Extraction and trapping device for mercury isotope in solid sample

A technology of mercury isotopes and solids, which is applied in the direction of sampling devices and the preparation of test samples, etc., can solve the problems of poor accuracy, limited application range of detection samples, unstable detection of mercury isotopes, etc., and achieve convenient capture and easy The effect of the operation

Pending Publication Date: 2022-03-25
TSINGHUA UNIV
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Problems solved by technology

[0004] However, there are still some deficiencies in the current extraction and capture process of mercury isotopes in solid

Method used

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  • Extraction and trapping device for mercury isotope in solid sample
  • Extraction and trapping device for mercury isotope in solid sample
  • Extraction and trapping device for mercury isotope in solid sample

Examples

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Embodiment 1

[0048] This embodiment adopts figure 1 The mercury isotope extraction and trapping device for solid samples shown is used to extract and capture mercury isotopes from bituminous coal (NIST SRM 1632e) of the National Institute of Standards and Technology. Table 1 presents the recovery rate of mercury in the standard bituminous coal sample by this solid sample mercury isotope extraction and trapping device. It can be seen that the recovery rate of mercury is 88.9% to 106.9%, and the average recovery rate is 99.7±7.04%, which is close to 100% recovery rate. The mercury isotope detection results based on this device are shown in Table 2. It can be seen that the mercury isotope in the solid sample standard bituminous coal has a relatively significant negative mass fractionation MDF, δ 202 The range of Hg value is -2.74‰~-2.08‰, and its average value is -2.41‰±0.19‰, which is relatively close to that reported in the literature (-2.20‰±0.07‰). There is a low degree of non-mass-frac...

Embodiment 2

[0058] based on figure 1 The shown mercury isotope extraction and trapping device for solid samples, the actual environmental samples in this embodiment were processed and analyzed and compared with the reported data. The study analyzed the PM collected in the atmosphere of Beijing urban area from September 2017 to April 2018. 2.5 Aerosol samples were analyzed for mercury isotopes and compared with related studies such as figure 2 . It can be seen that the mercury isotope value in Beijing's atmospheric PM2.5 ranges from -0.19‰ to 0.94‰, which is relatively close to the reported Beijing atmospheric mercury isotope value (-0.52‰ to 0.73‰). And based on the atmospheric mercury isotopes tested in this study, it can be clearly seen that mercury in Beijing's atmosphere is affected by industrial projects such as coal combustion emissions, cement emissions, and non-ferrous metal smelting, which has practical guiding significance for the environmental health control of atmospheric m...

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Abstract

The invention provides a device for extracting and trapping mercury isotopes in a solid sample, the device comprises a mercury isotope extraction unit and a mercury isotope trapping unit, the mercury isotope extraction unit comprises a solid sample boat, a quartz outer tube, a first heat source and a second heat source, one end of the quartz outer tube is connected with an oxygen inlet tube, and the other end of the quartz outer tube is connected with a gas outlet tube; one end of the oxygen inlet pipe is connected to the quartz outer pipe, the other end of the oxygen inlet pipe is connected to the mercury isotope trapping unit, the solid sample boat is arranged at one end, close to the oxygen inlet pipe, in the quartz outer pipe, the first heat source and the second heat source are located at the bottom of the quartz outer pipe, and a heating area of the first heat source is a corresponding area of the solid sample boat. And a heating area of the second heat source is a blank area in the quartz outer tube. The device is widely applicable to solid samples containing different types of mercury with large mercury content difference, complex combustion pyrolysis components of the samples and many interference factors, can accurately, efficiently, stably and conveniently trap mercury isotopes in the samples, and has the characteristics of low cost, easiness in operation and the like.

Description

technical field [0001] The invention relates to the field of environmental science analysis and environmental monitoring devices, in particular to a device for extracting and trapping mercury isotopes in solid samples. Background technique [0002] Mercury is a global pollutant with neurological, renal, reproductive and genetic toxicity, and it can penetrate the blood-brain barrier and placental barrier. The human-made emissions of mercury in the global atmosphere are 2909t / a. Inorganic mercury in the atmosphere settles and migrates to the surface, which will pollute fish and rice and undergo methylation, posing a serious threat to ecosystems and human health. [0003] Mercury isotope tracer technology provides new means for exploring the transformation mechanism of different forms of mercury, accurate analysis and traceability of the source of mercury pollution, paleoclimate and paleoenvironmental evolution process, and inversion of mercury transport in regional and global ...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N1/44
CPCG01N1/22G01N1/44
Inventor 王书肖吴清茹韩德明李智坚汤翊温黾能
Owner TSINGHUA UNIV
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