多种环境因子交互作用对沉积物吸附阿特拉津的影响

采用自行研制的模拟自然水环境吸附解吸系统实验装置, 运用24完全析因实验设计, 研究4种环境因子（pH、 离子强度、 曝气强度和温度）共同作用对沉积物吸附阿特拉津的影响规律, 并利用固定效应模型估算各环境因子主效应和高阶交互效应对沉积物吸附阿特拉津的贡献. 结果表明： 4种环境因子主效应对沉积物吸附阿特拉津的影响均较大（显著性水平0.05）, 其中曝气强度与离子强度促进沉积物吸附阿特拉津, 温度与pH抑制沉积物吸附阿特拉津； 4种环境因子的二阶交互效应对沉积物吸附阿特拉津的影响也较大（显著性水平0.05）, 效应估计值依次为温度×pH值=-73.53, 曝气强度×pH值          =-59.03, 温度×离子强度=33.19, pH值×离子强度=27.55; 在三阶交互作用中, 仅有曝气强度×温度×pH值可促进沉积物吸附阿特拉津（显著性水平0.05）.

Characteristics of Atrazine Adsorption onto Surficial SedimentsInfluenced by Interaction of Various Environmental Factors

In order to fully reveal the migration and transformation of the pesticide atrazine in natural water bodies we studied the characteristics of atrazine adsorption on the sediments influenced by a variety of environmental factors (such as pH, ionic strength, aeration rate, and temperature) via
the simulation by means of self\|designed natural water environment adsorption/desorption system experimental device based on 24 full factorial experimental design, and then employed the fixed effect model to analyze the contribution from the mathematical quantitative perspective about the main effects of various environmental factors and higher order interaction effects to adsorption of atrazine on the sediments. It was found that the main effects of the four selected environmental factors (pH, ionic strength, aeration rate, and temperature) all have a significant impact (significance level of 005) to atrazine adsorption on the sediments, in which the aeration rate and the ionic strength significantly promote atrazine adsorption on sediments, while the temperature and pH significantly restrain atrazine adsorption on the sediments; the second order interaction of environmental factors which have a significant influence on the atrazine adsorption (significance level of 0.05) follows the order of temperature×pH=-73.53, aeration×pH=-59.03, temperature×ionic strength=33.19, and pH×ionic strength=27.55, and only the third order interaction of aeration rate×temperature×pH is be significant (significance level of 0.05), which promotes the atrazine adsorption on sediments.