土壤经不同氧化剂梯度氧化后吸附芘的模型拟合

Model Fitting Results of Pyrene Sorption on Soil After Gradient Oxidations by Different Oxidants

使用芬顿试剂(F)和次氯酸钠(Na)2种氧化剂对北京东灵山(DL)和云南曲靖(YN)2种山地土壤进行梯度氧化控制,并将氧化前后的土壤进行芘的批量吸附实验.实验结果用6种土壤吸附疏水性有机污染物(HOCs)拟合模型进行拟合,利用判定系数R2和加权方差MWSE判定拟合优劣程度.Polanyl-Manes模型(PMM)在各氧化梯度下具有较小的1-R2和MWSE值.模型模拟得到饱和吸附容量(Q0),次氯酸钠氧化的YN土壤的Q0大于芬顿试剂氧化的YN土壤的Q0,DL则与之相反;次氯酸钠氧化的YN土壤的Q0大于其氧化的DL土壤Q0.2种氧化剂条件下,TOC含量较高的DL土壤(0～2.5%)对芘的最大吸附容量与TOC的含量呈正相关.相反,TOC含量较低的YN土壤(0.1%～0.5%)对芘的最大吸附容量则与TOC含量呈负相关,2个分别被芬顿试剂和次氯酸钠氧化后的梯度组吸附容量不由TOC含量主导.4个氧化梯度组中有效吸附潜力均和TOC之间存在线性相关关系,DL土壤被次氯酸钠氧化后有效吸附潜力与TOC呈负相关,其余3个组呈正相关.

The influences of the sorption of pyrene on soils after the gradient oxidations with Fenton and NaClO on soil were investigated using two different soil samples from Dongling,Beijing（DL） and Qujing,Yunnan（YN）,China.Six models were used to simulate the sorption using coefficient of determination（R^2） and mean weighted square errors（MWSE） to evaluate the goodness of fitting.The results showed that Polanyl-Manes model fitted best among all these models.Both gradient oxidations secured the positive correlation between adsorption capacity of DL soil and TOC,while the results for YN soil were on the opposite.The adsorption capacities of YN soils oxidated by NaClO were stronger than that oxidated by Fenton while opposite results were identified for DL soils.YN soils oxidated by NaClO had stronger adsorption capacities than DL soils.The adsorption of pyrene was influenced by TOC of soil with high TOC（〈2.5%） while no influences were identified with low TOC（0.1%-0.5%）.Both DL and YN soils oxid.ated by NaClO had more equilibrium adsorption potentials.The equilibrium adsorption potentials had good significant linear relationships with TOC.DL soils oxidated by NaClO secured the positive correlation between equilibrium adsorption potentials and TOC,while opposite results were identified in other three oxidated soil groups.