The surface-pore integrated effect of soil organic matter on retention and transport of pharmaceuticals and personal care products in soils

文献类型： 外文期刊

第一作者： Qin, Qin

作者： Qin, Qin;Chen, Xijuan;Zhuang, Jie;Qin, Qin;Zhuang, Jie

作者机构：

关键词： PPCPs;Pore-filling SOM;Transport;Soil pore;Microaggregates

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

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年卷期：

页码：

收录情况： SCI

摘要： Abstract This study examines a surface-pore integrated mechanism that allows soil organic matter (SOM) to influence the retention and transport of three representative pharmaceuticals and personal care products (PPCPs)—ibuprofen, carbamazepine, and bisphenol A—in agricultural soil. A series of sorption-desorption batch tests and breakthrough column experiments were conducted using manured and non-manured soils. Results show that SOM could substantially influence the environmental behaviors of PPCPs via two mechanisms: surface-coating and pore-filling. Surface-coating with molecular SOM decreases the sorption of dissociated PPCPs (e.g., ibuprofen) but increases the sorption of non-dissociated PPCPs (e.g., carbamazepine and bisphenol A), while pore-filling with colloidal SOM enhances the retention of all the PPCPs by providing nano‐/micro-pores that limit diffusion. The higher retention and lower mobility of PPCPs in soil microaggregates than in bulk soils suggest that SOM content and SOM-altered soil pore structure could exert a coupled effect on PPCP retention. Differences in the elution of PPCPs with low surface tension solution (i.e., 20% ethanol) in the presence and absence of SOM indicate that PPCPs prefer to remain in SOM-filled pores. Overall, ibuprofen has a high environmental risk, whereas carbamazepine and bisphenol A could be readily retarded in agricultural soils (with a loamy clay texture). This study implies that SOM accrual (particularly pore-filling SOM) has a high potential for reducing the off-site risks of PPCPs by increasing soil nano‐/micro-porosity. Graphical abstract Display Omitted Highlights ? SOM controls PPCP transport by modifying surface and pore systems. ? Dissociated PPCPs have larger off-site risks in agricultural soils. ? Mineral surface reduces transport of dissociated PPCPs. ? Pore-filled SOM reduces transport of dissociated and non-dissociated PPCPs. ]]>

分类号： X1

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