C. Alister, M. Araya, A. Cordova, J. Saavedra, M. Kogan
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引用次数: 5
摘要
摘要:农药在土壤中的吸附作用是影响农药在环境中命运的主要因素,影响农药在土壤中的微生物和化学降解、挥发和淋滤的调控。本研究的主要目的是研究火山土有机相对农业农药吸附的影响。研究了8种不同有机质腐殖质和腐殖质成分的火山土对8种农药的吸附和解吸作用。Freundlich等温线很好地描述了所有农药的吸附,其中1/nads值表明,所有土壤中的吸附机制主要可以用物理反应来解释。西威因和氟恶嗪的Kf值最高,平均值分别为7.78和7.16 mL g-1。而己嗪酮和甲磺隆-甲基的平均Kf最低,分别为0.86和0.81 mL g-1,表明它们对土壤的吸引力最小。土壤有机组分是影响农药吸附的主要土壤因子。特别是腐植酸含量调节了农药与土壤之间的吸附,特别是通过羧基。
Humic Substances and their Relation to Pesticide Sorption in Eight Volcanic Soils
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.
Planta DaninhaAgricultural and Biological Sciences-Plant Science
自引率
0.00%
发文量
0
审稿时长
16 weeks
期刊介绍:
Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.