Variables: total_organic_carbon Keywords: land use Substances: 5-Fluorouracil (GHASVSINZRGABV-UHFFFAOYSA-N) 1-3-Dimethyl-2-imidazolidinon (CYSGHNMQYZDMIA-UHFFFAOYSA-N) AMDOPH (IRTZMJWVZQYURE-UHFFFAOYSA-N)