Transport of 3,5,6-trichloro-2-pyrdionl (a main pesticide degradation product) in purple soil: Experimental and modeling

doi:10.1016/j.apgeochem.2017.07.010

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Transport of 3,5,6-trichloro-2-pyrdionl (a main pesticide degradation product) in purple soil: Experimental and modeling
	Lei Wenjuan 2,3; Tang Xiangyu 2; Zhou Xiangyang 1
	2018
会议日期	AUG 14-20, 2016
会议地点	Galway
关键词	3,5,6-Trichloro-2-pyridinol Purple soil Transport Two-region model
卷号	88
DOI	10.1016/j.apgeochem.2017.07.010
页码	179-187
国家	IRELAND
英文摘要	Purple soil, a loamy entisol dominating the hilly central Sichuan basin in the upper reaches of Yangtze River, is low in organic matter content and abundant in macropores that form the rapid transport network for water and solutes including pesticides. However, effects of soil's macroporosity on transport of pesticides has not been quantitatively explored and simulated at the column scale. In this study, we explore the transport of 3,5,6-trichloro-2-pyrdionl (TCP), a main pesticide degradation product, in purple soil through experiments and simulations on typical farmland categories, including rice-rape and vegetable farmland. Soil water retention characteristics (SWRCs) and physical properties are measured to learn the hydraulic parameters and porous structures of the soil. Batch experiments are conducted to obtain the adsorption coefficient of TCP on soil, and breakthrough curves of Br- (a conservative tracer) in undisturbed soil columns are applied to evaluate the hydrodynamics of TCP transport. The two-region model is used to simulate the transport processes, and the parameters are obtained by inversion simulation. It is found that TCP transport in purple soil exhibited complex patterns and is strongly affected by both chemical and physical non-equilibrium. A higher pollution risk on water body of rice-rape field is due to the stronger preferential flow and better pore connectivity despite the larger macroporosity observed in vegetable field. These results can provide useful data and modeling approach for evaluating the risk of pesticide leaching toward groundwater. (C) 2017 Elsevier Ltd. All rights reserved.
产权排序	2
会议录	APPLIED GEOCHEMISTRY
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD
会议录出版地	OXFORD
语种	英语
ISSN号	0883-2927
WOS记录号	WOS:000424846900006
内容类型	会议论文
源URL	[http://ir.imde.ac.cn/handle/131551/35215]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Tang Xiangyu
作者单位	1.College of Water Resource & Hydropower, University of Sichuan, Chengdu 610065, China 2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 3.College of Architecture & Environment, University of Sichuan, Chengdu 610065, China;
推荐引用方式 GB/T 7714	Lei Wenjuan,Tang Xiangyu,Zhou Xiangyang. Transport of 3,5,6-trichloro-2-pyrdionl (a main pesticide degradation product) in purple soil: Experimental and modeling[C]. 见:. Galway. AUG 14-20, 2016.