Variables: electric_conductivity Substances: Adenosine (OIRDTQYFTABQOQ-UHFFFAOYSA-N) 1-Hydroxy-Benzotriazole (ASOKPJOREAFHNY-UHFFFAOYSA-N) 1-Naphthylacetic acid (PRPINYUDVPFIRX-UHFFFAOYSA-N) Keywords: high resolution mass spectrometry monitoring land use