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Studies have shown that sulfate is an important factor in the formation of haze. During heavy pollution, sulfate accounts for up to 20% of PM2.5 in the air, which is the highest percentage of monomer. With the increase of PM2.5 pollution, sulfate is the fastest growing component in the relative proportion of PM2.5.
The project "Measurement and evaluation of sulfate components in PM2.5" passed the acceptance
[China Instrument Network Instrument R&D] Recently, the “Specification and Evaluation of Sulfate in PM2.5†undertaken by the Fujian Provincial Science and Technology Institute's public welfare research institute has successfully passed acceptance.
The chemical reaction of nitrogen dioxide (NO2) and sulfur dioxide (SO2) in the water adsorbed by atmospheric fine particles is the main pathway for the production of sulfate in current haze. The tiny water particles in the air act as an incubator because it traps sulfur dioxide molecules and can interact with nitrogen dioxide to form sulfates. This process “self-magnifies†because increased aerosol mass concentration leads to increased aerosol water content, accelerating sulfate accumulation and causing more severe smog contamination.
The project established a method for the determination of sulfur dioxide in the air using surface-enhanced Raman spectroscopy signals. This method is fast and sensitive, and is of great significance for the identification of pollutants and the control of pollution sources.
(Original title: Provincial Department of Metrology, Special Provincial Science and Technology Agency's "Determination and Evaluation of Sulphate Composition in PM2.5" Accepted)