| 多环芳烃在岩溶地下河表层沉积物-水相的分配 |
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| 引用本文： | 蓝家程,孙玉川,肖时珍.多环芳烃在岩溶地下河表层沉积物-水相的分配[J].环境科学,2015,36(11):4081-4087. |
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| 作者姓名： | 蓝家程 孙玉川 肖时珍 |
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| 作者单位： | 贵州师范大学喀斯特研究院, 贵阳 550001;国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001;西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715;贵州师范大学喀斯特研究院, 贵阳 550001;西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715;国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 |
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| 基金项目： | 重庆市院士专项(cstc2013jcyjys20001); 国家自然科学基金项目(41072192, 41103068); 中央高校基本科研业务费专项(XDJK2013D012, XDJK2013B021); 西南大学博士基金项目(SWU110258); 应对全球气候变化地质调查综合研究项目(12120113006700) |
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| 摘 要： | 利用实测老龙洞地下河水中和沉积物中多环芳烃(polycyclic aromatic hydrocarbons,PAHs)的实际浓度,获取了溶解相-沉积物中PAHs的分配系数Kp值.研究了老龙洞地下河PAHs在水相和沉积物中的质量浓度变化及其在水相和沉积物间的分配.研究结果表明水相和沉积物中PAHs质量浓度分别为81.5~8 089 ng·L-1,平均值(1 439±2 248)ng·L-1和58.2~1 051 ng·g-1,平均值(367.9±342.6)ng·g-1;PAHs组成均以2~3环为主,但沉积物中明显富集高环PAHs.沉积物-水相Kp值分布在55.74~46 067 L·kg-1范围内,随PAHs环数的增加而增大.沉积物-水相中实测的有机碳分配系数(lg Koc)大部分高于预测值上限,PAHs强烈吸附在沉积物上.lg Koc与正辛醇-水分配系数(lg Kow)呈较好的线性自由能关系(R2=0.75),但其斜率小于1,推测地下河沉积物对PAHs化合物的吸收能力较差.
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| 关 键 词： | 岩溶地下河 多环芳烃 影响因素 分配 分配系数 |
| 收稿时间： | 2015/3/27 0:00:00 |
| 修稿时间： | 7/1/2015 12:00:00 AM |
Water-Sediment Partition of Polycyclic Aromatic Hydrocarbons in Karst Underground River |
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| LAN Jia-cheng,SUN Yu-chuan and XIAO Shi-zhen.Water-Sediment Partition of Polycyclic Aromatic Hydrocarbons in Karst Underground River[J].Chinese Journal of Environmental Science,2015,36(11):4081-4087. |
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| Authors: | LAN Jia-cheng SUN Yu-chuan and XIAO Shi-zhen |
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| Affiliation: | School of Karst Science, Guizhou Normal University, Guiyang 550001, China;State Key Engineering Technology Research Center for Karst Rocky Desertification Rehabilitation of China, Guiyang 550001, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, School of Geographical Science, Southwest University, Chongqing 400715, China;School of Karst Science, Guizhou Normal University, Guiyang 550001, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, School of Geographical Science, Southwest University, Chongqing 400715, China;State Key Engineering Technology Research Center for Karst Rocky Desertification Rehabilitation of China, Guiyang 550001, China |
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| Abstract: | Based on polycyclic aromatic hydrocarbons (PAHs) field data of dissolved phase and sediment phase, partition coefficient Kp in sediment-water interface from Laolongdong underground river was obtained. The concentration of PAHs in water and sediment and partition coefficient Kp in sediment-water interface were studied. The results showed PAHs concentrations were 81.5-8089 ng ·L-1with a mean value (1439±2248) ng ·L-1 in water and 58.2-1051 ng ·g-1 with an average (367.9±342.6) ng ·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 46067 L ·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 Kocvalue and octanol-water partition coefficient Kow 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. |
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| Keywords: | karst underground river polycyclic aromatic hydrocarbons impact factor partition partition coefficients |
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