Substances: Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Cyphenothrin (FJDPATXIBIBRIM-UHFFFAOYSA-N) Deltamethrin (OWZREIFADZCYQD-NSHGMRRFSA-N) Cypermethrin (KAATUXNTWXVJKI-UHFFFAOYSA-N) Keywords: pyrethroids trace analytics stream Insecticides