A method for analyzing the source of sulfate in atmospheric particulate matter based on sulfur isotope

Abstract

The invention discloses a method for analyzing sulfate sources in atmospheric particulate matter based on sulfur isotopes. The method comprises the following steps that (1) emission sources and winterambient air PM2.5 samples are collected; (2) sulfur isotope compositions in the samples are detected through an MAT-253 isotope mass spectrometer, and an ion chromatograph is used for analyzing ioniccomponents in soil raised-dust particles, biomass combustion emission particles and atmospheric particles; (3) a potential aerosol mass (PAM) is used for studying the sulfur isotope distillation characteristics in the process that SO2 is oxidized into SO4<2->; and (4) on the basis of the step (1) to step (3), the method for analyzing the sulfate sources in the atmospheric particulate matter basedon the sulfur isotopes is established, and primary emission contributions of fire coal and soil raised dust and contributions of fire coal, motor vehicle and biomass combustion emission on secondarysulfate are analyzed. The method has the important scientific significance and important application and promotion value, the new idea is developed for analyzing and studying the atmospheric particulate matter, and the new method is established for analyzing and studying the source of the atmospheric particulate matter.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a sulfur isotope-based method for analyzing the source of sulfate in atmospheric particulate matter. 2 and based on sulfur isotopic studies of particulate sulfate, combined with SO 2 Study on the characteristics of sulfur isotope fractionation in the conversion process, establish a sulfur isotope-based analysis method for the source of sulfate in atmospheric particulate matter, and analyze the contribution value of the primary emission and secondary conversion of sulfate in atmospheric particulate matter. Background technique [0002] Haze pollution has become one of the most serious environmental problems facing our country. Fine particulate matter (PM 2.5 ) is the main factor causing smog. Sulfate (SO 4 2- ) is PM 2.5 The main components of PM during haze periods in northern cities in my country 2.5 The proportion in can be as high as 40%. It ...

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Problems solved by technology

Existing literature has preliminarily studied SO by means of laboratory simulations. 4 2- Fractionation of sulfur isotopes during formation, such as SO at 25°C 2 The fractionation coefficients of sulfur isotope in the heterogeneous reaction and homogeneous reaction conversion process are 1.065 and 0.991, respectively, and at 19 °C with H 2 o 2 and O 3 The fractionation coefficients of homogeneous reaction and catalyzed are 1.0167 and 0.9894, respectively. In addition, SO 2 δ for each 1°C increase in the oxidation process 34 The value of S increases by 0.08 to 0.15‰, and there is a complex exponential relationship between the isotope fractionation coefficient and atmospheric pressure, and the humidity will greatly increase the isotope fractionation coefficient, but no adaptation to the simulated environment has been found. 2 converted to SO 4 2- Correlative research on the characteristics of sulfur isotope fractionation considering temperature, humidity, atmospheric pressure and other factors in the process

At present, the few studies considering the existence of isotope fractionation in the transformation process are only partly using the empirical parameters in other studies for qualitative discussion, and there is no quantitative discussion on the impact of the fractionation process on the source analysis of sulfate, resulting in inaccurate analysis results

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