Variables: total_organic_carbon Keywords: land use Substances: 5-Fluorouracil (GHASVSINZRGABV-UHFFFAOYSA-N) 4-Methyl-Benzotriazole (CMGDVUCDZOBDNL-UHFFFAOYSA-N) 1-Propanesulfonate (KCXFHTAICRTXLI-UHFFFAOYSA-N)