Variables: dissolved_organic_carbon Substances: AMDOPH (IRTZMJWVZQYURE-UHFFFAOYSA-N) 5-Fluoro Cytosine (XRECTZIEBJDKEO-UHFFFAOYSA-N) 3-5-dibromo-4-hydroxybenzoic acid (PHWAJJWKNLWZGJ-UHFFFAOYSA-N) Keywords: high resolution mass spectrometry