Mercury reduction reaction gas-liquid separation device for high-precision mercury isotope determination and use method

Abstract

The invention relates to a mercury reduction reaction gas-liquid separation device for high-precision mercury isotope determination, the device comprises an outer sleeve and a reaction tube, the upper end of the outer sleeve is provided with a reactant outlet, a proofreading sample inlet and a feed inlet which are communicated with the inner cavity of the outer sleeve, and the lower end of the outer sleeve is provided with a gas inlet; a frosted surface is arranged on the outer surface of the reaction tube, and a connecting part is arranged at the lower end of the reaction tube and used for being in sealed connection with the lower end opening of the outer sleeve. According to the invention, as the vertical height of the frosted surface is large, mercury and stannous chloride can fully react, and gaseous zero-valent mercury can be fully generated and output along with gas flow, so that the deviation between the gaseous zero-valent mercury and the proofreading sample is reduced, and the accuracy of subsequent isotope detection is ensured. In addition, the outer sleeve and the reaction tube are very easy to separate, the outer sleeve and the reaction tube are separated and respectively cleaned after the reaction is completed, the frosted surface of the reaction tube is easy to clean, and the next reaction is not influenced.

Description

technical field [0001] The invention belongs to the technical field of isotope measurement equipment improvement, in particular to a mercury reduction reaction gas-liquid separation device and a use method for high-precision mercury isotope measurement. Background technique [0002] Mercury is the only heavy metal element that can exist in the environment in gaseous elemental form, and has the characteristics of persistence, long-distance transport, high toxicity and bioaccumulation. Due to the various characteristics of mercury, it is widely used in various scientific research fields. In the modern environment, the biogeochemical cycle of mercury is used to indicate the impact of human activities, analyze the source and process of environmental pollution, and explore the source and enrichment mechanism of mercury in ecosystems such as oceans, forests, and polar regions. [0003] Mercury isotopes are tracers of the biogeochemical cycle of mercury. Different fractionation ch...

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Problems solved by technology

[0006] The above-mentioned mercury atom cold steam generator has the following problems: 1. Because the vertical height of the reaction rod is small, the reduction reaction interface of mercury and tin protochloride is small, resulting in insufficient reduction reaction, so that the gaseous zero-valent mercury produced by reduction Both the amount and the isotope ratio deviate from the actual sample, which affects the accuracy and precision of the isotope detection of the subsequent equipment; 2. The reaction rod and the tee head are fixed with the U-shaped tube and cannot be disassembled, which makes cleaning difficult and affects the next time when it is used again. The blank value of the test process; 3. The equipment purchase cost is high, which increases the experimental cost

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