Effects of surfactants on the uptake of PAHs by wheat
表面活性剂对小麦吸收多环芳烃(PAHs)的影响

Influences of surfactants on the uptake of Polycyclic Aromatic Hydrocarbons(PAHs)by wheat was studied by laboratory experiments.The results show that PAHs contents in wheat seedlings growing in Nutrient Solution(NS) with excessive phenanthrene,pyrene and benz(a )pyrene(over their apparent solubility)were influenced upon addition of surfactants.After 40 culture days,surfactant Tween 80 at supra CMC(Critical Aicenlle Concentration) resulted in reduced PAHs concentrations in the wheat root but enhanced phenanthrene and pyrene concentrations in the wheat stem and leaf.When LAS is at CMC and sub CMC levels,decrease and increase of PAHs concentrations were also observed in the wheat root and above ground part,respectively.It mainly resulted from the toxicity of LAS and had no direct relation with the micellation of surfactant.Combination of PAHs and surfactant brought about increased potential risk to the environment.