Variables: electric_conductivity Keywords: MetFrag micropollutants high resolution mass spectrometry land use Substances: 5-Chloro-2-methyl-4-isothiazolin-3-on (CMI) (DHNRXBZYEKSXIM-UHFFFAOYSA-N) 1-Naphthylacetic acid (PRPINYUDVPFIRX-UHFFFAOYSA-N)