| 降雨期间岩溶地下河溶解态多环芳烃变化特征及来源解析 |
| 摘要点击 1760 全文点击 876 投稿时间：2015-05-05 修订日期：2015-06-12 |
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| 中文关键词 多环芳烃 降雨 岩溶地下水 来源 南山 |
| 英文关键词 polycyclic aromatic hydrocarbons rainfall karst subterranean river source Nanshan |
| 作者 | 单位 | E-mail | | 江泽利 | 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 | jiangzeli1991@163.com | | 孙玉川 | 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
中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 桂林 541004 | sunyc@swu.edu.cn | | 王尊波 | 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 | | | 梁作兵 | 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 | | | 任坤 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 桂林 541004 | | | 谢正兰 | 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 | | | 张媚 | 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 | | | 廖昱 | 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 | |
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| 中文摘要 |
| 2014年6月降雨期间在重庆南山老龙洞地下河出口处进行连续采样监测,利用GC-MS定量分析地下河溶解态中16种优控多环芳烃(PAHs)的含量,研究了降雨期间地下河溶解态PAHs变化特征及来源. 结果表明,地下河溶解态PAHs对降雨反应迅速,∑PAHs出现4个峰值,有2个出现在流量上升阶段,另外两个分别出现在流量最大值处和流量下降阶段. ∑PAHs范围为101~3624 ng ·L-1,平均值578 ng ·L-1,7种致癌性PAHs变化较大,含量变化为ND~336 ng ·L-1,平均值31.1 ng ·L-1,PAHs的组成以低环(2、 3环)为主,占水体∑PAHs的86.17%; 降雨对∑PAHs影响较大,主要表现为雨水对大气污染物的清除及地表径流对地表污染物的冲刷. 降雨期间水体中PAHs主要来源于石油类产品、 煤炭等化石燃料的不完全燃烧、 天然成岩过程,降雨期间老龙洞地下河水体中PAHs污染大部分为中等到重污染水平. |
| 英文摘要 |
| The water samples were continuously collected at the outlet of Nanshan Laolongdong subterranean river basin, which is located in Chongqing, during the rainfall event in June 2014. Sixteen priority polycyclic aromatic hydrocarbons (PAHs) in water were quantitatively analyzed by gas chromatography-mass spectrometry (GC-MS). The objectives of this study were to reveal the variation characteristics and sources of PAH16 in karst subterranean river during the rainfall event. The results showed that the subterranean river responded promptly to the rainfall, and there were four peaks of the total concentrations of PAH16, two peaks occurred during the flow rise stage, the others were in the maximum flow and flow decline stages. The total concentrations of PAH16 ranged 101-3624 ng ·L-1, with a mean of 578 ng ·L-1, the total concentrations of 7 carcinogenic PAHs ranged ND-336 ng ·L-1, with a mean of 31.1 ng ·L-1. The PAH compositional profiles were dominated by 2,3-ring compounds, which accounted for 86.17% of the total concentrations of PAH16. The total concentrations of PAH16 were most influenced by the rainfall, through the cleaning of atmospheric pollutants by the rain and the scouring of the surface contaminants by the rainfall runoff. The PAHs in water mainly originated from the incomplete combustion of petroleum products and fossil fuels such as coal, as well as natural digenetic process. Compared to other areas in the world, the concentrations of PAH16 were generally at moderately polluted and heavily polluted levels. |
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