Method and device for combined collection of trace level mercury species in atmosphere
A form of mercury and sampling device technology, applied in the direction of sampling devices, etc., can solve problems such as immature methods, comprehensive establishment of mercury pollution monitoring network, and cumbersome analysis process, so as to reduce a large number of equipment, avoid frequent replacement of sampling media, and improve experimental results. efficiency effect
Active Publication Date: 2013-02-13
中科嘉辞(昆山)环保科技有限公司
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Problems solved by technology
[0011] Although my country is a major emitter of mercury, and the concentration of mercury in the atmosphere is also on the rise, there is no systematic and comprehensive establishment of an inventory of mercury emissions in the atmosphere and a monitoring network for mercury pollution. less research
The reason is closely related to the difficulty of sampling and collecting mercury in the atmosphere, the cumbersome analysis process, and the immature method.
Method used
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Effect test
Embodiment 1
[0022] Use the sampling device under fine weather conditions, the sampling flow rate is 2-30L / h, the constant temperature heating temperature of the diffusion tube is 30-80°C, and the total sampling time is 0.2-2h. The concentration of RGM, pHg and GEM after analysis of the sample is 21.2pg / m 3 , 107.5pg / m 3 , 4.5ng / m 3 , the mercury desorption rate of adsorption medium material KCl coating, quartz fiber filter membrane, and gold-plated quartz sand reaches 99.7%, 99.6%, and 99.9%, respectively.
Embodiment 2
[0024] The sampling device is used under cloudy weather conditions, the sampling flow rate is 2-30L / h, the constant temperature heating temperature of the diffusion tube is 30-80°C, and the total sampling time is 0.2-2h. The concentration of RGM, pHg and GEM after analysis of the sample is 35.7pg / m 3 、215.5pg / m 3 , 5.2ng / m 3 , the mercury desorption rate of the adsorption medium material KCl coating, quartz fiber filter membrane, and gold-plated quartz sand reaches 99.6%, 99.4%, and 99.8%, respectively.
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The invention provides a method and a device for combined collection of trace level mercury species in atmosphere, belonging to the technical field of atmosphere environment monitoring. The method can control the sampling process by a program controller; the sampling airflow can sequentially pass by a diffusion pipe filled with a KCl coating, a filtration membrane pipe filled with quartz fibers, and a mercury capturing pipe filled with gold-plated quartz sands; and the trace level gas state divalent mercury (RGM), grain-state mercury (pHg) and gas-state elementary mercury (GEM) are respectively adsorbed or intercepted by the KCl saturated solution, the quartz fiber filtration membrane and the gold-plated quartz sands, thus realizing the combined sampling on three different mercury species. In the invention, the device has a simple system, the parameter can be adjusted accurately; the running is reliable, the test efficiency is high; synchronous series sampling is carried out on the trace level mercury in three different species in the atmosphere, a large amount of apparatuses required for field operation are reduced; the test efficiency is improved, and the function of twofold efficiency with half effort is achieved.
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). Table 1 shows the classification and proportion of various forms of mercury in total atmospheric mercury. [0003] Table 1 Speciation classification and ...
Claims
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IPC IPC(8): G01N1/24
Inventor 陈进生徐玲玲赵金平张福旺尹丽倩徐亚
Owner 中科嘉辞(昆山)环保科技有限公司