidade aplicada após 70 dias da aplicação nos solos RQo e NVef, respectivamente. O DNA total foi extraído dos solos, com posterior uso da técnica de Reação em Cadeia da Polimerase associada à Eletroforese em Gel com Gradiente Desnaturante (PCR-DGGE). A aplicação da ametrina alterou a estrutura da comunidade microbiana em ambos os solos, sendo essa alteração mais evidente no solo NVef, principalmente nos períodos inicias da incubação. Os dados de seqüenciamento evidenciaram o predomínio dos seguintes filos: Proteobacteria, Acidobacteria, Actinobacteria e Bacteroidetes. Houve seleção de alguns filos no solo NVef mesmo com apenas 7 dias de incubação da ametrina; entretanto, não houve redução no número de filos no solo RQo. Isto permitiu concluir que a diversidade da população microbiana pode variar com a aplicação do herbicida ametrina, mas isto dependerá principalmente do tipo de solo.

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Sorção-dessorção do fungicida clorotalonil em solos com diferentes teores de matéria orgânica

Cited by 10 publications

References 20 publications

Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

An assessment of potential pesticide transmission, considering the combined impact of soil texture and pesticide properties: A meta‐analysis

Comportamento ambiental da ametrina e suas influências sobre a diversidade da comunidade microbiana dos solos

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