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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Electronic Soil Moisture Measurements in Federal Insecticide, Fungicide, and Rodenticide Act Field Dissipation and Prospective Groundwater Studies
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Electronic Soil Moisture Measurements in Federal Insecticide, Fungicide, and Rodenticide Act Field Dissipation and Prospective Groundwater Studies

机译：联邦杀虫剂，杀菌剂和杀鼠剂法耗散场中的电子土壤水分测量以及预期的地下水研究

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摘要

The draft United States Environmental Protection Agency (USEPA) guidelines for Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Terrestrial Field Dissipation and Prospective Ground-Water (PGW) studies have soil-moisture monitoring requirements. The measurement methodology, frequency, and locations are at the discretion of the registrant. Time Domain Reflectometry (TDR) was used to monitor soil moisture at two PGW study sites, conducted to fulfill part of the registration requirements for a soybean herbicide in the United States. Measurements of soil moisture were continuous from the soil surface to a 3.6-m depth, close to the water table, and recorded hourly. A bromide tracer was applied and transport monitored through the laboratory analysis of soil and soil pore-water samples. A calibrated model of the system hydrology was developed and used to predict vadose zone leaching, ground-water recharge, and tracer movement. Model predictions were compared with field observations. The water and tracer movement predictions, made possible with intensive monitoring, contribute to the understanding of test system dynamics for both dissipation and PGW studies and provide valuable insight to the field conditions between the discrete sampling events.
机译：美国环境保护局（USEPA）的《联邦杀虫剂，杀菌剂和灭鼠剂法》（FIFRA）陆上场消散和预期地下水（PGW）研究指南均具有土壤水分监测要求。测量方法，频率和位置由注册人决定。时域反射仪（TDR）用于监测两个PGW研究地点的土壤湿度，以满足美国大豆除草剂的部分注册要求。从土壤表面到3.6 m深度（靠近地下水位）连续测量土壤湿度，并每小时记录一次。应用了一种溴化物示踪剂，并通过对土壤和土壤孔隙水样品的实验室分析来监测运输情况。开发了系统水文学的校准模型，并将其用于预测渗流带浸出，地下水补给和示踪剂运动。将模型预测与现场观察进行了比较。对水和示踪剂运动的预测（通过密集监视实现）有助于对耗散和PGW研究的测试系统动力学的理解，并为离散采样事件之间的现场条件提供有价值的见解。

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