Related Experiment Video
Updated: Jan 1, 2026
08:59
Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
Published on: May 22, 2020
5.8K
[Measuring the Condensable Particle Matter from a Stationary Source].
Jing-Kun Jiang1,2, Jian-Guo Deng1, Gang Wang1
1School of Environment, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue= Huanjing Kexue
|December 20, 2019
Summary
Condensable particle matter (CPM) emissions are increasingly important as filterable particle matter decreases. The indirect dilution method accurately measures CPM from industrial sources, unlike the US EPA method 202 which overestimates levels.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Industrial Emissions
Context:
- Ultra-low emission controls are reducing filterable particle matter (FPM) from coal and steel plants.
- Condensable particle matter (CPM) is gaining attention due to limited understanding of its emission concentration and chemical characteristics.
- China currently lacks a standard method for determining CPM.
Purpose:
- To compare three methods for measuring CPM emissions: dry impinger method (US EPA method 202), indirect dilution, and direct dilution.
- To evaluate these methods for coal-fired power plants, coke-making plants, and sintering plants.
- To identify a reliable method for CPM determination in China.
Summary:
- The US EPA method 202 overestimates CPM because gaseous HCl or SO2 dissolve into the sample and are not fully removed by N2 purging.
- The indirect dilution method provides a more accurate representation of actual CPM emissions into the atmosphere.
- Direct dilution method was also evaluated.
Impact:
- Provides a more accurate method for assessing CPM emissions from major industrial sources.
- Informs the development of national standards for CPM determination in China.
- Contributes to better air quality management and pollution control strategies.
