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Metallic elements and Pb isotopes in PM2.5 in three Chinese typical megacities: spatial distribution and source
1Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China. xuhongmei@xjtu.edu.cn.
Environmental Science. Processes & Impacts
|July 17, 2020
Summary
Heavy metal pollution in fine particulate matter (PM2.5) is a major concern in China. Changchun shows higher PM2.5 elemental concentrations, driven by industrial and vehicular sources, alongside regional dust transport.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Public Health
Background:
- Heavy metal pollution in fine particulate matter (PM2.5) poses significant environmental and health risks in China, especially during winter.
- Understanding elemental composition and sources of PM2.5 is crucial for developing effective pollution control strategies.
Purpose of the Study:
- To investigate the spatial variations, sources, and regional transport of elements in PM2.5 across three major Chinese cities: Beijing, Changchun, and Chengdu.
- To differentiate the contributions of local emissions (industrial, vehicular, coal combustion) and regional dust to PM2.5 elemental profiles.
Main Methods:
- Collection and analysis of 24-hour integrated PM2.5 samples from Beijing, Changchun, and Chengdu in January 2014.
- Detection of 40 elements in PM2.5 samples.
- Utilizing elemental ratios and lead (Pb) isotope analysis to identify pollution sources.
Main Results:
- Changchun exhibited significantly higher PM2.5 elemental concentrations compared to Beijing and Chengdu.
- Industrial emissions (iron/steel, automotive) were major contributors in Changchun, while vehicular emissions were more dominant in Beijing (besides coal combustion).
- Crustal dust from long-range regional transport significantly influenced PM2.5 elemental levels in Beijing and Changchun (over 50% source intensity). Anthropogenic dust from construction was noted in Chengdu.
Conclusions:
- PM2.5 elemental profiles and sources vary significantly across Chinese metropolises.
- Regional dust transport is a critical factor influencing PM2.5 composition in Northern China.
- Targeted strategies are needed for different cities, considering local industrial/vehicular emissions and regional transport impacts on heavy metal pollution.
