期刊
CHEMOSPHERE
卷 58, 期 6, 页码 693-703出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2004.09.105
关键词
herbicides; Canadian Prairies; residues; atmospheric concentrations; dry deposition; deposition velocity
High volume air sampling in the Canadian Prairies was used to characterize atmospheric concentrations for 10 herbicides (alachlor. atrazine. ethalfluralin. metolachlor. 2,4-D. dicamba. bromoxynil. MCPA. trifluralin. and triallate) along a 500-km north-south transect. Atmospheric concentration measurements at various altitudes identified that of the six herbicides present in the highest concentrations. triallate was strongly influenced by local sources. while 2,4-D, dicamba, bromoxynil, MCPA and trifluralin were dominated by regional atmospheric transport. Concentrations of the herbicides measured at various altitudes were compared with dry deposition rates measured using a dry/wet deposition sampler and used to calculate deposition velocities V-d. The primary atmospheric transport mechanism for MCPA and bromoxynil was shown to be adsorption to particles dispersed in the atmosphere. with the same mechanism also confirmed for 2,4-D and dicamba. while trifluralin was shown to be transported mainly in the gas phase. This method of calculation indicated that transportation of triallate was influenced by particle adsorption. Weekly maximum atmospheric loadings of the major herbicides present in the Prairies Acre estimated to range from 73kg for trifluralin to 541 kg for 2,4-D. Crown Copyright (C) 2004 Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据