(EN) Provided is a method for treating a volatile liquid using a pipette, the method comprising: a low volatile liquid suctioning step of suctioning a low volatile liquid, having a lower volatility than the volatile liquid, from a suctioning and discharge port; an air suctioning step of suctioning air from the suctioning and discharge port, after the low volatile liquid suctioning step; and a volatile liquid suctioning step of suctioning the volatile liquid from the suctioning and discharge port, after the air suctioning step.