Equipment and method for automatically detecting mass concentration of organic carbon/elemental carbon in atmospheric aerosol

Abstract

The invention discloses equipment and a method for automatically detecting mass concentration of organic carbon / elemental carbon in atmospheric aerosol. The method comprises the following steps of: firstly, collecting particles to be detected on a quartz filter film; and heating the quartz filter film loaded with the particles in the environment of He gas, taking the carbon volatilized during the temperature rise as the organic carbon, heating the quartz filter film in the environment of He / O2 carrier gas, during which the elemental carbon is oxidized, decomposed and escapes. Through the whole process, a laser beam is irradiated on the quartz film, the transmission light of the laser beam is weakened in the carbonization of the organic carbon and strengthened in the oxidizing decomposition of the elemental carbon. The dividing point of the organic carbon and the elemental carbon is decided at the time when the transmission light of the laser beam recovers the original optical intensity, namely the carbon detected before the time is taken as the organic carbon, and the carbon detected after the time is taken as the elemental carbon. The equipment consists of the quartz filter film, a combustion furnace, an oxidation furnace, a CO2 detector, and a laser detection unit. The method realizes detecting the mass concentration of the organic carbon / elemental carbon in the atmospheric aerosol more scientifically and accurately.

Description

technical field [0001] The invention relates to the field of environmental detection, and is a device and a method for automatically measuring the mass concentration of organic carbon / elemental carbon in atmospheric aerosol. Background technique [0002] Organic carbon and elemental carbon, as important components of aerosols, endanger human health, reduce urban visibility, disrupt the earth's radiation balance and affect global climate, thus becoming key research directions in the field of aerosols. At present, the analysis methods of organic carbon and elemental carbon are mainly divided into two categories: thermal method and optical method. [0003] The basic principle of thermal analysis method is to distinguish organic carbon and elemental carbon according to their volatility and different escape rates at different temperatures. The volatilized, pyrolyzed and oxidized carbon is converted into CO2 through the action of a catalyst, and then CO2 was detected with an NDIR...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a device and method for automatically measuring the mass concentration of organic carbon / elemental carbon in atmospheric aerosol, to solve the problem that the thermal analysis method is inaccurate in the traditional technology, and the problem that the optical measurement method cannot measure organic carbon

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