【摘要】 本研究通过模拟5种典型有机磷酸酯(OPEs)在水-土壤界面吸附过程,建立了3种土壤对OPEs的等温吸附方程,并探讨了不同的温度和溶解性有机碳(DOC)浓度对吸附过程的影响.结果表明,5种OPEs单体均能在吸附进行12 h后达到吸附平衡; 5种单体均能较好地符合Freundlich吸附等温方程,决定系数R2范围为0. 963～0. 995;相关性分析表明,结构相似单体的平衡分配系数(Kd)值具有显著相关性(P <0. 05),说明表明除了理化性质,分子结构也是影响Kd值的因素之一.温度和DOC对吸附影响的研究表明,温度对本研究中的5种单体的Kd值影响较为显著,随着温度升高,Kd值均呈现出下降的趋势;磷酸三(2-丁氧基乙基)酯(TBEP)和磷酸三(1,3-二氯-1-丙基)酯(TDCP)的Kd值是受DOC影响最为显著的两类单体,均表现出先迅速降低然后再升高的趋势,而其他几种OPEs单体的Kd值随着DOC的增大并未表现出明显的增高或减少的趋势.更多还原

【Abstract】 In this study,the absorption behavior of five organophosphate esters( OPEs) congeners was monitored in a water-soil system,and three absorption isotherm equations were modeled. Furthermore,the factors influencing the absorption process including temperature and dissolved organic carbon( DOC) were also investigated. The results showed that an equilibrium state was reached after12 hours of absorption for these five OPEs congeners,which could be appropriately modeled by the Freundlich isotherm equations with R2 values ranging from 0. 963 to 0. 995. Significant correlations were observed among the Kd( partitioning coefficient) values and similar chemical structures of OPEs. The Kdvalues decreased with increasing temperature,indicating the significant role played by temperature. TBEP and TDCP were highly impacted by the DOC content,and for the other OPEs congeners,no clear tendency in Kd values was found with increasing of DOC content.更多还原