摘要
研究了菲在不同土壤和沉积物等天然地质吸附剂上的吸附/解吸行为.结果表明,菲在四种天然地质吸附剂上的吸附和解吸都能较快达到稳态.菲的吸附符合线性吸附等温线,说明菲的吸附是分配作用占主导,吸附系数Kd在24.1—187.5L·kg-1之间.连续解吸实验表明,菲在天然地质吸附剂上的解吸存在不同程度的滞后现象,吸附剂的有机碳含量和菲的加入浓度是影响菲解吸率和滞后程度的重要因素.当菲加入浓度分别为1mg·l-1和2mg·l-1时,在有机碳含量为2.82%的榆林县土壤上的解吸滞后系数为1.61和0.67;而2mg·l-1的菲在有机碳含量为0.69%的泰达河岸土上的滞后系数为-0.06,吸附几乎完全可逆.
Sorption and desorption of phenanthrene by some natural geosorbents （ soils and sediments） were studied. Both sorption and desorption can reach steady state quickly. Under the test conditions, the sorption of phenan-threne followed linear isotherm well, which indicates that partition is the key process controlling the sorption. Distribution coefficients（Kd） ranged from 24. 1 to 187.5 L·kg^-1. Sequential desorption test revealed that desorption of phenanthrene from the geosorbents into aqueous solutions exhibited hysteresis to different extents. Desorption rate and hysteresis extent were influenced by both organic carbon （OC）content of the geosorbents and the initial concentration of phenanthrene. For example, the hysteresis index（HI） was 1.61 and 0. 67 for Yulin soil with an OC content of 2.82% when the initial concentration of phenanthrene was 1 and 2 mg·l^-1, respectively; whereas HI decreased to -0. 06 for Teda soil with an OC content of 0. 69% at 2 mg·l^-1 initial phenanthrene concentration, indicating a reversible sorotion.
出处
《环境化学》
CAS
CSCD
北大核心
2008年第2期158-163,共6页
Environmental Chemistry
基金
国家自然科学基金(20677031)资助项目
关键词
菲
吸附
解吸
phenanthrene, sorption, desorption.
