表面活性剂对小麦吸收多环芳烃(PAHs)的影响  

Effects of surfactants on the uptake of PAHs by wheat

作　　者：李滢[1] 区自清[1] 孙铁珩[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110015

出　　处：《生态学报》2000年第1期99-102,共4页Acta Ecologica Sinica

基　　金：国家自然科学基金!2 96 770 2 1;中国科学院陆地生态系统痕量物质生态过程开放实验室基金

摘　　要：通过研究施加两种表面活性剂(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,却促进了小麦茎叶中菲和芘的含量。CMC及CMC以下LAS也使小麦根中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,与表面活性剂胶束作用无关。PAHs与表面活性剂复合污染增加了对环境的潜在危害。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.

关 键 词：表面活性剂 小麦 吸收 多环芳烃 环境污染 危害 

分 类 号：X171[环境科学与工程—环境科学]