Watts D W, Novak J M, Johnson M H, Stone K C
USDA-ARS-Coastal Plains Soil, Water, and Plant Research Center, Florence, SC 29501, USA.
J Environ Sci Health B. 2000 Mar;35(2):175-86. doi: 10.1080/03601230009373262.
During an 18-month (1994-1995) survey of the surface water in an Atlantic Coastal Plain watershed, metolachlor was most frequently detected during storm flow events. Therefore, a sampling procedure, focused on storm flow, was implemented in June of 1996. During 1996, three tropical cyclones made landfall within 150 km of the watershed. These storms, as well as several summer thunderstorms, produced six distinct storm flow events within the watershed. Metolachlor was detected leaving the watershed during each event. In early September, Hurricane Fran produced the largest storm flow event and accounted for the majority of the metolachlor exports. During the storm event triggered by Hurricane Fran, the highest daily average flow (7.5 m2 s-1) and highest concentration (5.1 micrograms L-1) ever measured at the watershed outlet were recorded. Storm flow exports leaving the watershed represented 0.1 g ha-1 or about 0.04% of active ingredient applied.
在对大西洋沿岸平原一个流域的地表水进行为期18个月（1994 - 1995年）的调查期间，异丙甲草胺在暴雨径流事件中被检测到的频率最高。因此，1996年6月实施了一项针对暴雨径流的采样程序。1996年期间，有三个热带气旋在距该流域150公里范围内登陆。这些风暴以及几场夏季雷暴在流域内产生了六次不同的暴雨径流事件。每次事件中均检测到异丙甲草胺流出该流域。9月初，“弗兰”飓风引发了最大的暴雨径流事件，且异丙甲草胺的输出量占了大部分。在“弗兰”飓风引发的风暴事件期间，记录到了该流域出水口有史以来最高的日平均流量（7.5立方米/秒）和最高浓度（5.1微克/升）。流出该流域的暴雨径流输出量为0.1克/公顷，约占所施用活性成分的0.04%。
