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Method and device for analyzing trace gaseous elemental mercury

An analysis method, a technology of elemental mercury, applied in sampling devices, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of low blank space, time-consuming analysis, poor reproducibility, etc., achieve simple analysis process, reduce detection limit, realize The effect of automation

Inactive Publication Date: 2011-10-19
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method eliminates the reagent blank problem in chemical analysis, and has the advantages of low blank and reusable gold mercury trapping tubes, but it still has time-consuming analysis, poor reproducibility, and the analysis results are affected by the acid gas in the air during the sampling process. Impact and other issues

Method used

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  • Method and device for analyzing trace gaseous elemental mercury
  • Method and device for analyzing trace gaseous elemental mercury

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Effect test

Embodiment 1

[0017] Atmospheric GEM samples were collected under fine weather conditions and placed in the analysis device. Set the carrier gas (high-purity Ar) flow rate to 20-100mL / min, and the sample pyrolysis releaser heats the sample mercury trapping tube at 300-700°C for 10-60s, and the Hg in the tube 0 The steam is purified and enriched for the second time, and the second enrichment / pyrolysis emitter is heated at 300-700°C for 0-60s, and the Hg released by the second pyrolysis 0 The vapor enters the fluorescence detector for analysis, and the obtained atmospheric GEM concentration is 3.6ng / m 3 , and the relative deviation from the average concentration monitored by the continuous on-line mercury meter in the same period was 3.5%.

Embodiment 2

[0019] Atmospheric GEM samples were collected under haze weather conditions and placed in the analysis device. Set the carrier gas (high-purity Ar) flow rate to 20-100mL / min, and the sample pyrolysis releaser heats the sample mercury trapping tube at 300-700°C for 10-60s, and the Hg in the tube 0 The steam is purified and enriched for the second time, and the second enrichment / pyrolysis emitter is heated at 300-700°C for 0-60s, and the Hg released by the second pyrolysis 0 The vapor enters the fluorescence detector for analysis, and the obtained atmospheric GEM concentration is 5.3ng / m 3 , and the relative deviation from the average concentration monitored by the continuous on-line mercury meter in the same period was 2.9%.

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Abstract

The invention discloses a method and a device for analyzing trace gaseous elemental mercury, and belongs to the technical field of atmospheric environment monitoring. In the method, the whole analysis process is controlled by a programmable logic controller. The method comprises the following steps of: arranging a mercury trapping tube collecting atmospheric gaseous elemental mercury (GEM) samples into a pyrolysis releaser for rapid heating, removing acid components carried by released HgO vapor from the released HgO vapor, introducing the HgO vapor into a secondary enrichment / pyrolysis releaser, and secondarily absorbing the HgO vapor by using the mercury trapping tube in the secondary enrichment / pyrolysis releaser; and rapidly heating the secondary enrichment / pyrolysis releaser, and blowing the secondarily pyrolyzed desorbed HgO vapor into a cold atomic fluorescence detector for quantitative detection by using a carrier gas. The device provided by the invention has a simple system, and is reliable in running; the atmospheric GEM samples collected by the mercury trapping tube are analyzed after being secondarily enriched, pyrolyzed and released so as to effectively reduce the limit of detection of the device and meet the requirements of trace analysis on the atmospheric GEM.

Description

technical field [0001] The invention belongs to the technical field of atmospheric environment monitoring, and relates to a combined sampling method and device for trace forms of mercury in the atmosphere. Background technique [0002] Mercury (Hg) is a highly toxic, non-essential heavy metal element in organisms, and it is also the only heavy metal pollutant that mainly exists in the atmosphere in gaseous form. The atmospheric environment is an important place for the migration and transformation of mercury. Mercury in the atmospheric environment is mainly divided into the following physical and chemical forms: gaseous elemental mercury (Hg 0 , Gaseous ElementalMercury, GEM), active gaseous mercury (Hg 2+ , Reactive Gaseous Mercury, RGM) and particulate mercury (pHg, Particle Mercury, adsorbed in atmospheric particles). Among them, GEM accounts for about 90% of the total atmospheric mercury, and the background value of global GEM concentration is about 1.5-2.0ng / m 3 . D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N1/22
Inventor 陈进生徐亚赵金平徐玲玲张福旺尹丽倩
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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