Purification system for nitrogen gas and xenon gas in water and isotope static analysis method thereof

A purification system for nitrogen gas and xenon gas in water, the purification system comprising a sample container, a carbon dioxide ice cold trap, a gas delivery main pipe and a mass spectrometer for noble gas that are communicated with the sample container sequentially, wherein the gas delivery main pipe is provided with branch pipelines that are communicated with a cryo pump and a vacuum pump set respectively, the mass spectrometer for noble gas is communicated with the vacuum pump set, and the cryo pump is configured to be set at different temperatures to adsorb or release the nitrogen gas and/or the xenon gas;

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• an inlet side and an outlet side of the carbon dioxide ice cold trap are respectively provided with a first valve and a second valve, a fourth valve is disposed between the gas delivery main pipe and the vacuum pump set, a fifth valve is disposed between the gas delivery main pipe and the cryo pump, a seventh valve is disposed between the gas delivery main pipe and the mass spectrometer for noble gas, and a ninth valve is disposed between the mass spectrometer for noble gas and the vacuum pump set, wherein a gas delivery branch pipe is disposed between the gas delivery main pipe and the mass spectrometer for noble gas, the gas delivery branch pipe comprises a nitrogen gas delivery branch pipe and a xenon gas delivery branch pipe that are disposed in parallel, the seventh valve is disposed on the nitrogen gas delivery branch pipe, and a sixth valve is disposed on the xenon gas delivery branch pipe.