Description of Simazine Transport with Rate‐Limited, Two‐Stage, Linear and Nonlinear Sorption
Description of Simazine Transport with Rate‐Limited, Two‐Stage, Linear and Nonlinear Sorption
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限速、两级、线性和非线性吸附西玛嗪传输的描述
DOI：
10.1029/94wr02822
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发表时间：
1995
影响因子：
5.4
通讯作者：
W. J. Farmer
中科院分区：
文献类型：
--
作者：
T. Streck;N. Poletika;W. Jury;W. J. Farmer
本研究旨在解决西玛津实验室吸附等温线数据与Poletika等人（本期）报告的田间蒸渗仪传输实验之间的明显不一致。在这项调查中，线性和非线性的一级和两级西玛津吸附模型进行了拟合的吸附和解吸等温线的实验室数据，以获得参数估计用于运输模型。一旦获得，校准的吸附模型与参数化的流出物浓度记录从移动的溴示踪剂相结合，以代表速率限制的吸附和运输的西玛津同时加入溴。校准模型做了出色的工作，代表最终西玛津在土壤中的配置文件，特别是与非线性模型。这与Poletika等人（本期）测试的单级吸附模型形成对比，当使用实验室测量的吸附参数时，该模型与现场概况的一致性较差。结果表明，农药运动的现场和实验室实验的兼容性，也表明，吸附等温线可能需要更长的时间才能达到平衡比通常允许在目前的协议。
This study was conducted to reconcile an apparent inconsistency between the simazine laboratory sorption isotherm data and the field lysimeter transport experiment reported by Poletika et al. (this issue). In this investigation, linear and nonlinear one- and two-stage simazine sorption models were fitted to the sorption and desorption isotherm laboratory data to obtain parameter estimates for use in the transport model. Once obtained, the calibrated sorption model was combined with the parameterized outflow concentration record from a mobile Br tracer to represent rate-limited sorption and transport of the simazine added simultaneously with the Br. The calibrated model did an excellent job of representing the final simazine profile in the soil, particularly with the nonlinear model. This is in contrast to a single-stage adsorption model tested by Poletika et al. (this issue), which reached poor agreement with the field profile when laboratory-measured sorption parameters were used. The results demonstrate the compatibility of field and laboratory experiments on pesticide movement and also indicate that sorption isotherms may require substantially longer to reach equilibrium than is customarily allowed in current protocols.