A system for efficient self-cleaning online measurement of active oxygen free radicals in atmospheric particulates

Abstract

The invention discloses a system for efficient self-cleaning online measurement of active oxygen free radicals in atmospheric particulates. The system comprises an online atmospheric particulate collection part, a fluorescence measurement instrument and an exhaust assembly; the on-line atmospheric particulate collection part comprises a particulate growth chamber, a steam generator, a steam spraypipe, a plurality of liquid cooling pipes and a cyclone collector; an atmospheric sample and water vapor are mixed at a gas inlet of the particulate growth chamber; the inner wall of the particulate growth chamber is coated with a cerium oxide modified nano hydrophobic coating; an inlet of the cyclone collector is communicated with an outlet of the particulate growth chamber; a fluorescence determination liquid inlet is formed in the inlet of the cyclone collector; the mixture is separated into gas and a collected liquid in the cyclone collector; the gas is exhausted through the exhaust assembly; the collected liquid is discharged from a liquid outlet of the cyclone collector, and the collected liquid is detected by the fluorescence measurement instrument to obtain the concentration of thereactive oxygen free radicals in the atmospheric particulates in the collected liquid. The system has the advantages of high efficiency, self-cleaning, accuracy and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection measurement, and relates to a system for online measurement of active oxygen free radicals in atmospheric particles, in particular to an efficient self-cleaning system for online measurement of active oxygen free radicals in atmospheric particles. Background technique [0002] Atmospheric particulate matter can be divided into PM10, PM2.5, and PM1.0 according to particle size. Particles with a particle size smaller than 2.5 microns are called inhalable particulate matter, which is closely related to human health because of its small particle size and easy entry into the human respiratory tract. In the past 20 years, a large number of scholars have successively used free radical theory to explore the pathogenic effect of particulate matter, detected the existence of free radicals and free radical reactions in particulate matter, and found through a large number of in vivo and in vitro experim...

AI Technical Summary

Problems solved by technology

The main problem: requires a high-precision microbalance (generally requires a balance with a precision of more than one hundred thousandth of a gram)

[0006] In addition, in the process of measuring the active oxidation free radicals of atmospheric particulate matter, it is easy for the particulate matter to attach to the inner wall of the measuring device, causing sample loss and affecting the measurement accuracy.

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