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A NMR method for distinguishing carbonaceous origins of carbonaceous aerosol components

A nuclear magnetic resonance and aerosol technology, applied in the direction of nuclear magnetic resonance analysis, etc., can solve problems such as low abundance and unobservable nuclear magnetic resonance signals, and achieve the effect of raising awareness

Active Publication Date: 2022-04-22
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 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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  • A NMR method for distinguishing carbonaceous origins of carbonaceous aerosol components
  • A NMR method for distinguishing carbonaceous origins of carbonaceous aerosol components
  • A NMR method for distinguishing carbonaceous origins of carbonaceous aerosol components

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Embodiment 1

[0017] 1. By simulating the real situation, samples of 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, are collected. Sample P1 was prepared according to Table 1 (the carbon proportion of three typical carbonaceous aerosol samples).

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

[0019] Sample C% (biomass) C% (motor vehicle) C% (coal) P1 56 15 28

[0020] 2. Utilize 400MHz solid-state nuclear magnetic resonance to analyze 3 types of typical source aerosols in step 1 ( figure 1 ) and the carbon spectrum of the prepared sample P1 ( image 3 ), for data analysis, the functional groups were divided into sp3-hybridized alkyl C (0-60ppm), sp2-hybridized carbon 100-165ppm) and carbon dioxide (60-100ppm+165-220ppm) three types (Table 2), using...

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Abstract

The invention discloses a nuclear magnetic resonance method for distinguishing carbonaceous sources of carbonaceous aerosol components. Collect samples of biomass source aerosol, coal combustion emission aerosol, and traffic emission (fossil source) aerosol samples that are the main sources of carbonaceous aerosols, and use solid-state nuclear magnetic resonance to analyze the carbon spectra of three types of typical source aerosols for data analysis. Divided into sp3-hybridized alkyl C (0-60ppm), sp2-hybridized carbon 100-165ppm) and carbon dioxide (60-100ppm+165-220ppm), with these three categories as end members, Make a ternary point diagram; measure the carbonaceous NMR spectrum data of the carbonaceous aerosol component sample to be tested, and analyze the ternary linear equation according to the above ternary point diagram data to calculate the carbonaceous aerosol component to be measured. The proportion of each carbonaceous source of biomass sources, coal combustion emissions, and traffic emissions in the aerosol component samples. The invention can distinguish the carbon 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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