Variables: concentration Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) mecoprop (WNTGYJSOUMFZEP-UHFFFAOYSA-N) diazinon (FHIVAFMUCKRCQO-UHFFFAOYSA-N) Keywords: pharmaceutical sewer overflows monitoring pesticide