Variables: concentration Keywords: monitoring polar organic pollutant pesticide Substances: carbendazim (TWFZGCMQGLPBSX-UHFFFAOYSA-N) 2.4-D (OVSKIKFHRZPJSS-UHFFFAOYSA-N) carbamazepine (FFGPTBGBLSHEPO-UHFFFAOYSA-N) terbutryn (IROINLKCQGIITA-UHFFFAOYSA-N)