Gimsing Anne Louise, Borggaard Ole K, Sestoft Peter
The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.
Environ Sci Technol. 2004 Mar 15;38(6):1718-22. doi: 10.1021/es030572u.
The herbicide glyphosate and inorganic phosphate compete for adsorption sites in soil and on oxides. This competition may have consequences for the transport of both compounds in soil and hence for the contamination of groundwater. We present and evaluate six simple, kinetic models that only take time and concentrations into account. Three of the models were found suitable to describe the competition in soil. These three models all assumed both competitive and additive adsorption, but with different equations used to describe the adsorption. For the oxides, three additional models assuming only competitive adsorption were also found suitable. This is in accordance with the observation that the adsorption in soil is both competitive and additive, whereas the adsorption on oxides is competitive. All models can be incorporated in transport models such as the convection-dispersion equation.
除草剂草甘膦和无机磷酸盐会竞争土壤及氧化物表面的吸附位点。这种竞争可能会对这两种化合物在土壤中的迁移产生影响，进而影响地下水的污染情况。我们提出并评估了六个仅考虑时间和浓度因素的简单动力学模型。结果发现其中三个模型适用于描述土壤中的竞争情况。这三个模型均假定存在竞争性吸附和加和性吸附，但用于描述吸附的方程有所不同。对于氧化物，还发现另外三个仅假定存在竞争性吸附的模型是适用的。这与土壤吸附兼具竞争性和加和性而氧化物吸附仅具竞争性这一观察结果相符。所有模型均可纳入诸如对流 - 弥散方程等迁移模型中。
