Sample preparation device and sample preparation method for sulfur isotope analysis

Abstract

The invention relates to a sample preparation device and a sample preparation method for sulfur isotope analysis, and especially relates to an experiment device and method for conversion of sulfur in sulfur-containing mineral into sulfur dioxide gas. The device and method are mainly used for pre-treatment of sulfur isotope gas mass spectrometry. The device is characterized in that the original quartz reactor is divided into multiple parts, a stainless steel reactor joint is used, a quartz reaction tube is installed at the bottom, a quartz sample introduction tube is installed at the side, an O-shaped ring is used for sealing a quartz device and a metal device so that quartz reaction tube replacement is convenient and vacuum grease use is reduced, the original glass tube is replaced by a stainless steel tube, and the stainless steel tube is not broken easier than the glass tube and can be repaired easily without special technicists. The device and method can effectively reduce vacuum grease use and greatly reduce the influence produced by vacuum grease on an experiment test in the experiment.

Description

technical field [0001] The invention relates to a sample preparation device and method for sulfur isotope analysis, in particular to an experimental device and method for converting sulfur in sulfur-containing minerals into gaseous sulfur dioxide, and is mainly used in the pretreatment process of sulfur isotope gas mass spectrometry analysis. Background technique [0002] The current conventional method for determining the sulfur isotope composition in sulfide and sulfate requires first converting the sulfur in a solid or liquid sample into sulfur dioxide gas, and then measuring the sulfur isotope ratio in the sample by a gas mass spectrometer. Cuprous oxide (or vanadium pentoxide) and sulfide (or silicate) are more commonly used to oxidize (or reduce) the sulfur in the sulfide into sulfur dioxide. [0003] The pretreatment experimental device required by this method is mainly composed of mechanical pump, diffusion pump, vacuum gauge, cold trap, heating electric furnace, qua...

AI Technical Summary

Problems solved by technology

Vacuum grease is easy to pollute and absorb sulfur dioxide gas, which causes deviations in analysis and testing

[0006] Secondly, due to the sputtering of the sample during high-temperature reaction, the combustion tube wall is polluted and it is difficult to clean, and the pollutants are embedded in the quartz reactor, and its expansion coefficient is quite different from that of the quartz reactor, which is likely to cause cracks in the quartz tube wall , the quartz reactor needs to be replaced periodically

In addition, the quartz reactor with branch pipes is inconvenient to clean, easy to bump, and inconvenient to operate

[0007] In addition, glass pipes are easily damaged by stress and require maintenance and repair

[0008] The cutting and welding of quartz glass and the installation and repair of glass pipes require specialized technicians. In addition, quartz glass consumables are expensive, which not only requires high analysis costs, but also is inconvenient to operate.

[0009] Finally, once the glass pipe is damaged by stress, the mechanical pump will be directly exposed to the air, which will pose a safety hazard during the experiment.

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