全文下载：2013050485
张景环1,2
(1.青岛科技大学 环境与安全工程学院，山东 青岛 266042;
2.北京师范大学 环境模拟与污染控制国家重点联合实验室，北京 100875)
摘要： 通过静态吸附实验，研究了3种不同类型的溶解性有机质（L-苯丙氨酸、蛋白胨和柠檬酸）对苯并\[a\]芘（BaP）在黑炭表面吸附解吸的影响。结果表明，3种溶解性有机质的存在均会增加BaP在黑炭表面吸附的非线性程度。L-苯丙氨酸和蛋白胨的存在均可以抑制BaP在黑炭表面的吸附，同时促进了BaP的解吸，这主要取决于L-苯丙氨酸和蛋白胨对BaP的增溶作用。但是由于BaP可以分配到黑炭表面吸附态的蛋白胨中，在相同添加浓度下，L-苯丙氨酸对BaP吸附的抑制作用更强。与L-苯丙氨酸和蛋白胨相反，柠檬酸的存在增加了BaP在黑炭表面的吸附并减小了吸附过程的可逆性，这主要是由于吸附在黑炭表面的柠檬酸对BaP的吸附作用。当柠檬酸的浓度从0 mg·L-1增加到50和100 mg·L-1时，BaP的吸附能力参数Kd值（在ce=100 μg·L-1下）分别从119 268 mL·g-1升高到134 877和180 639 mL·g-1，解吸滞后指数H分别从0.44减小到0.41和0.39。
本研究为预测多环芳烃在溶解性有机质污染的环境中的分布特征和最终归趋提供了理论依据。
关键词： 溶解性有机质; 黑炭; 苯并\[a\]芘; 吸附; 解吸
中图分类号： X 131.2文献标志码： A
Effect of Dissolved Organic Matter on Sorption and Desorption of Benzo\[a\]pyrene on Black Carbon
ZHANG Jing-huan1,2
(1.CollegeofEnvironmentand Safety Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China;
2. State Key Joint Laboratory of Environment Simulation and Pollution Control,
SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,China)
Abstract: Sorption and desorption of benzo\[a\]pyrene (BaP) on black carbon (BC) extracted from sediment were studied in the presence of three types of dissolved organic matter (DOM), including L-phenylalanine, peptone and citric acid, to examine the role of DOM in sorption and desorption. Nonlinearity of the sorption isotherms of BaP increased in the presence of DOM. The presence of L-phenylalanine and peptone both reduced the sorption capacity and desorption hysteresis because of the solubilization of PHE in L-phenylalanine and peptone solution. Compared to peptone, L-phenylalanine can inhibit BaP sorption more strongly at the same concentration, due to the distribution of BaP to the absorbed peptone on BC surface. Unlike L-phenylalanine and peptone, citric acid enhanced the sorption capacity and irreversibility of BaP on BC mainly due to the strong sorption of citric acid on BC surface. When the critic acid concentration increased from 0 to 50 and 100 mg·L-1, the sorption capacity parameter Kd value (at ce=100 μg·L-1) increased from 119 268 mL·g-1to 134 877 and 180 639 mL·g-1, respectively, and the hysteresis index H value decreased from 0.44 to 0.41 and 0.39. Our finding can provide more information for predicting the distribution and fate of PAH in the DOM polluted environment.
Key words:dissolved organic matter; black carbon; benzo\[a\]pyrene; sorption; desorption
收稿日期：2012-07-29
基金项目：国家自然科学基金项目（21107063）；环境模拟与污染控制国家重点联合实验室（北京师范大学）开放课题专项项目（10K05ESPCN）.
作者简介：张景环（1982—），女，讲师.
