表面活性剂对小麦吸收多环芳烃(PAHs)的影响

通过研究施加两表面活性剂（Ｔｗｅｅｎ８０和ＬＡＳ）后小麦对多环芳烃的吸收情况得出，含有过量菲、芘和苯并（ａ）芘营养液中生长的小麦ＰＡＨｓ含量受表面活性剂影响显著。在培养４０ｄ后，ＣＭＣ以上Ｔｗｅｅｎ８０使小麦根中菲、芘和苯并（ａ）芘含量下降，即促进了小麦茎叶中菲和芘的含量。ＣＭＣ和ＣＭＣ以下ＬＡＳ也使小麦中ＰＡＨｓ含量降低而茎叶中ＰＡＨｓ含量增加，但主要是ＬＡＳ对植物毒害作用结果，与表面活性剂胶束

Effects of surfactants on the uptake of PAHs by wheat

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.