多环芳烃在黄河水体颗粒物上的表面吸附和分配作用特征  

Adsorption and Partition of PAHs on Particles of the Yellow River

作　　者：孟丽红[1] 夏星辉[1] 余晖[1] 沙玉娟[1] 

机构地区：[1]北京师范大学环境学院环境模拟与污染控制国家重点实验室,北京100875

出　　处：《环境科学》2006年第5期892-897,共6页Environmental Science

基　　金：国家自然科学基金项目(40201046);国家自然科学基金委员会;水利部黄河水利委员会联合研究基金项目(50239010)

摘　　要：通过模拟实验研究了多环芳烃在黄河水体颗粒物上的吸附特征,重点探讨了表面吸附和分配作用对吸附的贡献,结果表明:①随着泥沙含量的增加,总吸附量在增加,而单位颗粒物的吸附量却在减少;且泥沙含量不同时,吸附等温式的拟合方程也不同;②颗粒物对多环芳烃的吸附等温线与吸附-分配复合模式拟合较好;表面吸附和分配作用对多环芳烃的吸附实验值与吸附-分配模式中的理论值比较吻合;③在实验浓度范围内,黄河颗粒物对多环芳烃的吸附以表面吸附为主,如当颗粒物含量为3、8和15g/L,液相平衡浓度分别为2.84、2.35和3.4μg/L时,表面吸附对总吸附的贡献分别为67.85%、65.6%和62.69%;且表面吸附对总吸附的贡献大小顺序可以用泥沙含量表示为:3g/L>8g/L>15g/L,即随着泥沙含量的增加,表面吸附的贡献有减小的趋势;④单一多环芳烃在颗粒物上的单位吸附量大于3种多环芳烃共存时的单位吸附量,这从另一角度证实多环芳烃在黄河水体颗粒物上的吸附以表面吸附为主.Experiments were carried out to study the sorption of PAHs Benzo （a）pyrene, chrysene and Benzo （g, h, i）perylene on particles of the Yellow River. The contributions of adsorption and partition to the sorption of PAHs were investigated. Several significant results were obtained from the study： ① The total sorption capacity increases with the particle content while the sorption capacity of unit weight particle decreases; the isotherms of Benzo（a）pyrene depend on the particle content. ② Isotherms of Benin（a） pyrene can be fitted with the Dual Adsorption-Partition model under different particle content; the measured value of the adsorption and partition are in accord with the theoretical value of the Dual Adsorption-Partition model. ③ The adsorption is predominant in the sorption of Benzo（a）pyrene. When the particle contents are 3, 8 and 15 g/L and the liquid equilibrium concentrations are 2.84,2.35 and 3.4μg/L, respectively, the contributions of adsorption are 67.8%, 65.6% and 62.69%, respectively. In addition, the contributions of adsorption have a decreasing trend with the increase of the particle content.④ The sorption capacity of Benzo （a） pyrene being alone are bigger than that with other PAils chrysene and Benzo（g, h, i）perylene coexisting in the water system, this also proves that the adsorption is predominant in the sorption of PAHs.

关 键 词：多环芳烃 表面吸附 分配作用 黄河 苯并(A)芘 

分 类 号：X131.2[环境科学与工程—环境科学]