Lan Jia-cheng, Sun Yu-chuan, Xiao Shi-zhen
Huan Jing Ke Xue. 2015 Nov;36(11):4081-7.
Based on polycyclic aromatic hydrocarbons (PAHs) field data of dissolved phase and sediment phase, partition coefficient K(p) in sediment-water interface from Laolongdong underground river was obtained. The concentration of PAHs in water and sediment and partition coefficient K(p) in sediment-water interface were studied. The results showed PAHs concentrations were 81.5-8 089 ng x L(-1) with a mean value (1 439 ± 2 248) ng x L(-1) in water and 58.2-1 051 ng x g(-1) with an average (367.9 ± 342.6) ng x g(-1) in sediment. The dominant PAHs were 2-3 rings PAHs in water and sediment. However, high rings PAHs obviously enriched in the sediment. Partition coefficients varied from 55.74 to 46 067 L x kg(-1) in sediment-water interface, increasing with the rise of PAH compounds. All the organic carbon partition in sediment-water interface were higher than predicate values based on typical model of equilibrium distribution indicated that PAHs were strongly adsorbed in sediment. The linear free-energy relationship coefficient between K(oc) value and octanol-water partition coefficient K(ow) was 0.75, but the slope was lower than 1, indicating that sediment in Laolongdong underground river had weakly lipophilic characteristics and adsorption ability for PAHs.
基于多环芳烃（PAHs）溶解相和沉积物相的现场数据，获得了老龙洞地下河沉积物 - 水界面的分配系数K(p)。研究了水中和沉积物中PAHs的浓度以及沉积物 - 水界面的分配系数K(p)。结果表明，水中PAHs浓度为81.5 - 8089 ng x L(-1)，平均值为(1439 ± 2248) ng x L(-1)；沉积物中PAHs浓度为58.2 - 1051 ng x g(-1)，平均值为(367.9 ± 342.6) ng x g(-1)。水中和沉积物中PAHs的主要成分是2 - 3环PAHs。然而，高环PAHs在沉积物中明显富集。沉积物 - 水界面的分配系数在55.74至46067 L x kg(-1)之间变化，随PAH化合物的增加而增大。沉积物 - 水界面的所有有机碳分配均高于基于典型平衡分布模型的预测值，表明PAHs在沉积物中强烈吸附。K(oc)值与正辛醇 - 水分配系数K(ow)之间的线性自由能关系系数为0.75，但斜率低于1，表明老龙洞地下河的沉积物对PAHs具有弱亲脂性特征和吸附能力。
