Device for integrally collecting and determining mercury in different forms at atmosphere and sampling method of device

Abstract

The invention provides a device for integrally collecting and determining mercury in different forms at atmosphere and a sampling method of the device. A device main body is internally provided with aparticulate mercury collecting tube, an active gaseous mercury collecting tube, an amalgamation tube and an elemental mercury collecting tube in sequence from top to bottom; a heating device is arranged on each of the outer sides of the device main body, which correspond to the particulate mercury collecting tube, the active gaseous mercury collecting tube, the amalgamation tube and the elementalmercury collecting tube; a cooling tube is arranged between the particulate mercury collecting tube and the active gaseous mercury collecting tube, between the active gaseous mercury collecting tubeand the amalgamation tube and between the amalgamation tube and the elemental mercury collecting tube respectively. When the mercury in the different forms at atmosphere is collected, particulate mercury in atmosphere is collected by a filter membrane, active gaseous mercury and elemental mercury can pass through the filter membrane, then, the active gaseous mercury is collected by quartz granulesplated with potassium chloride, and the elemental mercury is collected by quartz beads plated with gold, so that the mercury in the different forms at atmosphere can be collected.

Description

technical field [0001] The invention relates to the technical field of environmental pollutant monitoring in the atmosphere, and more specifically relates to a device for integrated collection and analysis of particulate mercury, active gaseous mercury and elemental mercury in a natural atmospheric environment. Background technique [0002] Atmospheric mercury is a global heavy metal pollutant, and it is one of the priority pollutants controlled by agencies such as the United Nations Environment Programme, the World Health Organization, the Ministry of Environmental Protection of my country and the US Environmental Protection Agency. Mercury has special physical and chemical properties. As the main channel for long-distance transport of mercury, the atmosphere plays an important role in the global biochemical cycle of mercury. There are three main forms of mercury in the atmosphere: gaseous elemental mercury (GEM, zero-valent state, accounting for more than 90% of the total ...

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the deficiencies of the existing active gaseous mercury capture method, the existing active gaseous mercury capture mainly adopts potassium chloride as the adsorption medium, such as potassium chloride diffusion tube (in the inner wall of the outer tube of the quartz tube and the outer wall of the inner tube) Potassium chloride-coated) and potassium chloride-coated glass fiber membranes, but the capture efficiency of potassium chloride diffusion tubes for active gaseous mercury is not yet clear, and potassium chloride-coated glass fiber membranes are difficult to reuse

[0005] The present invention overcomes the shortcomings of the existing atmospheric mercury capture and analysis methods. The existing monitoring methods mostly use the Tekran monitoring system, which is bulky and complicated to install, which is not conducive to carrying around, and the price is relatively expensive; membrane filtration, chlorination The separate collection of particulate mercury and active gaseous mercury by the potassium diffusion tube method requires analysis and determination after thermal reduction-allimation-gold tube enrichment, and the analysis process is complicated, which is not conducive to rapid determination

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