Keywords: monitoring polar organic pollutant Systems: flow channel experimental hall Substances: 2.4-D (OVSKIKFHRZPJSS-UHFFFAOYSA-N) clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) fipronil (ZOCSXAVNDGMNBV-UHFFFAOYSA-N) diuron (XMTQQYYKAHVGBJ-UHFFFAOYSA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) carbamazepine (FFGPTBGBLSHEPO-UHFFFAOYSA-N)