Device and method for quantitatively analyzing total mercury of atmosphere/smoke based on low-temperature plasma

Abstract

The invention relates to a device for quantitatively analyzing total mercury of atmosphere / smoke based on a low-temperature plasma. The device comprises a thermocatalytic reactor (1), a gold amalgam enrichment device (2), a low-temperature plasma excitation source (3) and a spectrometer (5), which keeps in communication through a quartz tube, wherein the spectrometer (5) connected with the low-temperature plasma excitation source (3) through an optical fiber probe. The thermocatalytic reactor is contacted with air / smoke completely to convert Hg<2+> into Hg<0>. A certain amount of surface gold-plating quartz sand is filled in a gold amalgam enrichment pipe and can completely adsorb the Hg<0> in the gas at a normal temperature. High-purity Ar filled into the excitation source is excited by high-frequency high-voltage electricity applied to a ceramic pipe by a neon lamp power supply to form the low-temperature plasma with a large amount of high-density high-energy electrons. The plasma further excites the Hg<0> vapor, so that the 253.7-nm characteristic excitation spectral line is transmitted. The spectrometer records the intensity of the characteristic spectral line and establishes a linear model based on the intensity of the spectral line and the Hg<0> concentration so as to calculate to obtain the Hg<0> content of the atmosphere / smoke.

Description

technical field [0001] The invention belongs to the field of low temperature plasma (Low temperature plasma, LTP) quantitative detection of trace mercury concentration in the atmosphere / flue gas, specifically a gold amalgam online enrichment-external heating evaporation-low temperature plasma excitation method , Realize the quantitative analysis technology and instrument of trace mercury in the atmosphere / flue gas. Background technique [0002] The excitation source uses dielectric barrier discharge technology to excite Ar gas to generate low-temperature plasma. This type of excitation source has the advantages of low energy consumption (less than 10W), small size, low working temperature (room temperature), simple structure, and easy processing. Ideal excitation source for excitation and detection of medium and trace heavy metal pollutants. While the existing commercialized Hg in the atmosphere / flue gas 0 Measuring instruments are mostly expensive imported instruments, ba...

AI Technical Summary

Problems solved by technology

This type of instrument has a complex structure and high cost, and it is easy to form mercury residues in the detector, and it is also inevitably affected by other gas pollutants in the flue gas (such as SO 2 、H 2 S. NO x etc.) spectral interference

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