Variables: dissolved_organic_carbon Systems: groundwater Substances: 5-Fluorouracil (GHASVSINZRGABV-UHFFFAOYSA-N) 4-Hydroxy Diclofenac (KGVXVPRLBMWZLG-UHFFFAOYSA-N) 5-Fluoro Cytosine (XRECTZIEBJDKEO-UHFFFAOYSA-N)