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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Aerial Distribution,temperature-dependent Seasonal Variation,and Sources Of Polycyclic Aromatic Hydrocarbons In Pine Needles From The Houston Metropolitan Area,texas,usa
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Aerial Distribution,temperature-dependent Seasonal Variation,and Sources Of Polycyclic Aromatic Hydrocarbons In Pine Needles From The Houston Metropolitan Area,texas,usa

机译：美国得克萨斯州休斯顿都会区松针中的空中分布，温度相关的季节变化和多环芳烃的来源

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摘要

To investigate the aerial distribution,seasonal variation,and sources of polycyclic aromatic hydrocarbons (PAHs),pine needles were collected from 18 sites in the Houston metropolitan area,Texas,USA.Total PAHs ranged from 209 to 2,226 ng/g (dry wt.),which were similar to those found in other urban areas.The highest and lowest concentrations were found in samples from the inner city of Houston and the outer edge of suburban area,respectively.Aerial distribution of PAHs in pine needles was closely correlated to the proximity to densely occupied residential area and traffic volumes around sampling sites.Seasonal changes of PAHs in pine needles were inversely correlated with ambient temperature with lower levels in warmer months.Calculated concentrations of 3-ring PAHs in the air had a positive correlation with ambient temperature with higher levels in warmer months.Ratios of PAHs in pine needles to PAHs in the air decreased as ambient temperature increased because fugacity (escaping tendency) of PAHs in pine needles is grater in warmer months.The PAH patterns and ratios were fairly constant in all samples,indicating that the whole study area was influenced by the same emission sources,most importantly gasoline vehicle emission.Phenanthrenc was the predominant PAH and 3- and 4-ring PAHs were the most abundant in all samples,accounting for 79 to 97% of the total PAHs.The present study provides evidence that pine needle monitoring can be used as a good screening method to assess the atmospheric PAH contamination quickly and at low cost.
机译：为了调查空气分布，季节变化和多环芳烃（PAHs）的来源，从美国得克萨斯州休斯顿市区的18个地点收集了松针。总PAHs在209至2,226 ng / g之间（干重。 ），与其他城市地区相似。分别在休斯敦市中心和郊区外边缘的样品中发现最高和最低浓度。松针中PAHs的空气分布与空气中的PAHs密切相关。靠近密集居住区和采样点的交通流量。松针中PAHs的季节变化与环境温度呈负相关，在温暖的月份水平较低;计算出的三环PAHs浓度与环境温度呈正相关随着环境温度的升高，松散度（逃逸的趋势）会导致松针中PAHs与空气中PAHs的比率下降。 cy）在较温暖的月份会变松。所有样品中的PAH模式和比率都相当恒定，这表明整个研究区域受到相同排放源的影响，最重要的是汽油车排放物。菲是最主要的PAH其中，三环和四环多环芳烃含量最高，占总多环芳烃的79％至97％。本研究提供了证据，表明松针监测可作为评估大气多环芳烃污染的良好筛选方法快速且低成本。

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