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The CLOUD project investigates the influence of galactic cosmic rays on the nucleationof new particles in an environmental chamber at CERN. Dimethylamine (DMA) was injectedintentionally into the CLOUD chamber to reach atmospherically relevant levels away fromsources (up to 100 pptv) in order to study its effect on nucleation with sulphuric acidand water at 278 K.Quantification of DMA and also background ammonia (NH3) was performed with ionchromatography (IC). The IC method used together with the sampling line developed for CLOUDin order to measure NH3 and DMA at low pptv levels is described; the overallsampling efficiency of the method is discussed; and, finally, mixing ratios of NH3 and DMA measured during CLOUD4 are reported

Dimethylamine and ammonia measurements with ion chromatography during the CLOUD4 campaign