• 关键词：PAHs  降尘  季节变化  天津地区

• 基金项目：国家自然科学基金项目(400332015;40024101)资助

• 吴水平
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 兰天
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 左谦
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 刘文新
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 曹军
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 李本纲
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 徐福留
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 沈伟然
• 天津市环境保护局,天津300191

• 秦保平
• 天津市环境保护局,天津300191

• 孙韧
• 天津市环境保护局,天津300191

• 张文具
• 天津市环境保护局,天津300191

• 陶澍
• 北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

• 摘要：采集并分析了天津地区2002～2003年16区县23个样点采暖与非采暖期降尘样品中16种优控多环芳烃(PAHs)含量。 非采暖期样品16种PAHs含量总和(ΣPAH₁₆)在1.00～48.18μg·g^-1间, 采暖期样品ΣPAH₁₆在2.54～85.47μg·g^-1间。 采暖期降尘高含量PAHs主要为萘、菲、荧蒽、和芘, 非采暖期降尘PAHs的优势成份包括萘、芴、菲、荧蒽和。 除东部工业区外, 同一样点采暖期降尘中高环

• Abstract：Atmospheric dustfall collected from 23 locations in Tianjin, China during non-heating and heating seasons from Match 2002 to Match 2003 was analyzed for 16 polycyclic aromatic hydrocarbons (PAHs). The sums of 16 PAH compounds (ΣPAH₁₆) in the dustfall were in the ranges from 1.00 to 48.2μg·g^-1 and from 2.54 to 85.5μg·g^-1 for non-heating and heating seasons, respectively. Five compounds were predominant: naphthalene, phenathrene, fluoranthen, chrysene and pyrene, which represented 71%～87% of the total PAH concentration in the dustfall samples collected from heating season. The six potential carcinogenic PAHs as described by the International Agency for Research on Cancer (IARC) (i.e. BaA, BbF, BkF, DBA, and IncdP) represented on average 27.3% of the total PAHs, of which 3.6% was BaP. Five compounds (naphthalene, fluorine, phenathrene, fluoranthene and chrysene) dominated the non-heating samples, and the sum of these compounds represented 31%～88% of ΣPAH₁₆. The sum of six potential carcinogenic PAHs also represented on average 27.3% of ΣPAH₁₆, and BaP was 3.5%. The concentrations of most individual PAH compounds in heating samples were higher than those of non-heating samples at the same sites except those samples collected from east industrial area of Tianjin. The same phenomena were observed for high molecular weight PAHs with 4 to 6 rings and the six compounds described by IARC. The concentration levels of PAHs in Tianjin dustfall were controlled mainly by the different locations, although the exposed time may have some influences on the concentrations and profiles of 16 PAHs. The correlations among individual PAH compounds in the heating season dustfall were more significant than those of the non-heating season samples. Trilinear comparison of 3-, 4-and 5&6-ring PAHs in the non-heating dustfall was more discrete than that of heating dustfall. The ratios of Pyr/BaP and Flua/Pyr in the dustfall samples indicated that the contribution of coal combustion was the main source of PAHs in both of heating and non-heating samples. The combustion of coal contributed more PAHs to heating season dustfall samples than non-heating samples, while the traffic source contributed more PAHs to non-heating dustfall.

• Key words：PAHs  dustfall  seasonal variation  Tianjin area

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  摘要点击次数： 2005 全文下载次数： 2451