In a method for ionization of a fluid, wherein a first pair of electrodes are arranged in a container opposite each other and at a distance from each other, the method includes conveying the fluid in a gaseous state inside the container in a fluid flow past the first pair of electrodes, charging the electrodes in the first pair of electrodes so that electric discharges takes place, and supplying the fluid flow in a pulsed manner to an inlet of the container.