蒽在几种典型土壤中的吸附行为研究

ADSORPTION BEHAVIOR OF ANTHRACENE ON TYPICAL SOILS

采集了黑龙江黑土、江西红壤、北京潮土、新疆灰漠土,并从中提取了胡敏酸。这些土壤和胡敏酸样品均采用红外光谱进行定性分析,并以这些土壤及其胡敏酸作为吸附剂吸附多环芳烃蒽,蒽的定量采用荧光光度法。结果表明,黑土对蒽的初期吸附速度较快,吸附50 h后达到平衡。土壤及其胡敏酸对蒽的吸附均较好地符合了Freundlich模型,说明吸附属多种吸附点共同作用,每种吸附位点表现不同的吸附自由能及位点总剩余度。不同种类的土壤对蒽的吸附能力不同,吸附能力与土壤中有机质含量成正相关关系。不同来源胡敏酸对蒽的吸附能力不同,这种吸附能力的差异可能与构成该土壤胡敏酸生物大分子的某些化学基团含量不同有关。

Four kinds of typical soils in china, including phaeozem collected from Heilongjiang, krasnozem collected from Jiangxi, fluvo - aquic soil collected from Beijing and grey desert soil col- lected from Xinjiang, were collected and humic acids （HAs） isolated from the soil samples were chosen to adsorb anthracene from water, which was detected by fluorescence spectrometry. The soils and their humic acids were characterized by Fourier transform infrared spectroscopy （FTIR）. As the results shows, the adsorption of anthracene on the phaeozem is comparatively quick at first and need 50 h to achieve equilibration. Under the experimental conditions, all the isotherms conform Freundlich model, which means that the adsorption may be caused by recombination action of many kinds of adsorption points, every point has different free energy and total redundancy. The adsorption capacities of soil samples are positively related with the contents of soil organic matter （SOM） Humic acids from different soils change in adsorption amount, which may be caused by the contents of some groups that constitute the macromolecules.