Method and apparatus for analysis of ionsized gases

An apparatus, comprising:

• an inlet region for receiving a gas mixture;
• an ionizer for supplying hydronium ions to the gas mixture to generate ions, wherein the ionizer comprises a membrane for receiving the gas mixture, and wherein the membrane is capable of generating hydronium ions from water;
• and
• an ion detector for detecting ions generated from the gas mixture.

A method, comprising:

• contacting water molecules with a membrane capable of generating hydronium ions from water;
• contacting a gas mixture with the hydronium ions for generating ions of molecules comprised in the gas mixture;
• and
• detecting ions generated.

A breath analyser, comprising:

• an inlet region configured to receive a gas mixture;
• an ionizer comprises a membrane configured to generate hydronium ions, the ionizer is configured to use at least the hydronium ions to generate ions from the gas mixture;
• a drift region configured to separate ions according to their ion mobility;
• and
• an ion detector configured to detect ions generated from the gas mixture.