烯啶虫胺在热带土壤中吸附解吸特征研究

为了解烯啶虫胺在热带地区风化程度较高的酸性土壤中的环境行为,根据《化学农药环境安全评价试验准则》中土壤吸附试验规定,采用振荡平衡法,研究了烯啶虫胺在3种不同热带土壤上的吸附特性。结果表明,烯啶虫胺在3种热带土壤上的吸附过程能用Freundlich方程和Langmuir方程进行较好的拟合,且吸附行为存在较大的差异,其Kf值分别为水稻土1.530 L/kg,铁质湿润雏形土3.153 L/kg,暗红湿润铁铝土2.724 L/kg。烯啶虫胺在3种热带土壤上的吸附属于难吸附等级,解吸较为容易,易在热带土壤中移动,在施用的过程中容易造成地下水污染。此外,烯啶虫胺在3种热带土壤上的吸附主要是分配作用,且吸附...

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Published in广东农业科学 Vol. 41; no. 9; pp. 189 - 192
Main Author 陈珊珊 陈淼 武春媛 邓晓 刘景坤 李勤奋
Format Journal Article
LanguageChinese
Published 中国热带农业科学院环境与植物保护研究所,海南海口571101%中国热带农业科学院环境与植物保护研究所,海南海口571101 2014
农业部儋州农业环境科学观测实验站,海南儋州571737
海南大学环境与植物保护学院,海南海口570228
Subjects
吸附解吸
热带土壤
烯啶虫胺
吸附解吸
烯啶虫胺
热带土壤
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ISSN1004-874X

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Summary:为了解烯啶虫胺在热带地区风化程度较高的酸性土壤中的环境行为,根据《化学农药环境安全评价试验准则》中土壤吸附试验规定,采用振荡平衡法,研究了烯啶虫胺在3种不同热带土壤上的吸附特性。结果表明,烯啶虫胺在3种热带土壤上的吸附过程能用Freundlich方程和Langmuir方程进行较好的拟合,且吸附行为存在较大的差异,其Kf值分别为水稻土1.530 L/kg,铁质湿润雏形土3.153 L/kg,暗红湿润铁铝土2.724 L/kg。烯啶虫胺在3种热带土壤上的吸附属于难吸附等级,解吸较为容易,易在热带土壤中移动,在施用的过程中容易造成地下水污染。此外,烯啶虫胺在3种热带土壤上的吸附主要是分配作用,且吸附自由能ΔG均小于40 kJ/mol,属于物理吸附过程。
Bibliography:44-1267/S
In order to understand the environmental behavior of nitenpyram in acid soil with higher degree of weathering in tropical areas, according to ＂experimental guideline for environmental safety evaluation of chemical pesticides＂, this paper analyzed the adsorption processes of Nitenpyram in three types of tropical soil by batch equilibration technique. Results showed that the adsorption isotherms of Nitenpyram in three types of tropical soil could be described well by Freundlich and Langmuir equations. Adsorption behavior of Nitenpyram varied in different types of tropical soil：adsorption coefficient（Kf） of nitenpyram in paddy soil, ferric-udic cambosols and udic ferralisols was 1.530, 93.153 and2.724 L/kg, respectively. Nitenpyram was hard to be adsorbed in these soils but was easy to desorb. Adsorption free energy（ΔG） of nitenpyram in three types of tropical soil was lower than 40 kJ/mol, showing that the partition was predominant and the adsorption process relied mainly on physical adsorption.
Nitenpy
ISSN:1004-874X