Variables: dissolved_organic_carbon total_organic_carbon electric_conductivity Keywords: high resolution mass spectrometry Substances: Acesulfame (YGCFIWIQZPHFLU-UHFFFAOYSA-N) 18-beta-Glycyrrhetinic acid (MPDGHEJMBKOTSU-YKLVYJNSSA-N) 1-(3-Trifluoromethylphenyl)-piperazine (KKIMDKMETPPURN-UHFFFAOYSA-N)