On-line analysis device for volatile carbonyl compounds

Abstract

The invention relates to an on-line analysis device for volatile carbonyl compounds. The on-line analysis device comprises a power supply and program control box, a sampling and thermo-analysis device and a GC-MS, wherein the power supply and program control box is used for controlling and adjusting the working state of a whole system, and is connected to the sampling and thermo-analysis device through a circuit; a carrier gas cylinder is connected with the sampling and thermo analysis device; the sampling and thermo-analysis device can perform collection and thermo-analysis on volatile carbonyl compound samples synchronously; the samples after thermal-analysis pass through a fused quartz tube and enter into the GC-MS to perform separation and quantification on carbonyl compounds. Sampling stages and thermo-analysis stages of all sampling pipes do not interfere with one another, and can be performed synchronously, so that the continuous monitoring of the carbonyl compounds in ambient air is achieved. The on-line analysis device can not only be used for observing the carbonyl compounds in conventional ambient air, but also be used for continuously detecting a secondary organic aerosol oxidation product simulated by a smog chamber in a lab.

Description

technical field [0001] The invention relates to a detection device for volatile organic compounds, in particular to a detection device for carbonyl compounds in gas, which is applied in the technical field of air VOCs detection. Background technique [0002] Carbonyl compounds refer to a class of compounds containing carbonyl in their molecules, including aldehydes and ketones, which are commonly found in the atmosphere and are harmful to human health. Some carbonyl compounds such as formaldehyde and acrolein are suspected carcinogens. Carbonyl compounds are the most active class of volatile organic compounds (VOCs) during atmospheric photochemical reactions. Theoretically, almost all volatile organic compounds can be oxidized to carbonyl compounds. Carbonyl compounds are also precursors of free radicals (OH), ozone and peroxyacyl nitrates (PAN). Therefore, the distribution, source, migration and transformation of carbonyl compounds in the ambient atmosphere, the formation...

AI Technical Summary

Problems solved by technology

However, there are many defects in this method: such as difficult sampling, especially at night and under special weather conditions; easy to cause sample contamination during transportation and storage; sample processing and analysis need to consume a large amount of organic solvent; and offline analysis has obvious hysteresis , the time resolution is low (2-4 hours), for the rapidly changing atmospheric environment, it is difficult to meet the needs of real-time, automatic and continuous monitoring

However, these instruments are generally expensive and cumbersome to maintain, and they are mainly aimed at the online monitoring of conventional VOCs

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