Substâncias húmicas e sua relação com a sorção de pesticidas em oito solos vulcânicos

Translated title of the contribution: Humic substances and their relation to pesticide sorption in eight volcanic soils

Research output: Contribution to journalArticlepeer-review

Abstract

Pesticide soil sorption is a primary factor that influences the fate of pesticides in the environment, affecting regulation of microbiological and chemical degradation, volatilization and leaching. The main goal of this research was to study the effect of the organic phase of volcanic soils on sorption of agricultural pesticides. Sorption and desorption of eight agricultural pesticides were studied on eight volcanic soils that varied in the fulvic and humic constituents of their organic matter. For all pesticides, sorption was well described by a Freundlich isotherm where 1/nads values indicated that the sorption mechanism could be mainly explained by physical reactions in all soils. Kf values for carbaryl and flumioxazin were the highest with average values of 7.78 and 7.16 mL g-1, respectively. By contrast, hexazinone and metsulfuron-methyl had the lowest average Kf: 0.86 and 0.81 mL g-1, respectively, indicating that they were the least attracted to the soils. The organic fraction of the soil was the main soil factor related to the sorption of all study pesticides. Particularly, humic acid content regulated the sorption between pesticide and soil, especially through the carboxylic groups.

Translated title of the contributionHumic substances and their relation to pesticide sorption in eight volcanic soils
Original languagePortuguese
Article numbere020171636
JournalPlanta Daninha
Volume38
DOIs
StatePublished - 2020
Externally publishedYes

Keywords

  • Adsorption
  • Desorption
  • Freundlich
  • Isotherms

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