太原市采暖期大气PM_(2.5)中多环芳烃的污染特征
Pollution Characteristics of Polycyclic Aromatic Hydrocarbons in PM_(2.5) during the Heating Season in Taiyuan City,China
查看参考文献26篇
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文摘
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本研究对太原市采暖期PM_(2.5)中多环芳烃(PAHs)的污染水平、组成特征、健康风险以及来源进行了分析。结果表明,太原市采暖期PM_(2.5)的日均浓度水平为70.7~274.2μg/m~3,90%的样品超过了我国《环境空气质量标准》(GB 3095-2012)中PM_(2.5)的二级标准限值(75μg/m~3)。PM_(2.5)中16种PAHs的浓度水平为282.7~1 398.6ng/m3,平均值为915.7ng/m~3。荧蒽(Fla)是浓度最高的单体,占PAHs总浓度的20.4%,其次是芘(Pry)和菲(Phe),分别占14.5%和13.2%。不同环数的PAHs质量浓度为4环>5~6环>2~3环。以苯并(a)芘(Bap)为参照对象的昼夜毒性当量浓度Bapeq分别为75.5和100.0ng/m~3,高于我国和WHO对Bap的规定值(分别为2.5和1ng/m~3),对人体健康存在潜在危害。根据PAHs环数分布及特征比值法判断PAHs的主要来源是煤燃烧,同时也存在一定的生物质燃烧和少部分石油燃烧。 |
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其他语种文摘
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This study investigated the concentration, composition, health risk and sources of PAHs in PM_(2. 5) sampled during the heating season in 2012 in Taiyuan City, China. The daily average concentration of PM_(2.5) ranges from 70. 7 to 274. 2μg/m~3, and 90% of the samples exceeded the Grade II standard value of daily concentration of PM_(2. 5) (75μg/m~3) according to China’s “Ambient Air Quality Standards”(GB3095-2012). The concentrations of Σ16-PAHs in PM_(2. 5) range from 282. 7 to 1 398. 6 ng/m~3, with average concentration of 915. 7ng/m~3. The Fla is the most abundant of PAHs, accounting for 20. 4% of Σ16-PAHs, followed by Pry and Phe, accounting for 14. 5%and 13. 2%, respectively. The concentrations of PAHs based on ring numbers are ranked as 4rings>5-6rings>2-3rings. The toxicity equivalence concentrations(Bap_(eq))using benzo[a]pyrene (Bap)as the primary representative for PAHs are 75. 5ng/m~3 in the day and 100. 0ng/m~3 in the night, higher than the recommended safety standards of China and WHO(2. 5and 1ng/m~3), indicating the potential risk of PAHs to human health. Rings distribution and the diagnostic ratios of PAHs indicate that PAHs in Taiyuan City are primarily derived from coal combustion, and also with small part from biomass combustion and petroleum combustion. |
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来源
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地球与环境
,2015,43(2):198-204 【核心库】
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关键词
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太原
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PM_(2.5)
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多环芳烃
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污染特征
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地址
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1.
太原科技大学环境与安全学院, 太原, 030024
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510630
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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环境污染及其防治 |
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基金
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国家自然科学基金
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国家教育部重点项目
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山西省青年科技基金
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山西省回国留学人员科研项目
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文献收藏号
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CSCD:5385700
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