Elemental analysis-mass spectrometry combined system and method for testing trace sulfur isotopes

Abstract

The invention discloses an elemental analysis-mass spectrometry combined system and a method for testing trace sulfur isotopes. The elemental analysis-mass spectrometry combined system comprises an elemental analyzer, a chromatographic column and a stable isotope ratio mass spectrometer, the element analyzer comprises an automatic sample introduction disc, an oxidation furnace, a reduction furnace and a water removal trap which are connected in sequence; an oxidation reduction pipe in the oxidation furnace adopts a reducing structure, and the inner diameter of an upper pipe is larger than that of a middle pipe and is larger than that of a lower pipe; the inner diameter of an oxygen balance pipe in the reduction furnace does not exceed 4mm; and the inner diameter of the water removal trap does not exceed 4mm, the water removal trap is arranged between the oxygen balance pipe and the chromatographic column, and the output end of the chromatographic column is connected with the stable isotope ratio mass spectrometer. According to the invention, the inner diameters of the oxidation tube, the reduction tube, the water removal tube and the chromatographic column are optimized, the flow velocity of the carrier gas is reduced, and the dilution ratio of the carrier gas to the target gas is reduced under the condition that the peak shape coefficient is basically unchanged, so that the purpose of testing the trace sulfur isotope is realized, and the corrosion strength of sulfur dioxide to the whole system pipeline is reduced.

Description

technical field [0001] The invention relates to the field of stable isotope analysis and testing, in particular to an elemental analysis-mass spectrometry system and a method for testing trace sulfur isotopes Background technique [0002] Sulfur element is widely distributed in air, water, rock, soil, coal, petroleum and other media in nature, and its occurrence forms are various, including organic sulfur, inorganic sulfur, hydrogen sulfide, elemental sulfur, sulfide and sulfate. The relative mass difference between different sulfur isotopes is large, their fractionation effect is more obvious in nature, and the sulfur isotope changes in a large range in geological processes, so sulfur and its isotopic composition are used in many fields of earth science. It is considered to be an extremely important geochemical tracer element, mainly used in scientific fields such as paleoenvironment, biology, environmental science and mineralogy. [0003] The elemental analysis-stable iso...

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Problems solved by technology

In the process of practical application, the sulfur content in precious samples or whole rock samples is relatively small. When the quality of sulfur element meets the test requirements, the sample package volume needs to be at least 50 mg. Excessive package sample volume cannot be completely absorbed during the dynamic flash combustion process. Combustion, accurate analysis cannot be achieved, therefore, there is an urgent need for an online method for testing the composition of sulfur isotopes in samples with low sulfur content

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