Determination method of organic amine in atmosphere PM2.5

Abstract

The invention discloses a determination method of organic amine in atmospheric particulates. The method comprises the following steps: S1, preparing a standard solution; S2, pretreating a sample; S3,deriving; S4, extracting and concentrating; and S5, qualitatively and quantitatively analyzing. A method for quickly and simply determining the amine substance in the atmospheric particulates is established. In the derivatization process of the method, an operation of adding other reagent as the catalyst is avoided, and the derivatization can be accomplished by only stirring at normal temperatureunder an alkali condition, and is time-saving and simple in operation. The warming program is optimized, the qualitative and quantitative ions of six aromatic amines (methylamine, the dimethylamine, the ethylamine, the diethylamine, the propylamine and the butyl amine) are determined; and the method is applied to the determination of amine substance in the actual atmospheric particulates, and thetechnical support is provided for further developing the research on the organic amine substance environment behavior in the aerosol.

Description

technical field [0001] The invention relates to the field of atmospheric chemical analysis, in particular to a method for determining organic amines in atmospheric PM2.5. Background technique [0002] Organic amine pollutants, a subset of water-soluble organic nitrogen (WSON), have received increasing attention in recent years for their potential to affect new particle formation and cloud chemistry. Organic amines are alkaline gases that widely exist in the atmosphere and have unique acid neutralization capabilities, but their thermodynamic and kinetic properties are difficult to obtain due to their low abundance, complex sources and short atmospheric residence time. Low molecular weight organic amines, mainly present in the atmosphere, have high vapor pressure and high water solubility, which can affect the hygroscopicity of aerosols. Amines are produced from alkyl or aryl groups by substituting hydrogen atoms on ammonia molecules, so amines have the same properties as amm...

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Problems solved by technology

Among them, the sensitivity of gas chromatography and ion chromatography is low, and it is difficult to completely separate the organic amines with low molecular weight and relatively similar structure; although liquid phase mass spectrometry has high sensitivity, it is expensive, easy to residue and difficult for operation. Higher requirements for personnel; liquid chromatography and gas phase mass spectrometry are currently the more commonly used methods for the determination of atmospheric organic amines, but both require derivatization to reduce the polarity of the target compound and improve the selectivity and sensitivity of the target compound. Methods are often cumbersome to operate, take a long time to derive, and have poor reproducibility

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