Keywords: Chemcatcher monitoring polar organic pollutant Substances: carbamazepine (FFGPTBGBLSHEPO-UHFFFAOYSA-N) 1.3-benzothiazole-2-sulfonate (ZCXGMSGCBDSEOY-UHFFFAOYSA-N) mecoprop (WNTGYJSOUMFZEP-UHFFFAOYSA-N) metolachlor (WVQBLGZPHOPPFO-UHFFFAOYSA-N)