TY - JOUR
T1 - Substâncias húmicas e sua relação com a sorção de pesticidas em oito solos vulcânicos
AU - Alister, C.
AU - Araya, M.
AU - CORDOVA SUAREZ, ANDRES IGNACIO
AU - SAAVEDRA TORRICO, JORGE ANDRES
AU - Kogan, M.
N1 - Publisher Copyright:
© 2020, Sociedade Brasileira da Ciencia das Plantas Daninha. All rights reserved.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Adsorption
KW - Desorption
KW - Freundlich
KW - Isotherms
UR - http://www.scopus.com/inward/record.url?scp=85084841721&partnerID=8YFLogxK
U2 - 10.1590/S0100-83582020380100021
DO - 10.1590/S0100-83582020380100021
M3 - Article
AN - SCOPUS:85084841721
VL - 38
JO - Planta Daninha
JF - Planta Daninha
SN - 0100-8358
M1 - e020171636
ER -