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A method of removing individual gas components of a mixture of gases within a controlled environment container uses apparatus which comprises first and second chambers which are arranged in parallel for the gas mixture to flow through them from their inlet ends to their outlet ends. The chambers con

A method of removing individual gas components of a mixture of gases within a controlled environment container uses apparatus which comprises first and second chambers which are arranged in parallel for the gas mixture to flow through them from their inlet ends to their outlet ends. The chambers contain adsorbent material with different affinities for the gas components of the mixture. The method comprises supplying the gas mixture to the first chamber so as to pressurize it while allowing a purge stream to flow from the outlet end of the first chamber to the second chamber to purge adsorbed gas from the adsorbent material in the second chamber. A purge pulse of gas is then supplied from the outlet end of the first chamber to the second chamber to purge adsorbed gas from the adsorbent material in the second chamber, the rate of flow of the purge stream being less than that of the purge pulse.

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1. A method of removing individual gas components of a mixture of gases within a controlled environment container using apparatus which comprises first and second chambers which are arranged in parallel for the gas mixture to flow through them from their inlet ends to their outlet ends and which con

1. A method of removing individual gas components of a mixture of gases within a controlled environment container using apparatus which comprises first and second chambers which are arranged in parallel for the gas mixture to flow through them from their inlet ends to their outlet ends and which contain adsorbent material with different affinities for the gas components of the mixture, the method comprising:(a) supplying the gas mixture to the first chamber so as to pressurise it, while allowing a purge stream to flow from the outlet end of the first chamber to the second chamber to purge adsorbed gas from the adsorbent material in the second chamber, and (b) supplying a purge pulse of gas from the outlet end of the first chamber to the second chamber to purge adsorbed gas from the adsorbent material in the second chamber, the rate of flow of the purge stream being less than that of the purge pulse.