Variables: dissolved_oygen electric_conductivity total_organic_carbon Keywords: high resolution mass spectrometry pesticides metabolites land use Substances: 18-beta-Glycyrrhetinic acid (MPDGHEJMBKOTSU-YKLVYJNSSA-N) 1-(3-Trifluoromethylphenyl)-piperazine (KKIMDKMETPPURN-UHFFFAOYSA-N)