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表层岩溶带土壤中多环芳烃分布特征及来源解析

孙玉川 沈立成 袁道先

孙玉川, 沈立成, 袁道先. 表层岩溶带土壤中多环芳烃分布特征及来源解析[J]. 中国岩溶, 2013, 32(1): 79-87.
引用本文: 孙玉川, 沈立成, 袁道先. 表层岩溶带土壤中多环芳烃分布特征及来源解析[J]. 中国岩溶, 2013, 32(1): 79-87.
SUN Yu chuan, SHEN Li cheng, YUAN Dao xian. Distributing features and source analysis of polycyclic aromatic hydrocarbons in epikarst soils[J]. CARSOLOGICA SINICA, 2013, 32(1): 79-87.
Citation: SUN Yu chuan, SHEN Li cheng, YUAN Dao xian. Distributing features and source analysis of polycyclic aromatic hydrocarbons in epikarst soils[J]. CARSOLOGICA SINICA, 2013, 32(1): 79-87.

表层岩溶带土壤中多环芳烃分布特征及来源解析

基金项目: 重庆市科委院士专项(CSTS,2010BC7004)、国家自然科学基金项目(41072192)、西南大学博士基金项目(SWU110258)

Distributing features and source analysis of polycyclic aromatic hydrocarbons in epikarst soils

  • 摘要: 利用气相色谱-质谱联用仪(GC-MS)对表层岩溶泉域土壤中的16种优控的多环芳烃(Polycyclic Aromatic Hydrocarbons, PAHs)含量进行了分析,并对其组成、污染水平和来源进行了探讨。结果表明,16种优控PAHs在表层岩溶泉域土壤中的检出率为100%,其含量介于439.19~3329.72ng/g之间,平均值为1392.44ng/g,7种致癌性PAHs占总量的26%。PAHs的组成特征受地形的控制,随着海拔升高,低环PAHs所占比例升高,高环PAHs比例降低。同分异构体比值分析表明,研究区土壤中的PAHs主要来自于煤、生物质和石油的燃烧排放。研究区土壤中16种PAHs的TEQcarc值介于18.65~501.13ng/g,平均值为140.57ng/g。7种致癌性PAHs占总TEQcarc的比例达到96.8%。研究区表土中,后沟泉域的污染程度最大,次之是兰花沟泉域和柏树湾泉域,水房泉泉域的污染程度最小,但由于柏树湾泉域松针落叶中BaP、PAHs含量较高,松针落叶中PAHs含量分别高达36.36ng/g和2370.1ng/g,土壤生态风险评价中应考虑松针落叶层的潜在影响。

     

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  • 收稿日期:  2012-09-29
  • 刊出日期:  2013-03-25

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