非离子表面活性剂对有机磷农药在沉积物上吸附行为的影响  

THE EFFECT OF NONIONIC SURFACTANT ON ADSORPTION OF PHOSPHOROUS ORGANIC PESTICIDE IN SEDIMENTS

作　　者：杨成建[1] 曾清如[1] 廖柏寒[1] 杨海君[1] 汤灿[1] 

机构地区：[1]湖南农业大学环境科学系,长沙410128

出　　处：《环境化学》2006年第2期159-163,共5页Environmental Chemistry

基　　金：湖南省科技计划(04SK3019)资助项目

摘　　要：用振荡平衡方法,研究了非离子表面活性剂Brij35和Brij30在沉积物上的吸附行为及其对甲基对硫磷在三种沉积物上吸附的影响．结果表明:Brij35的吸附符合Langmuir型吸附等温线;Brij30的吸附符合 S型吸附等温线．对于有机质含量高的沉积物,Brij35抑制甲基对硫磷的吸附,Brij30在加入浓度大于CMC 时能促进甲基对硫磷的吸附,低于CMC时则抑制甲基对硫磷的吸附．对于有机质含量低的沉积物,Brij35 和Brij30均能使甲基对硫磷的吸附量增加．表面活性剂对甲基对硫磷吸附行为的影响机理为吸附态和溶解态的表面活性剂对甲基对硫磷的吸附和增溶共同作用的结果,表面活性剂吸附态对甲基对硫磷吸附的贡献主要来自于吸附并集聚于沉积物表面的表面活性剂,通过分配作用进入沉积物有机质的表面活性剂吸附态贡献率小．By using batch adsorption method, adsorption isotherms of two nonionic surfactants （ Brij30, Brij35 ） in three sediments were investigated and adsorption behaviors of parathion-methyl between sediments and water with or without the presence of Brij30 or Brij35 were compared. The results showed that the Langmuir model was appropriate for describing the adsorption isotherms of Brij35 in sediments, and adsorption isotherms of Brij30 were agreed to S model. For sediments with high organic matter content （foc =2. 2567 ×10^4 mg·kg^-1 , foc = 1. 8678 ×10^4 mg·kg^-1 ）, Brij35 reduced the adsorption of parathion methyl in the sediments over the set range of Brij35 concentrations. When Brij30 concentration was more than CMC, the adsorption of parathion-methyl in the sediments increased. However, the adsorption of parathion-methyl reduced at lower Brij30 concentration than CMC. For the sediments with low organic matter content （foc = 1. 1551×10^4 mg·kg^-1）, the adsorption of parathion-methyl in sediments increased with increasing Brij35, Brij30. The impact of nonionic surfactant on the parathion methyl distribution between a sediment and water was related to the organic matter content of sediments, properties and concentrations of the nonionic surfactant, and the adsorption behavior in sediments. Nonionic surfactant partitioned to sediment organic matter had little impact on adsorption of parathion methyl, while the surfactant adsorbed and aggregated on sediment mineral matter significantly increased the adsorption of parathion methyl.

关 键 词：沉积物 甲基对硫磷 非离子表面活性剂 吸附 

分 类 号：X132[环境科学与工程—环境科学]