Effect of Iron Oxide on the Desorption Characteristics of Atrazine in Soil
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摘要: 阿特拉津是一种典型的环境激素, 铁氧化物是土壤矿物质的主要成分之一, 研究铁氧化物对阿特拉津的吸附行为有助于深入了解环境激素在环境中的行为.在研究阿特拉津的污染土壤与铁氧化物的混合物对阿特拉津吸附与解吸作用机理的基础上, 通过采用不同配比的土壤与铁氧化物的混合物对农药阿特拉津进行解吸行为过程的模拟, 并改变解吸时间、温度、pH值等因素, 研究影响解吸行为的主要因素.结果表明: 温度、pH值、铁氧化物与土壤的不同配比等因素均会对阿特拉津的解吸作用产生不同程度的影响.混合物对阿特拉津的解吸一般在4h左右便可达到动态平衡, 酸性或碱性环境以及适当的温度条件均会在一定程度上增强解吸作用, 且发现混合物比原土壤的解吸效果更明显.Abstract: Atrazine is a typical environmental hormone and iron oxide which is one of the major components in the soil minerals. Studying of iron oxide on the adsorption behavior of atrazine facilitates the understanding of acts of environmental hormones in the environment. In this paper, the effects of the atrazine polluted soil and mixture of iron oxides on the adsorption and desorption of atrazine is studied, and three different ratios of soil and a mixture of iron oxides on the atrazine desorption are investigated. In addition, the main factors are found by means of changing factors such as desorption time, temperature, and pH value. Results show that temperature, pH, ratio of iron oxides and soil all affect the desorption in different degrees. Dynamic equilibrium of the effect of the mixture on the desorption could be achieved in about 4 hours generally. Acid or alkaline environment and the appropriate temperature enhance the desorption, and the mixture obviously has better desorption effect than the original soil.
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Key words:
- environmental hormone /
- iron oxide /
- adsorption/desorption /
- pollution control /
- environment engineering
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图 1 不同配比条件下液相中阿特拉津浓度随时间变化
Fig. 1. Atrazine concentration with time change under the conditions of different ratios of soil and goethite
图 2 不同配比条件下液相中阿特拉津浓度随温度变化
Fig. 2. Atrazine concentration with temperature change under the conditions of different ratios of soil and goethite
图 3 不同配比条件下液相中阿特拉津浓度随pH变化
Fig. 3. Atrazine concentration with pH change under the conditions of different ratios of soil and goethite
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