含氮生物降解促进剂对土壤吸附正十六烷的影响

Effects of nitrogen-contained biodegradation enhancers on adsorption of hexadecane in water-soil system

选用正十六烷模拟润滑油,通过振荡平衡实验,考察了两种含氮脂肪酸型生物降解促进剂(甲基二乙醇胺油酸酯(MDEAO)和油酸二乙醇酰胺(ODEA))对水土体系中正十六烷吸附行为的影响。实验结果表明:正十六烷在水土体系中的有机质标化分配系数与土壤种类无关,与生物降解促进剂种类有关;土壤对正十六烷的吸附过程更符合Freundlich等温吸附模型;MDEAO的临界胶束浓度为2.0 mg/L,对土壤吸附正十六烷有一定的促进作用,ODEA的临界胶束浓度为0.7 mg/L,形成的胶束对正十六烷的增溶效果明显,促进了正十六烷在土壤中的解吸。

Using n-hexadecane as simulate lubricant , the effects of two nitrogen-containing fatty acid biodegradation enhancers ( methyl diethanolamine oleate ( MDEAO ) and oleic diethanolamide ( ODEA )) on adsorption of n-hexadecane from water-soil system were investigated by oscillation equilibrium experiments. The experimental results showed that : The standard partition coefficients of n-hexadecane in water-soil system were independent of soil type but relevant to enhancer type;The adsorption of n-hexadecane on soil followed Freundlich isothermal adsorption model better;MDEAO with critical micelle concentration ( CMC ) of 2.0 mg/L could enhance the adsorption of n-hexadecane on soil , oppositely , ODEA with CMC of 0.7 mg/L could promote the desorption of n-hexadecane from soil in virtue of the solubilization ability of ODEA micelle to n-hexadecane.