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