Effects of nonionic and amphiphilic hydrocarbon surfactants on the transport of perfluorooctanoic acid in soils
The extensive use of perfluorooctanoic acid(PFOA)leads to its widespread coexistence with kinds of hydrocarbon surfactants in the subsurface environment,which has posed potential risks to human health and ecological security.In this study,column experiments were conducted to explore the effect of nonionic hydrocarbon surfactant alkyl polyglycoside(APG)and amphiphilic surfactant dodecyl dimethyl betaine(BS-12)on the transport of PFOA in two saturated soils under different ionic strength.The results showed that APG could promote the transport of PFOA due to its competitive adsorption with PFOA on the soil surface.BS-12 could inhibit the transport of PFOA by neturalizing the negative charge on soil surface and hydrophobic interaction.Therefore,the effects coexisting hydrocarbon surfactants should be considered when predicting and evaluating the transport behavior of PFOA in soils.
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