太原盆地某农田土壤中多环芳烃的分布特征

摘要

This study investigAted the levels And distribution chArActeristics of PAHs in different depths of Agricul-ture soils collected from TAiyuAn bAsin. The results indicAted thAt the AverAge concentrAtions of Σ16-PAHs in the top soils(209. 63 μg·kg-1 )were higher thAn those in deeper ones. The AverAge concentrAtions of Σ16-PAHs soils from the depth of 20-40 cm(38. 98 μg·kg-1 )were lower thAn those from the depth of 40-60 cm(107. 06 μg·kg-1 ). The concentrAtions of Σ16-PAHs in the top soils decreAsed from upstreAm to downstreAm of Wenyu River. PAHs in soils from different depths showed the following order:3-ring PAHs > 4-ring PAHs > 5-ring PAHs > 6-ring PAHs > 2-ring PAHs. For the individuAl PAHs,phenAnthrene hAd the highest concentrAtion,while AcenAphthylene hAd the lowest concentrAtion. The results of source AnAlysis indicAted thAt PAHs in 0-20 cm And 20-40 cm soils were similAr,And probAbly cAme from petroleum,petroleum And coAl/ biomAss combustion. For PAHs in 40-60 cm soils derived be-sides from petroleum,petroleum And coAl/ biomAss combustion,it wAs mAinly from petroleum input which might be relAted to the leAkAge of petroleum.%本研究以太原盆地某地农田土壤为研究对象，报道了不同深度的土壤中多环芳烃（ PAHs）的污染水平及分布规律。结果表明表层土壤（0~20 cm）中16种 PAHs（Σ16-PAHs）总浓度最高，平均值为210μg·kg-1，其次是40~60 cm，平均值为107μg·kg-1，20~40 cm 土壤中Σ16-PAHs 最低，平均值为39μg·kg-1.各深度土壤中不同环数的 PAHs 浓度水平为3环 PAHs >4环 PAHs >5环 PAHs >6环 PAHs >2环 PAHs；对于 PAHs 单体来说，菲含量水平最高，而苊烯含量水平最低.特征比值分析结果表明0~20 cm 和20~40 cm 土壤中 PAHs 来源基本一致，可能有石油源的输入以及石油、煤和生物质等的燃烧，而40~60 cm 土壤中 PAHs 除了有石油、煤和生物质燃烧源以外，受石油源输入的影响更大，可能与石油产品泄露有关。