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

A nuclear magnetic resonance and aerosol technology, applied in the direction of using nuclear magnetic resonance for analysis, etc., can solve the problems of low abundance and unobservable nuclear magnetic resonance signals, and achieve the effect of improving understanding

Active Publication Date: 2020-01-03
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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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 sp

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

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[0016] Example 1:

[0017] 1. Through the simulation of the actual situation, collect biomass source aerosol (biomass), coal combustion emission aerosol (coal) and traffic emission (fossil source) aerosol (motor vehicle) samples, which are the main sources of carbonaceous aerosol. According to Table 1 (the proportion of carbon in the three typical carbonaceous aerosol samples), sample P1 was prepared.

[0018] Table 1 The proportion of carbon in 3 typical carbonaceous aerosol samples of the proportioning samples

[0019] Sample C% (biomass) C% (motor vehicle) C% (coal burning) P1561528

[0020] 2. Use 400MHz solid-state nuclear magnetic resonance to analyze the 3 types of typical source aerosols in step 1 ( figure 1 ) And the carbon spectrum of prepared sample P1 ( image 3 ), perform data analysis and divide the functional groups into sp3-hybridized alkyl C (0-60ppm), sp2-hybridized carbon 100-165ppm) and carbon oxide (60-100ppm+165-220ppm) (table 2) Using these three categorie...

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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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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 张向云李军张干
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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