Patent ID: 8056395

Claim:
A method for detecting a chemical substance contained in a gas sample using an analyzing device, comprising the following steps (a) to (h): a step (a) of preparing the analyzing device, wherein, the analyzing device comprises: a vessel, an inlet for injecting the gas sample, and provided with the vessel, an atomizing electrode inside the vessel, a cooling part cooling the atomizing electrode, a counter electrode provided in the vessel, an intermediate electrode disposed between the atomizing electrode and the counter electrode, and a liquid detector, a step (b) of injecting the gas sample from the inlet to the vessel, wherein the gas sample contains vapor, a step (c) of cooling the atomizing electrode with the cooling part to condense the gas sample into a first condensate liquid on the surface of the atomizing electrode, a step (d) of applying a potential difference between the atomizing electrode and the intermediate electrode to cause the first condensate liquid to be electric-charged fine particles, a step (e) of recovering the electric-charged fine particles on the surface of the counter electrode by applying a potential difference between the intermediate electrode and the counter electrode to obtain a second condensate liquid, a step (f) of detecting with the liquid detector that the second condensate liquid has not less than predetermined amount, a step (g) of inserting a support comprising a detecting electrode into the vessel to bring the detecting electrode into contact with the second condensate liquid, and a step (h) of applying current voltage between the counter electrode and the detecting electrode to detect the chemical substance on the basis of the value of the generated current.