Variables: dissolved_oygen total_organic_carbon electric_conductivity pH Substances: 1-Methyl-Benzotriazole (HXQHRUJXQJEGER-UHFFFAOYSA-N) 1-Propanesulfonate (KCXFHTAICRTXLI-UHFFFAOYSA-N) Systems: groundwater Keywords: monitoring MetFrag high resolution mass spectrometry