全文下载：2013030225
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，研究了不同燃烧温度形成的沉积物有机质对苯并\[a\]芘(BaP)的吸附解吸行为。结果表明，当燃烧温度从0 ℃升高到400 ℃时，吸附非线性指数n值从0.544降低到0.299。然而，沉积物有机质形成温度的升高增加了BaP的吸附能力和解吸滞后性。当燃烧温度升高到600 ℃时，样品中脂肪结构、极性结构和大部分芳香结构被燃烧掉，主要剩下矿物组分。因此，T600样品对BaP表现出高的n值、低吸附能力和吸附不可逆性。单一浓度下有机碳标化的吸附能力参数lgKoc值与芳香碳含量显著正相关（p<0 .001），而与样品的h/c原子比显著负相关（p <0.001）。样品的芳香碳含量与bap的解吸滞后指数 (h) (p < 0.01)和n值(p < 0.000 1)均表现出很好的负相关关系。以上的结论说明，芳香碳在bap的吸附非线性、吸附能力和解吸滞后性中起主要作用。
关键词: 沉积物有机质; 苯并\[a\]芘; 吸附; 解吸; Koc； 形成温度
中图分类号: X 131.2文献标志码： A
Effect of Formation Temperature on Sorption and Desorption of Benzo\[α\]pyrene by Sediment Organic Matter
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, School of Environment, Beijing Normal University, Beijing 100875, China)
Abstract: Sorption and desorption isotherms of benzo\[α\]pyrene (BaP) on sediment organic matter (SOM) prepared at different combustion temperature were studied to examine the impact of SOM structure on sorption and desorption. With the increase of combustion temperature from 0 ℃ to 400 ℃, the sorption isotherm nonlinearity index n value decreased from 0.544 to 0.299. However, the increase of formation temperature enhanced the adsorption capacity and desorption hysteresis for BaP on SOM. When the combustion temperature increased to 600 ℃, aliphatic structures, polar structures and most aromatic structures were burnt out, and the mineral materials were dominant in the sample. Higher n value, lower sorption capacity and sorption irreversibility of BaP were presented in the sample treated at 600 ℃ (T600). Positive correlations between single-point organic carbon-normalized distribution coefficient logKoc values and aromatic carbon (p < 0.001) and negative correlations between log koc values and h/c ratios (p < 0.001) were observed. there was a negative relation between hysteresis index (h) value and aromatic carbon and a negative trend of n values and aromatic carbon. the above results indicated the dominance of aromatic structures in the sorption nonlinearity, sorption capacity and desorption hysteresis of bap on som.
Key words: formation temperature; sediment organic matter; benzo\[a\]pyrene; sorption; desorption; Koc
收稿日期：2012-07-12
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，博士，讲师.
