周艳明,
曲甍甍,
姜辉,
刘学
农业部农药检定所, 北京 100125

作者简介: 周艳明(1981-),男,高级农艺师,研究方向为农药环境风险评估,E-mail:zhouyanming@agri.gov.cn.

基金项目: 2016年农业行业标准制订和修订及农产品质量认证项目


中图分类号: X171.5

Comparison of Evaluation Method of Pesticide Environment Degradation Kinetics Used in EU and NAFTA

Zhou Yanming,
Qu Mengmeng,
Jiang Hui,
Liu Xue
Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing 100125, China

CLC number: X171.5

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摘要:农药在环境中的降解行为是评估农药环境安全性的基础，农药的降解动力学通常以一级动力学模型描述。现有的环境暴露模型也均需要输入一级动力学模型的农药在土壤中50%消失时间(DT₅₀)。但有时一级动力学模型不适用于描述农药在环境中，特别是土壤中的降解。因此欧盟和北美自由贸易区已发布了一系列关于使用非一级动力学模型计算DT₅₀的导则。介绍了欧美降解动力学评估方法，并用多组降解数据比较了2种评估方法的区别。
关键词: 农药/
降解动力学/
非一级动力学模型/
评估方法

Abstract:Degradation of pesticide in the environment is a key factor in pesticide environmental risk assessment, and the degradation kinetics is often described by single first-order kinetics. The currently used exposure models require a first order 50% disappearance time (DT₅₀). However, single first order kinetics may not appropriately describe the pesticide degradation behavior in environment, especially in soil. In these cases, European Union (EU) and North American Free Trade Area (NAFTA) has developed a series of guidance documents including the use of non-first order kinetics in fitting pesticide degradation data to determine DT₅₀. This paper presents an introduction of kinetics analysis procedures used by EU and NAFTA, and a comparison of the two approaches using various data sets.
Key words:pesticide/
degradation kinetics/
non first order model/
evaluation method.