Variables: concentration Substances: benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) terbutryn (IROINLKCQGIITA-UHFFFAOYSA-N) mecoprop (WNTGYJSOUMFZEP-UHFFFAOYSA-N) diclofenac (DCOPUUMXTXDBNB-UHFFFAOYSA-N) Systems: flow channel experimental hall Keywords: Chemcatcher pharmaceutical sewer overflows monitoring pesticide