长江嘉陵江重庆段多环芳烃的分布特征和来源辨析
Distribution characteristics and sources of polycyclic aromatic hydrocarbons (PAHs) from Yangtze and Jialing River in Chongqing
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摘要: 2014年7月,采集长江嘉陵江重庆段9个断面的地表水和沉积物样品,检测15种多环芳烃(PAHs)含量.结果表明,地表水的∑PAHs浓度范围为65.6-1249 ng·L-1,沉积物中∑PAHs浓度范围为68.6-4226 ng·g-1,与其历史浓度水平相当;聚类分析表明,化工园区对其下游PAHs分布有一定影响,园区下游地表水和沉积物∑PAHs浓度最高.两江汇流前,地表水4环PAHs占总量的43.63%-61.68%;两江汇流后,2环比例增加,占总量的29.01%-68.72%;沉积物4环PAHs占总量的26.62%-48.74%.在顺流方向,地表水中河左∑PAHs浓度高于河中和河右,沉积物中∑PAHs浓度横向无明显差别,其中化工园区下游可能是受左岸工业影响,地表水中河左∑PAHs浓度是河中、河右的12倍和7倍,沉积物中河左∑PAHs浓度是河右的7倍.环数组成、分子比值和主成分分析表明研究区域地表水PAHs来源主要为木材、煤燃烧源,同时还包括石油燃烧和石油泄漏,沉积物则主要为木材、煤高温燃烧源.Abstract: Fifteen polycyclic aromatic hydrocarbons (PAHs) in surface water and sediment samples were measured from 9 sections of the Jialing River and Yangtze River in Chongqing in July 2014.The results showed that the total concentrations of PAHs ranged from 65.6 to 1249 ng·L-1 in surface water and from 68.6 to 4226 ng·g-1 in sediment,with a comparable level to historical concentrations.Cluster analysis showed that the chemical industry park affected the distribution of PAHs on the downstream,where the concentrations of PAHs in surface water and sediment were the highest.In surface water,before the confluence of the two rivers,4-ring PAHs accounted for 43.63%-61.68% of the total concentrations,while after the confluence of two rivers,2-ring PAHs increased to 29.01%-68.72%.In sediments,4-ring PAHs accounted for 26.62%-48.74%.On downstream,the total concentrations of PAHs in surface water on the left bank were higher than in the middle and on the right bank,and the lateral distribution of PAHs in sediment had no obvious difference.In the downstream of chemical industry park,the content of PAHs in surface water on the left bank was 12 times higher than in the middle and 7 times higher than on the right bank,while in sediment,the content of PAHs on the left bank was 7 times higher than on the right bank,maybe influenced by the industry on the left bank.An evaluation of PAHs sources based on the composition of PAHs,molecular ratios and principal component analysis suggested that PAHs in surface waters mainly derived from combustions of wood and coal,a small amount derived from combustions and discharge of oil,while derived from the high temperature combustion of wood and coal in sediments.
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Key words:
- PAHs /
- surface water /
- sediment /
- chemical industrial park /
- distribution /
- origin /
- Yangtze River /
- Chongqiong
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