Variables: dissolved_oygen electric_conductivity Substances: 2 -2 -Difluorodeoxyuridin (FIRDBEQIJQERSE-QPPQHZFASA-N) 4-Hydroxy-Benzotriazole (NPZTUJOABDZTLV-UHFFFAOYSA-N) Systems: groundwater Keywords: high resolution mass spectrometry land use