Keywords: Chemcatcher monitoring Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) 1.3-benzothiazole-2-sulfonate (ZCXGMSGCBDSEOY-UHFFFAOYSA-N) 2.4-D (OVSKIKFHRZPJSS-UHFFFAOYSA-N) diuron (XMTQQYYKAHVGBJ-UHFFFAOYSA-N)