Scholarlink

<p>Volatile organic compounds (VOCs) emitted by building materials pose severe health risk. It is critical to identify major pollution sources for consequent intervention. An <i>in-situ</i> sampling method is introduced in this study to determine solid-gas interface concentrations of building materials to help realize source apportionment with minimal disturbance and cost. The method is featured as an upended cylindrical chamber with two openings. A sampling flow rate lower than a critical value allows diffusion-controlled environment in the chamber and concentration equilibrium between building surfaces and the air. It is validated by tests under various sampling flow rates (difference of 2%–11%) and in an enclosed chamber (difference of 4.7%–14%). Flow field analysis shows that air speed in the chamber is lower than 0.001 m/s and Reynolds number is smaller than 0.5, confirming the diffusion nature. Results indicate that a chamber with large bottom area and/or low height could have high acceptable sampling flow rate, which would reduce sampling time needed. A field test demonstrated that the method can reasonably help reconstruct pollution field and capture interface concentrations change along with temperature. The proposed <i>in-situ</i> method could facilitate better diagnose indoor air pollution by quantifying source contributions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

In-situ sampling method to measure interface pollutants concentrations of volatile organic compounds from building materials

  • 期刊论文

  • 发表日期：

    2025年7月3日

查看全文
  • Siming Shi,
  • Yixin Liu,
  • Zilong Deng,
  • Jin Ye,
  • Zhiyuan Wang,
  • Tao Yu,
  • Ying Song,
  • Minhao Mu,
  • Jingguang Li,
  • Zhen Ding,
  • Ying Xu,
  • Jingjing Fang,
  • Cong Liu

摘要

Volatile organic compounds (VOCs) emitted by building materials pose severe health risk. It is critical to identify major pollution sources for consequent intervention. An in-situ sampling method is introduced in this study to determine solid-gas interface concentrations of building materials to help realize source apportionment with minimal disturbance and cost. The method is featured as an upended cylindrical chamber with two openings. A sampling flow rate lower than a critical value allows diffusion-controlled environment in the chamber and concentration equilibrium between building surfaces and the air. It is validated by tests under various sampling flow rates (difference of 2%–11%) and in an enclosed chamber (difference of 4.7%–14%). Flow field analysis shows that air speed in the chamber is lower than 0.001 m/s and Reynolds number is smaller than 0.5, confirming the diffusion nature. Results indicate that a chamber with large bottom area and/or low height could have high acceptable sampling flow rate, which would reduce sampling time needed. A field test demonstrated that the method can reasonably help reconstruct pollution field and capture interface concentrations change along with temperature. The proposed in-situ method could facilitate better diagnose indoor air pollution by quantifying source contributions.