Variables: electric_conductivity Systems: groundwater Substances: 2-Aminobenzimidazole (JWYUFVNJZUSCSM-UHFFFAOYSA-N) 1-3-Dimethyl-2-imidazolidinon (CYSGHNMQYZDMIA-UHFFFAOYSA-N) 1-[(4-Chlorophenyl)phenylmethyl]piperazine (UZKBSZSTDQSMDR UHFFFAOYSA-N)