Variables: dissolved_organic_carbon total_organic_carbon concentration electric_conductivity pH Keywords: high resolution mass spectrometry land use Substances: 1-(3-Chlorophenyl)-piperazin (VHFVKMTVMIZMIK-UHFFFAOYSA-N) 2 -2 -Difluorodeoxyuridin (FIRDBEQIJQERSE-QPPQHZFASA-N)