A method for extracting and analyzing water-soluble and water-insoluble organic matter in atmospheric fine particles

A technology for water-soluble organics and fine particles in the atmosphere, applied in the analysis of materials, material analysis and sampling by electromagnetic means, etc., can solve problems such as lack of in-depth understanding, achieve high accuracy, high resolution, and avoid loss.

Active Publication Date: 2021-09-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

As a result, there is a lack of in-depth knowledge of the precise organic chemical composition, molecular weight, and isotopic distribution of atmospheric particulate matter

Method used

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  • A method for extracting and analyzing water-soluble and water-insoluble organic matter in atmospheric fine particles
  • A method for extracting and analyzing water-soluble and water-insoluble organic matter in atmospheric fine particles
  • A method for extracting and analyzing water-soluble and water-insoluble organic matter in atmospheric fine particles

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Embodiment Construction

[0029] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] Collect atmospheric fine particles, cut the sampling filter membrane 3cm×3cm (about 60m 3Air volume, 3.6 mg of atmospheric fine particles) were placed in a 15 mL glass centrifuge tube, 5 mL of ultrapure water was added, and ultrasonically extracted for 40 min. After filtering with a 0.45 μm water-based filter membrane, pass through an SPE column whose matrix is ​​a divinylbenzene polymer. The SPE column is first activated with 3 mL of methanol and rinsed with 3 mL of water. The pH of the extract is adjusted to 2 with hydrochloric acid (1mol / L). , and then loaded on the SPE column, rinsed with 3mL ultrapure water and sucked dry, eluted twice with 3mL of methanol, and the eluate was nearly dry at 40°C, and finally methanol / water (1:1v / v) Dilute to 1mL, store in a refrigerator at -20°C for testing, and analyze water-soluble organi...

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Abstract

The invention discloses a method for extracting and analyzing water-soluble and water-insoluble organic matter in atmospheric fine particles. The final extract was filtered with a 0.45 μm filter membrane, blown to near dryness with nitrogen gas, and then adjusted to volume with methanol / water (1:1, v / v) and methanol / toluene (1:1, v / v) solutions, respectively. Using a 15T Fourier transform ion cyclotron resonance mass spectrometer (15T FT-ICR MS) combined with an electrospray ionization source (ESI) and an atmospheric pressure photoionization source (APPI) in the positive and negative ion mode, the atmospheric fine particles were detected by direct sampling. Analyze the organic components of organic compounds and analyze the composition characteristics of organic compounds at the molecular level. Compared with conventional methods, this method has the advantages of simple and fast pretreatment, and can build a high-throughput detection technology and massive data processing system for organic components of atmospheric fine particles through the high-resolution characteristics of FT-ICR MS, so that comprehensive information can be obtained. .

Description

technical field [0001] The invention belongs to the field of atmospheric organic matter analysis and identification, and relates to a method for extracting water-soluble and water-insoluble organic components in atmospheric fine particles and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICRMS) technology based on high resolution and high accuracy Analytical methods for the molecular composition of organic matter. Background technique [0002] Atmospheric particulate matter is the pollutant with the most complex chemical composition and the greatest harm in the atmospheric environment. It has become one of the main hazards affecting the quality of the atmospheric environment and human health. It can also cause reduced visibility, climate change and other environmental effects. The sources of atmospheric particulate matter are complex, including fixed emission sources (such as thermal power plants, mining areas, etc.) and unorganized emission sources (such a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62G01N27/64G01N27/68G01N1/34G01N1/40
CPCG01N27/62G01N27/64G01N1/34G01N1/4055G01N2001/4061
Inventor 宁翠萍陈吉平高媛张海军于浩然
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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