Abstract:

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.

Key words:  environmental factor； interaction； sediments； atrazine； adsorption