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Mass concentrations of BTEX inside air environment of buses in Changsha, China

机译：长沙公交车空气环境中BTEX的质量浓度

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摘要

In order to estimate the mass concentrations of benzene (B), toluene (T), ethylbenzene (E) and xylenes (X) inside air environment of buses and to analyze the influencing factors of the BTEX pollution levels, 22 public buses were investigated in Changsha, China. The interior air was collected through activated charcoal adsorption tubes and then the air samples were analyzed with thermally desorbed gas chro-matograph. The mass concentrations ranged from 21.3 to 106.4 ng/m3 for benzene, from 53.5 to 266.0 ng/ m3 for toluene, from 19.6 to 95.9 ug/m3 for ethylbenzene and from 46.9 to 234.8 ng/m3 for xylenes. Their mean values were 68.7,179.7, 62.5 and 151.8 ug/m3. respectively. The rates of buses tested where the interior concentrations exceeded the limit levels of Chinese Indoor Air Quality Standard were 45.5% for toluene and 13.6% for xylenes. The BTEX levels increased when in-car temperature or relative humidity rose, and decreased when car age or travel distance increased. The BTEX concentrations were higher in leather trims buses than in non-leather trims ones, in air-conditioned buses than in non-air-conditioned ones, and in high-grade buses than in low-grade ones. According to the analysis of multiple linear regression equation, car age and in-car temperature were two most important factors influencing the BTEX pollution levels in the cabins of public buses.
机译：为了估算公交车空气环境中苯（B），甲苯（T），乙苯（E）和二甲苯（X）的质量浓度，并分析影响BTEX污染水平的因素，共调查了22辆公交车。中国长沙。通过活性炭吸附管收集内部空气，然后用热脱附气相色谱仪分析空气样品。苯的质量浓度范围为21.3至106.4 ng / m3，甲苯的质量浓度范围为53.5至266.0 ng / m3，乙苯的质量浓度范围为19.6至95.9 ug / m3，二甲苯的质量浓度范围为46.9至234.8 ng / m3。其平均值分别为68.7、179.7、62.5和151.8 ug / m3。分别。当内部浓度超过中国室内空气质量标准的限值时，甲苯的测试率为45.5％，二甲苯的测试率为13.6％。当车内温度或相对湿度升高时，BTEX水平升高，而当车龄或行驶距离增加时，BTEX水平降低。皮革内饰客车中的BTEX浓度高于非皮革内饰客车，空调客车中的BTEX浓度高于非空调客车，高档客车中的BTEX浓度高于低档客车。根据多元线性回归方程的分析，车龄和车内温度是影响公交车厢内BTEX污染水平的两个最重要因素。

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  • 来源
    《Building and Environment》 |2011年第2期|p.421-427|共7页
  • 作者

    Xiaokai Chen; Guoqiang Zhang; Quan Zhang; Hong Chen;

  • 作者单位

    College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;

    College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;

    College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;

    College of Environmental Science and Engineering, Hunan University, Changsha 410082, Hunan, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    public buses; BTEX; mass concentration; indoor air quality;

    机译：公共巴士;BTEX;质量浓度室内空气质量;

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