Nuclear magnetic resonance method for distinguishing carbonaceous sources of carbonaceous aerosol components

Abstract

The invention discloses a nuclear magnetic resonance method for distinguishing carbonaceous sources of carbonaceous aerosol components. The nuclear magnetic resonance method comprises the steps of: acquiring biomass source aerosol, coal combustion emission aerosol and traffic emission (fossil source) aerosol samples from main sources of carbonaceous aerosol; analyzing three types of typical sourceaerosol carbon spectrums by utilizing solid nuclear magnetic resonance; carrying out data analysis, dividing functional groups into three types, namely sp3-hybridized alkyl C (0-60 ppm), sp2-hybridized carbon (100-165 ppm) and carbon oxide (60-100 ppm+165-220 ppm), and drawing a ternary point diagram by taking the three types as end members; and determining solid nuclear magnetic resonance carbonspectrum data of a carbonaceous aerosol component sample to be determined, analyzing a ternary linear equation according to data of the drawn ternary point diagram, and calculating proportions of allcarbonaceous sources of biomass sources, coal combustion emission and traffic emission in the carbonaceous aerosol component sample to be determined. The nuclear magnetic resonance method can distinguish the carbonaceous sources of the carbonaceous aerosol components, and provides favorable conditions for preventing and controlling the carbonaceous aerosol components.

Description

technical field [0001] The invention belongs to the field of geochemistry, and in particular relates to a nuclear magnetic resonance method for distinguishing carbonaceous sources of carbonaceous aerosol components. Background technique [0002] Carbonaceous aerosol components are important chemical components in atmospheric aerosols, contributing 10% to 70% of atmospheric fine particles (Lim and Turpin, 2002; Lonati et al., 2007). It has a significant contribution to air pollution and haze events. In addition, it contains a large number of toxic substances, which can directly endanger human health. It is one of the frontier topics in current atmospheric chemistry research (Highwood and Kinnersley, 2006; Nel, 2005). Carbonaceous aerosols contain thousands of organic compounds, generally including polycyclic aromatic hydrocarbons, normal alkanes, aldehydes, ketones, and carboxylic acids. Gas chromatography-mass spectrometry (GC-MS) can only characterize and quantify 10-40% o...

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Problems solved by technology

in nature 12 The spin quantum number of the C nucleus is zero, and the nuclear magnetic resonance signal cannot be observed, and the NMR signal can be observed by the isotope with a spin quantum number of 1 / 2 13 C, but its abundance in nature is low, accounting for only 1.1% of the total carbon, 13 The observation sensitivity of C NMR signal is only 1 / 5700 of proton

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