Effect Of Environmental Factors On Atrazine Adsorption Onto Surficial Sediments

In order to quantify the process for contaminants removal and transform in natural water system generally.7environmental factors (pH, temperature, ionic strength, aeration strength, disturbance strength, redox potentials, water depth) were studied for indicating their influence when surficial sediments adsorbing atrazine (AT) in single or combined pollution systems. We use orthogonal experimental design and factorial experiment design to indicate multiple-environmental factors'Influence to adsorption on surficial sediments, by which they meet the requirements of the significant test (p<0.05).The experimental results indicate that ionic strength, aeration strength and disturbance strength could facilitate the adsorption of AT as increasing of their levels, and the promotion has been found to be the most significant of ionic strength; it is also found that the adsorption of AT is restrained by pH, temperature and water depth as increasing of their levels, especially the inhibition effect of pH is most significant. The information also shows that pH, temperature, ionic strength, aeration strength have the evident effects on AT adsorption and the influence to the environmental factors follow the order of pH> ionic strength> temperature≈aeration strength. Meanwhile, there are significant contributions made by environmental factors interactions; the dominating factors would be changed when they have different levels.The interactions with pH are the most dominant factors in AT individual existence system, and the influence follow the order of aeration*temperature*pH> temperature*pH> aeration*pH>*temperature*ionic strength> ionic strength*pH. pH is the only dominating factors to Cu2+adsorption in surface sediment under copper-AT composite contamination system, and there are no significant interactions, however, the interactions play important roles in AT adsorption with following order of ionic strength*pH>aeration*temperature*ionic strength>aeration*temperature> temperature*ionic strength>aeration*ionic strength>aeration*temperature*pH> aeration*temperature*pH*ionic strength>temperature*pH. Copper could enhance the environmental factors and their interactions effects to AT adsorption, especially emphasizing the interaction influence between pH and ionic strength, which indicate that pH is the dominating factor when low pH level and ionic strength is the dominating factor when high pH level.