土壤深度对己嗪酮吸附和解吸过程的影响

IF 0.8 Q3 Agricultural and Biological Sciences Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100016
G. M. Chitolina, K. F. Mendes, C. S. Almeida, F. Alonso, L. Junqueira, V. L. Tornisielo
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引用次数: 1

摘要

摘要:具有高浸出能力的除草剂,如己嗪酮,往往更容易深入土壤深层,其残留影响其在土壤溶液中的有效性。因此,了解己嗪酮在不同土壤深度下的行为是很重要的。本研究的目的是评价己嗪酮在整个土壤剖面上的吸附和解吸。采用平衡批法评价了14c -己嗪酮[三嗪-6- 14c]在3个土壤深度(0-10、10-20和20-30 cm)上的吸附和解吸过程,并采用液体闪烁光谱法测定了该除草剂的放射性。在甲醇溶剂中使用五种不同浓度的己嗪酮(0.12、0.19、0.25、0.31和0.38µg mL-1)。根据线性模型、Freundlich模型和Langmuir模型,利用等温线对平衡态和土壤吸收的除草剂浓度进行了调整。在0-10、10-20和20-30 cm土壤深度,已吸附的Hexazinone Freundlich系数(Kf)分别为0.18、0.11和0.08 g (1-1/n) L1/n kg-1(被吸附的50.49、47.58和46.37%),Freundlich系数(Kf)分别为7.96、7.93和9.82 g (1-1/n) L1/n kg-1(被解吸的26.17、26.58和28.68%)。土壤深度之间有机碳含量的微小差异足以影响己嗪酮的保留率,干扰该产品在土壤溶液中的生物利用度。
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Influence of Soil Depth on Sorption and Desorption Processes of Hexazinone
ABSTRACT: Herbicides with a high leaching capacity, such as hexazinone, tend to reach deeper soils more easily, where retention of the product affects its availability in the soil solution. Therefore, it is important to understand the behavior of hexazinone at a variety of soil depths. The objective of this research was to evaluate the sorption and desorption of hexazinone throughout the soil profile. The sorption and desorption processes of 14C-hexazinone [triazine-6-14C] at three soil depths (0-10, 10-20, and 20-30 cm) were evaluated by the equilibrium batch method, and the radioactivity of the herbicide was quantified by liquid scintillation spectrometry. Five different concentrations of hexazinone (0.12, 0.19, 0.25, 0.31, and 0.38 µg mL-1) in a methanol solvent were used. The concentrations of the herbicide in equilibrium and sorbed in the soil were adjusted by using isotherms according to the Linear, Freundlich, and Langmuir models. Hexazinone sorption at soil depths of 0-10, 10-20, and 20-30 cm showed decreasing Freundlich coefficients (Kf) with values of 0.18, 0.11, and 0.08 g (1-1/n) L1/n kg-1 (50.49, 47.58, and 46.37% sorbed), and in the desorption the Kf were 7.96, 7.93, and 9.82 g (1-1/n) L1/n kg-1 (26.17, 26.58, and 28.68% desorbed), respectively. The small difference in organic carbon content between soil depths was sufficient to affect hexazinone retention, interfering with the bioavailability of this product in the soil solution for weed control.
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来源期刊
Planta Daninha
Planta Daninha Agricultural and Biological Sciences-Plant Science
自引率
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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.
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