Sorção, dessorção e potencial de lixiviação de dimethenamid em solos brasileiros

Archangelo, E. R.; Karam, D.; Ferreira, Francisco Affonso; Prates, H. T.; Ferreira, Lino Roberto; Cardoso, Antônio Américo

doi:10.1590/s0100-83582004000300018

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The low values for the extraction of atrazine by supercritical extraction with CO 2 (without ultrasound) may be explained by the adsorption of the atrazine by the relatively high organic‐matter content of our soil samples , . The phenomenon of atrazine desorption depends on the type of soil and on its content of organic matter, with the atrazine desorption decreasing as the amount of organic matter in the soil increases . The soil used in these experiments had 6.16 % organic matter (Tab.…”

Section: Resultsmentioning

confidence: 90%

“…SFE has been receiving a lot of attention as a potential technique for soil remediation . Previous studies of supercritical extraction of atrazine have been carried out ; they showed that the recovery of this compound is influenced by many factors such as soil composition, pesticide concentration in the soil, and percentage of organic matter (the extraction difficulty increases with the increase of organic matter content) . The use of co‐solvents, such as methanol, water, and triethylamine (TEA), has also been studied ; they showed a significant increase in the extraction of atrazine, however, a consensus on the best co‐solvent to be used has yet to be reached .…”

Section: Introductionmentioning

confidence: 99%

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Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

et al. 2017

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The coupling of ultrasound to supercritical extraction with carbon dioxide has been evaluated as a green remediation technique for soils contaminated with pesticides. The study used samples of soil spiked with atrazine, an organophosphate and contaminant of widespread use. The influence of the operating temperature and pressure on the extraction of atrazine was studied. The extraction of atrazine was enhanced with the use of ultrasound relative to the results obtained from conventional supercritical extraction. This study, operated in semi-continuous mode, demonstrates the possibility of increasing the yield of supercritical extraction by coupling with ultrasound instead of adding co-solvents, which is a greener alternative for removing contaminants such as pesticides from soil matrices.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

et al. 2017

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“…This result indicates that soil with organic matter from SWW has greater sorption capacity. Other authors have observed this behavior with chloroacetamide pesticides and with different methods of adding organic carbon to soil (ARCHANGELO et al, 2004). According to Torrents et al (1997), chloroacetamide herbicides may be adsorbed by organic matter due to charge transfer, due to Van der Waals forces involving the aromatic moiety, and/or due to hydrogen bonds between carboxyl or hydroxyl groups on the surface of the organic matter and the carbonyl oxygen of the amide group of the herbicide.…”

Section: Resultsmentioning

confidence: 95%

“…The results of the adsorption and desorption assay are presented in Freundlich isotherms (Equation 2) (ARCHANGELO et al, 2004) as:…”

Section: Adsorption and Desorption Assaymentioning

confidence: 99%

<b>The influence of organic matter from swine wastewater on the interaction and transport of alachlor in soil</b> - doi: 10.4025/actasciagron.v35i3.16374

et al. 2013

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ABSTRACT. This study evaluated the effects of total and dissolved organic matter produced from two swine wastewater treatment systems, a biodigester and a manure lagoon, on the adsorption, desorption, and leaching of alachlor (2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide) in soil. It was used the batch equilibrium method to test adsorption and desorption, and the results are presented in Freundlich isotherms. It also used disturbed soil columns to evaluate the miscible displacement of alachlor in soil treated with total and dissolved organic matter. This assay was used to monitor the concentration of alachlor in the leached material, the amount of total organic carbon, and the pH. The addition of swine wastewater promoted greater adsorption and desorption of alachlor compared with the control. The dissolved organic matter promoted less soil adsorption of alachlor compared with the total organic matter and also interacted with the alachlor and/or competed with the exchangeable cation sites in the soil, resulting in greater leaching. The total organic matter contributed to the emergence of new sorption sites in the soil column, and the solids present in the composition may have blocked pesticide passage, resulting in lower loss of alachlor due to leaching.Keywords: adsorption, hydro-dispersive parameters, infrared spectroscopy, leaching, pesticide.Influência da matéria orgânica proveniente de água residuária de suinocultura na interação e transporte do alaclor no solo RESUMO. Este trabalho avaliou o efeito da aplicação de matéria orgânica total e dissolvida proveniente de dois sistemas de tratamento de água residuária de suinocultura, biodigestor e esterqueira, na adsorção, dessorção e lixiviação de alaclor (2-cloro-2,6-dietil-N(metoximetil acetamida)) no solo. O método do equilíbrio foi utilizado para o teste de adsorção e dessorção e os resultados foram apresentados em isotermas de Freundlich. Utilizou-se também colunas de solo deformado para avaliar o deslocamento miscível do alaclor no solo tratado com matéria orgânica total e dissolvida. Este ensaio foi realizado para monitorar a concentração de alaclor no lixiviado, o teor de carbono orgânico total e o pH. A adição de água residuária de suinocultura promoveu maior adsorção e dessorção do alaclor comparado ao controle. A matéria orgânica dissolvida promoveu menor adsorção de alaclor ao solo comparada à total e também interagiu com o alaclor e/ou competiu com os sítios sortivos do solo, resultando em maior lixiviação. A matéria orgânica total contribuiu com o surgimento de novos sítios de sorção na coluna de solo e os sólidos presentes em sua composição podem ter bloqueado a passagem do pesticida, resultando em menores perdas de alaclor por lixiviação.Palavras-chave: adsorção, parâmetros hidrodispersivos, espectroscopia infravermelha, lixiviação, pesticida.

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“…Based on the values of Ce and Cs Freundlich equation usage was made (Cs = K f Ce 1/n ) to obtain adsorption coefficients where K f and 1/n are empirical constants that represent the sorption capacity and intensity, respectively, and regression parameters characteristic for each soil-herbicide system (Farmer & Aochi, 1974;Hang et al, 1996;Vieira, 1999;Archangelo et al, 2004). The K d coefficient was also calculated and represents the relation between the concentration of herbicide that remains sorbed in the Cs (µg g -1 ) soil and the one found in the equilibration Ce (µg mL -1 ) soil solution, for a specific quantity of added herbicide (Silva & Silva, 2007).…”

Section: Methodsmentioning

confidence: 99%

Sorption and desorption of picloram in soils under pastures in Brazil

Assis¹,

Silva

Barbosa³

et al. 2011

Planta daninha

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-The objective of this work was to determine the coefficients of sorption and desorption of picloram in Ultisol (PVA) and Oxisol (LVA), displaying different physical and chemical characteristics. Samples of soil were collected at the 0 20 cm depth in degraded pasture areas in Viçosa-MG. Firstly, the equilibrium time between the herbicide in solution and the herbicide which was sorbed in the soil was determined by the Batch Equilibrium method. The time required was 24 hours. Sorption and desorption studies were carried out under controlled laboratory conditions; the sorption evaluation consisted in adding 10.0 mL of herbicide solutions at different concentrations to tubes containing 2.00 g of soil, with vertical rotary agitation being maintained during the pre-determined equilibrium time. After centrifugation, supernatant extract cleaning and filtration, herbicide concentration was determined by high performance liquid chromatography (HPLC) with UV detection at 254 nm. Desorption was evaluated using the samples in the tubes after the sorption tests. The Freundlich model was used for interpretation of the sorption process. Ultisol showed higher adsorption coefficient (Kf a ) compared with Oxisol, which may be attributed to the lower pH of the soil and its higher organic matter content. Desorption process occurred in both soils; the LVA allowed greater release of the previously sorbed molecules.Keywords: herbicide, batch equilibrium, Freundlich isotherms, HPLC.RESUMO -Objetivou-se com este trabalho determinar os coeficientes de sorção e dessorção do picloram em Argissolo Vermelho-Amarelo (PVA) e Latossolo Vermelho-Amarelo (LVA) com diferentes características físico-químicas. As amostras desses solos foram coletadas na profundidade de 0 -20 cm em áreas de pastagens degradadas, na região de Viçosa, MG. Primeiramente, determinou-se o tempo de equilíbrio entre o herbicida em solução e aquele que ficou sorvido no solo, por meio do método "Batch Equilibrium". O tempo necessário foi 24 h. Os estudos de sorção e dessorção foram realizados sob condições laboratoriais controladas; a avaliação da sorção consistiu em adicionar 10,0 mL de solução do herbicida com diferentes concentrações em tubos contendo 2,00 g de solo, permanecendo sob agitação rotatória vertical pelo tempo de equilíbrio predeterminado. Após centrifugação, limpeza do extrato sobrenadante e filtração, a concentração do herbicida foi determinada por cromatografia líquida de alta eficiência (CLAE), com detector UV a 254 nm. A dessorção foi avaliada utilizando as amostras contidas nos tubos, após os ensaios de sorção. O modelo de Freundlich foi utilizado para a interpretação do processo sortivo. O Argissolo Vermelho-Amarelo apresentou maior coeficiente de sorção (Kf a ) quando comparado com o Latossolo Vermelho-Amarelo, o que pode ser atribuído ao menor pH deste solo e ao seu maior teor de matéria orgânica. O processo de dessorção ocorreu em ambos os solos; o LVA permitiu maior liberação das moléculas anteriormente sorvidas.Palavras-chave: herbicida, bat...

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Sorção, dessorção e potencial de lixiviação de dimethenamid em solos brasileiros

Abstract: RESUMO -Determinar a sorção, a dessorção e o potencial de lixiviação do dimethenamid em diferentes solos foi o objetivo deste trabalho. As amostras dos solos foram agitadas por 24 horas e centrifugadas, sendo o sobrenadante filtrado e analisado por HPLC.

Cited by 8 publications

References 14 publications

Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

<b>The influence of organic matter from swine wastewater on the interaction and transport of alachlor in soil</b> - doi: 10.4025/actasciagron.v35i3.16374

Sorption and desorption of picloram in soils under pastures in Brazil

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