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[Evaluation and Development of a Weighing Chamber by Using Saturated MgCl2 Solution].
Xiao-Xiao Li1, Qiang Zhang1, Jian-Guo Deng1
1School of Environment, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
Summary
Accurate measurement of atmospheric particles is crucial. A new weighing chamber maintains stable relative humidity (RH), ensuring precise filter weighing with minimal deviation, crucial for air quality studies.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Atmospheric Science
Context:
- Atmospheric particle studies in China are vital due to significant air pollution.
- Accurate weighing of filters is essential for reliable particle mass concentration measurements.
- Existing methods may lack stability or be cost-prohibitive.
Purpose:
- To develop and evaluate a weighing chamber for precise filter weighing under controlled relative humidity (RH).
- To establish an optimal RH range (30%-40%) for filter weighing.
- To assess the stability and accuracy of the developed weighing system.
Summary:
- A weighing chamber (1.2 m×0.6 m×0.8 m) was designed using saturated MgCl2 solution and a flow control system to maintain constant RH.
- The system was validated by weighing blank and aerosol-enriched filters, determining 30%-40% RH as optimal.
- The chamber maintained a stable RH (30.1%-34.0%) for a month, achieving a standard deviation of ≤0.02 mg for filter weighing after 24-hour equilibration.
Impact:
- Provides a simple, stable, and cost-effective method for accurate atmospheric particle filter weighing.
- Enhances the reliability of air quality monitoring data in China and globally.
- Facilitates more precise research on atmospheric particle impacts and control strategies.
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