Organizations: Environmental Analytical Chemistry Variables: concentration Substances: Chlorpyrifos (SBPBAQFWLVIOKP-UHFFFAOYSA-N) Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Cypermethrin (KAATUXNTWXVJKI-UHFFFAOYSA-N) Keywords: pyrethroids stream