Keywords: monitoring polar organic pollutant Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) carbendazim (TWFZGCMQGLPBSX-UHFFFAOYSA-N) diuron (XMTQQYYKAHVGBJ-UHFFFAOYSA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) diazinon (FHIVAFMUCKRCQO-UHFFFAOYSA-N)