ATMOS ENVIRON:通勤路上的你可能遭遇了更多PM2.5

2017-07-25 海北 MedSci原创

现代生活中,奔忙在路上的上班族们难免和交通尾气来个亲密接触。不少报导显示交通尾气对人们健康有负面的影响,但是至今为止,很少有研究直接设身处地地在车内测量空气污染程度,对于日常通勤中人们在交通尾气中的暴露情况也知之甚少。

现代生活中,奔忙在路上的上班族们难免和交通尾气来个亲密接触。不少报导显示交通尾气对人们健康有负面的影响,但是至今为止,很少有研究直接设身处地地在车内测量空气污染程度,对于日常通勤中人们在交通尾气中的暴露情况也知之甚少。

近日,来自杜克大学的研究人员在高峰通勤时段收集了高速公路和非高速公路的小道上面的样品,评估了车内PM2.5的水平。该研究隶属于亚特兰大通勤暴露(ACE)研究。研究人员使用二硫苏糖醇(DTT)测定法分析了来自PM2.5过滤器的水溶性提取物的氧化电位。

结果显示,新鲜的尾气中可能存在着大量气相DTT活性物质。研究人员还发现,其测量得到的DTT活性平均比路边固定监测站的测量值高出两倍。由于石英滤波器采样持续时间相对较短(2小时),可能会造成实验结果的误差。但是研究人员目前的结果还是说明,在路上的通勤者可能会更多地暴露在具有氧化还原活性的PM2.5中。此外,研究人员也在水溶性DTT活性和水溶性有机碳(WSOC)之间观察到了强相关性,特别是“半挥发性”水溶性有机碳组分。

因此,研究人员的这些结果表明半挥发性有机物质是DTT活性的重要贡献者,至少在PM2.5以车辆来源为主的环境中。


原始出处:

Heidi Vreeland et al. Oxidative potential of PM 2.5 during Atlanta rush hour: Measurements of in-vehicle dithiothreitol (DTT) activityAtmospheric Environment, 2017; 165: 169 DOI: 10.1016/j.atmosenv.2017.06.044


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    2017-08-05 jacob9231

    学习了谢谢分享

    0

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    2017-07-27 july_979
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    2017-07-26 131****2916

    不错的文章值得学习

    0

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    2017-07-26 189****1577

    值得推荐一下

    0

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    2017-07-26 惠映实验室

    学习了,谢谢

    0

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