【摘要】 建立了气相色谱/质谱同时测定水样中正十二烷、菲和苯酚的方法,研究了石油烃类污染物组分正十二烷、菲和苯酚共存体系在华南地区土壤土水系统中的分配机制及其影响因素。三种污染物在土壤中的吸附过程符合二级动力学方程,吸附速率大小为:正十二烷>菲>苯酚。试验浓度范围内,正十二烷和苯酚在土壤中的吸附符合Freundlish吸附模型;菲在土壤中的吸附符合Langmuir模型,且正十二烷和菲在土壤中的吸附是一个自发的放热过程;苯酚在土壤中的吸附是一个自发的吸热过程。土壤对三种污染物的吸附均以化学吸附为主。正十二烷和菲在土壤中的吸附率与土壤有机质含量呈正相关,相关系数分别为0.94和0.85。土壤不同粒径组分中正十二烷的吸附率大小顺序为:粉(砂)粒>黏粒>细砂粒>粗砂粒,菲的吸附率大小顺序为:粉(砂)粒>细砂粒>黏粒>粗砂粒,苯酚的吸附率大小顺序为:黏粒>粉(砂)粒>细砂粒>粗砂粒。结果表明,研究石油烃类污染物在土水系统中的平衡分配时,应基于各组分的含量、结构与性质的差异进行细分研究。更多还原

【Abstract】 The simultaneous determination method of n-Dodecane,Phenanthrene and Phenol in water sample was developed by gas chromatography-mass spectrometry,and the distribution mechanism and its affecting factors in the coexistence system of n-Dodecane,phenanthrene and Phenol of petroleum hydrocarbon contaminants soil-water system of south China was studied. The results show that the adsorption of the three contaminants in soil can be well described by the second-order kinetic equation,with the adsorption rate of n-Dodecane > phenanthrene > phenol.In the experimental concentration range,the adsorption isotherms of n-Dodecane and phenol can be well fitted by Freundlish isotherm equation,while the Langmuir isotherm equation can be employed for the fitting of the adsorption isotherms of phenanthrene. Moreover,the adsorption of n-dodecane and phenanthrene in the soil is a spontaneous exothermic process,whereas the adsorption of phenol is a spontaneous endothermic process,and the adsorption of soil to the three contaminants is dominated by chemical adsorption. The sorption efficiencies of n-dodecane and phenanthrene are in positive correlation with the organic matter content in the soil,and the correlation coefficients are 0. 94 and 0. 85,respectively. The order of n-dodecane adsorbed by soils in different particle size is: silt >clay > fine sand > coarse sand,the order of phenanthrene adsorption is: silt > fine sand > clay > coarse sand,and that of phenol adsorption is: clay > silt > fine sand > coarse sand. The results show that in the study of the balanced distribution of petroleum hydrocarbon contaminants in soil-water system,subdivision studies should be carried out based on the differences in content,structure and properties of each component.更多还原