Imazaquin sorption in surface and subsurface soil samples

Oliveira, Maurílio Fernandes de; Prates, H. T.; Santanna, Derli Prudente; Júnior, Rubem Silvério de Oliveira

doi:10.1590/s0100-204x2006000300013

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…This was attributed to the presence of the herbicide in its anionic form ( Figure S1) at the pH of the tested soils (pH > 8). The negative charge of the herbicide would be repelled by soil colloidal particles, which are also negatively charged at alkaline pH levels (Lee et al, 1990;Oliveira et al, 2006;Rocha et al, 2002). Other soil properties that may have contributed to the lack of sorption of imazaquin on the soils are their low organic matter and iron oxides contents (Regitano et al, 1997;Rocha et al, 2002).…”

Section: Sorption Of Imazaquin Enantiomers By the Unamended And Amendmentioning

confidence: 99%

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

et al. 2017

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Sorption, persistence, and leaching of the enantiomers of the herbicide imazaquin, S-imazaquin and R-imazaquin, in two soils under different application regimes were studied. Imazaquin dissipation was evaluated after a single application of the racemic herbicide and the pure enantiomers, and after a repeated application of the racemic herbicide. The effects of adding two olive-mill wastes (ALP and ALPc), biochar (BC), and organoclay (SA-HDTMA) on sorption, dissipation, and leaching of imazaquin enantiomers applied as racemic herbicide to the soils was also evaluated. For all treatments, sorption, dissipation, and leaching of imazaquin in the soils were either non-enantioselective or scarcely enantioselective. No interconversion of Rimazaquin to S-imazaquin or vice-versa was observed in the experiments with the pure isomers. Addition of ALP, ALPc, or BC did not enhance the negligible sorption of imazaquin enantiomers by the soils, but accelerated their dissipation. Addition of SA-HDTMA increased sorption of both enantiomers and delayed their dissipation and leaching. The results illustrate how agricultural practices can impact the behavior of imazaquin enantiomers in soils and support the suitability of replacing currently used racemic formulations of imazaquin with formulations based on the single biologically-active (R) enantiomer to reduce the environmental impact of this chiral pesticide.

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Section: Sorption Of Imazaquin Enantiomers By the Unamended And Amendmentioning

confidence: 99%

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

et al. 2017

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“…Several other publications confirm the dependence of sorption on both organic matter and clays (16)(17)(18)(19)(20). Since the reviews, evidence of hydrophobicity and cation exchange effects on sorption has been published (21)(22)(23)(24). This literature defines the conventional state of the art as of 2001.…”

Section: Introductionmentioning

confidence: 99%

Herbicide Sorption by Immersed Soils: Stoichiometry and the Law of Mass Action in Support of Predictive Kinetics

Gamble

2009

Environ. Sci. Technol.

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The stoichiometry of labile herbicide sorption on immersed soils has been determined for a few herbicides and a number of soils (Gamble, D. S.; Khan, S. U. Atrazine in organic soil: Chemical speciation during heterogeneous catalysis. J. Agric. Food Chem. 1990, 38, 297-308; Gamble, D. S.; Ismaily, L. A. Atrazine in mineral soil: The analytical chemistry of speciation. Can. J. Chem. 1992, 70, 1590-1596; Gamble, D. S.; Khan, S. U. Atrazine in mineral soil: Chemical species and catalysed hydrolysis. Can. J. Chem. 1992, 70, 1597-1603; Gilchrist, G. F. R.; Gamble, D. S.; Khan, S. U. Atrazine interactions with clay minerals: Kinetics and equilibria of sorption. J. Agric. Food Chem. 1993, 41, 1748-1755; Gamble, D. S. Physical chemistry parameters that control pesticide persistence and leaching in watershed soils. Final report submitted to the Great Lakes Water Quality Program Committee, Guelph, Ontario, June, 1994; Li, J.; Langford, C. H.; Gamble, D. S. Atrazine sorption by a mineral soil: Processes of labile and nonlabile uptake. J. Agric. Food Chem. 1996, 44, 3672-3679; Li, J.; Langford, C. H.; Gamble, D. S. Atrazine sorption by a mineral soil: The effects of size fractions and temperature. J. Agric. Food Chem. 1996, 44, 3680-3684; Gamble, D. S. Pesticide-soil research for the behaviour of chlorothalonil and its metabolite SD-3701 in soil. Final report submitted to Ricerca Inc., Sept 15, 1998; Gamble, D. S. Atrazine sorption kinetics in a characterized soil: Predictive calculations. Environ. Sci. Technol. 2008, 42, 1537-1541). This was done by using equilibrium titrations forthe measurement of labile sorption capacities thetaC. The titrations were made possible by resolving total sorption into its labile and unrecovered fractions. But equilibrium was not also necessary for unrecovered fractions. The site saturation at titration plateaus defined thetaC. The first purpose of determining the stoichiometry is to permitthe use of second-order kinetics instead of unpredictive pseudo-first-order kinetics for sorption modeling. Another purpose is to replace empirical distribution coefficients such as K(D) with the law of mass action for describing equilibria as limiting states. Temperature trends and a comparison with EGME vapor deposition data from the literature indicate a control of herbicide sorption by sorbed water. A preliminary examination of limited data from different sources suggests that future research should investigate some additional correlations. ThetaC and equilibrium functions might both be influenced by soil organic matter carboxyls and carboxylate anions, as well as inorganic materials. Some disadvantages of K(D) are noted.

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“…Por fim, é importante salientar que uma parte considerável dos artigos foi considerada "indeterminada", porque, ainda que tenha se apropriado do termo sustentabilidade, não foi possível encontrar elementos que pudessem sugerir afinidades relevantes com quaisquer concepções de sustentabilidade construídas. É o caso, por exemplo, de artigos como de Oliveira (2006) e Romanelli e Milan (2005), que só utilizaram o termo como palavra-chave sem desenvolver ideias relativas à questão no corpo do texto. Nesse sentido, é possível que o termo sustentabilidade seja também utilizado como estratégia de inserção em algumas discussões.…”

Section: Análise De Conteúdounclassified

Esboços de uma sociologia do conhecimento da questão ambiental

Kanashiro¹

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À minha orientadora, professora Leila da Costa Ferreira, pelas sugestões, críticas e estímulos, essenciais tanto para o desenvolvimento desta dissertação, quanto para o aprendizado intelectual, tão importante neste momento da vida acadêmica.À FAPESP, pela bolsa de mestrado e apoio financeiro, fundamentais para a condução desta pesquisa.Ao Programa de Pós-graduação em Sociologia e à Unicamp, pela excelente estrutura disponibilizada.Aos funcionários do IFCH e do NEPAM, especialmente Christina Faccioni, pela dedicação e leveza com que conduz o trabalho na secretaria de pós-graduação, e Sueli Almeida Cipriano, pelas palavras sempre de incentivo, já no fim do expediente, na saída da biblioteca.Aos professores Renato Ortiz e Léa Velho, pelas críticas e comentários valiosíssimos no exame de qualificação e pelo exemplo de vida intelectual.Aos professores Élide Rugai Bastos, do Departamento de Sociologia, e Ademar Ribeiro Romeiro, do Departamento de Economia, cujas aulas brilhantes tive o privilégio de assistir durante esta passagem no mestrado.À professora Gilda Figueiredo Portugal Gouveia e à turma de seminário de dissertação de 2008, pelos comentários e troca de ideias tão profícuos.Ao pessoal do grupo de estudos da professora Leila: Estevão, Marília, Marcelo, Carol, Roberto, Lino, Fabi e Luziana.Ao Allan, pela ajuda, oportuna, com os gráficos e tabelas desta dissertação.

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Imazaquin sorption in surface and subsurface soil samples

Cited by 8 publications

References 19 publications

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

Herbicide Sorption by Immersed Soils: Stoichiometry and the Law of Mass Action in Support of Predictive Kinetics

Esboços de uma sociologia do conhecimento da questão ambiental

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