Variables: concentration Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) diuron (XMTQQYYKAHVGBJ-UHFFFAOYSA-N) fipronil (ZOCSXAVNDGMNBV-UHFFFAOYSA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) Keywords: Chemcatcher sewer overflows monitoring polar organic pollutant