Variables: concentration Keywords: trace analytics toxicity stream pesticides pyrethroids Insecticides Systems: stream Substances: Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Empenthrin (YUGWDVYLFSETPE-JLHYYAGUSA-N)