Keywords: trace analytics toxicity stream pyrethroids Insecticides Systems: stream Substances: Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Deltamethrin (OWZREIFADZCYQD-NSHGMRRFSA-N) Cypermethrin (KAATUXNTWXVJKI-UHFFFAOYSA-N)