Device and method for on line concentrating and collecting atmospheric aerosol and measuring small molecular organic acid

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a device and method for on line concentrating and collecting atmospheric aerosol and measuring small molecular organic acid. The device comprises a float flowmeter, a concentrated airflow vacuum pump, a main airflow vacuum pump, a drying pipe, a mass flow controller, a collision type PM2.5 cutting head, a condensation system machine, a water tank, an electric heating rod, a virtual cutter, a biological sampling bottle, two micro-injection pumps, an automatic sampler, an inductively coupled plasma mass spectrometer and the like. According to the device, particulates are blended into liquid through links of sampling, condensation, concentration and the like, so that the concentration of the particulates is improved by one order of magnitude, the concentration effect is better than that of similar products, and the problems of sample pollution, high reagent loss and the like in a traditional filter membrane collection monitoring method are effectively avoided; and the concentration technology and an ultrahigh pressure liquid chromatography time-of-flight mass spectrometer are combined to measure the small molecular organic acid, the detection rate can be greatly increased, the sampling time can be greatly shortened, and the device and method can be widely applied to environment monitoring.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and method for concentrated collection and online measurement of atmospheric aerosol. Background technique [0002] PM2.5 refers to particulate matter in the atmosphere with an aerodynamic equivalent diameter less than or equal to 2.5 microns, also known as inhalable particulate matter. Although PM2.5 is only a small component in the earth's atmosphere, it has an important impact on air quality and visibility. Atmospheric PM2.5 has a small particle size and a large specific surface area. It is easy to enrich toxic and harmful chemical components such as heavy metals, water-soluble inorganic ions, and organic substances, and it has a long suspension time in the atmosphere and a long transmission distance. Negative effects cannot be ignored. [0003] In recent years, my country's atmospheric PM2.5 pollution has been serious, resulting in a sh...

AI Technical Summary

Problems solved by technology

However, the determination of small molecular organic acids in atmospheric particulate matter is still in the offline detection stage due to the constraints of detection technology and instruments (such as high detection limit), and it needs to be carried out under the conditions of heavy pollution and long continuous sampling time

Off-line analysis requires a cumbersome concentration and enrichment process and easily causes sample loss, which cannot meet the technical requirements of real-time monitoring

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