Variables: dissolved_organic_carbon electric_conductivity concentration Keywords: high resolution mass spectrometry pesticides metabolites land use Systems: groundwater Substances: 1-Naphthylacetic acid (PRPINYUDVPFIRX-UHFFFAOYSA-N) 2 -2 -Difluorodeoxyuridin (FIRDBEQIJQERSE-QPPQHZFASA-N)