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Sampling device and sampling method for massively collecting atmospheric gaseous mercury in short term

A sampling device, gaseous mercury technology, applied in the direction of measuring devices, sampling devices, sampling, etc., to achieve the effect of increasing the flow rate of atmospheric samples, sampling is simple and easy, and the accuracy is high

Inactive Publication Date: 2019-03-22
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional gold-coated quartz sand enrichment method uses only one gold-coated quartz sand tube to collect atmospheric gaseous mercury. In order to ensure the sampling efficiency, the sampling gas flow rate is usually limited to less than 2L / min, so it is difficult to collect atmospheric gaseous mercury in a short time in the atmosphere with a low mercury background. Collect sufficient quantities of mercury for high-resolution, high-accuracy mercury isotope testing

Method used

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  • Sampling device and sampling method for massively collecting atmospheric gaseous mercury in short term
  • Sampling device and sampling method for massively collecting atmospheric gaseous mercury in short term
  • Sampling device and sampling method for massively collecting atmospheric gaseous mercury in short term

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Embodiment 1

[0037] Connect the filter membrane box, atmospheric mercury sampling unit, instantaneous flowmeter, vacuum pump, and positive displacement flowmeter through thick-walled silicone hoses to ensure the airtightness of the device as a whole; the diameter of the filter membrane box is 62mm, including polycarbonate Filter housing and polystyrene maple support pad; the quartz fiber filter membrane carried by the filter membrane box has a diameter of 47mm, and the interception efficiency of atmospheric particulate matter reaches 99.9%. The hollow tube is a 3.5 cm long quartz thin tube. The first tapered funnel, the second tapered funnel, the airtight plate and the hollow tube at the wide mouth end of the first tapered funnel and the second tapered funnel are made of quartz glass; the length of the sampling tube is 12cm, and the inner diameter is 5mm, outer diameter 7mm, filled with 1.5g gold-plated quartz sand inside, with quartz wool plugged at both ends of the filling. The instanta...

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Abstract

The invention discloses a sampling device and sampling method for massively collecting atmospheric gaseous mercury in a short term. The sampling device comprises a filter membrane box for filtering away atmospheric particulate matter, an atmospheric gaseous mercury sampling unit connected with an outlet of the filter membrane box, an instantaneous flow meter connected with the outlet end of the atmospheric gaseous mercury sampling unit, a vacuum pump connected with the outlet end of the flow meter, and a volumetric flow meter connected with an outlet of the vacuum pump, wherein the atmosphericgaseous mercury sampling unit is composed of six gold-plated quartz sand tubes and two modified conical funnels. The sampling device is capable of collecting a sufficient amount of atmospheric gaseous mercury for isotope analysis within a few hours; and equipment in the sampling device is easy to assemble and disassemble and easy to operate; sampling is simple and easy; and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of sampling atmospheric components, in particular to a sampling device and a sampling method for collecting a large amount of atmospheric mercury in a relatively short period of time. Background technique [0002] Mercury is a biologically toxic heavy metal element that can accumulate and transfer in the body in the form of highly toxic methylmercury, thereby endangering human health. At the same time, mercury is also the only element that exists stably in the atmosphere as a single metal, which can be recycled and deposited on a global scale. Anthropogenic mercury emissions have been increasing in recent years, reaching 2000t / a, resulting in the background value of atmospheric mercury being more than three times higher than that before the industrial revolution. [0003] According to the different physical and chemical states of mercury in the atmosphere, atmospheric mercury is artificially divided into at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24
CPCG01N1/2205G01N1/24
Inventor 孙若愚单冰
Owner TIANJIN UNIV
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