阿特拉津在土壤中的吸附行为

Adsorption of Atrazine in soil slurry samples

研究了阿特拉津(AT)在3种岩性土壤中的吸附规律。探讨了离子强度、TOC和pH等因素对AT吸附的影响。结果表明:TOC对AT在土壤中吸附的影响较大;增加离子强度,会提高AT在土壤中的吸附能力;pH与AT的吸附量呈负相关。

Adsorption isotherm and rate experiments were performed on three soil slurry samples （50 g/100 mL of solution） to determine the effects of pH,ionic strength, and TOC on adsorptive capacities for atrazine. The small observed capacities for atrazine were due to its high water solubility （33 mg/L at 27℃）; the capacities vs. equilibrium concentration relationships were well correlated by the Freundlich adsorption isotherm. Organic content of the soil sample was the most important factor affecting the atrazine capacity; the highest capacity was found in the soil slurry with the highest TOC. The capacity was higher at a higher ionic strength （NaCl and KNO3 concentration） and/or a lower pH of the slurry sample.