Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) MCPA (WHKUVVPPKQRRBV-UHFFFAOYSA-N) mecoprop (WNTGYJSOUMFZEP-UHFFFAOYSA-N) Keywords: Chemcatcher monitoring