Variables: pH electric_conductivity total_organic_carbon concentration Keywords: high resolution mass spectrometry pesticides metabolites Systems: groundwater Substances: 1-Methyl-Benzotriazole (HXQHRUJXQJEGER-UHFFFAOYSA-N) 1-(3-Chlorophenyl)-piperazin (VHFVKMTVMIZMIK-UHFFFAOYSA-N)