Variables: concentration Keywords: toxicity stream pyrethroids Insecticides Systems: stream Substances: Imiprothrin (VPRAQYXPZIFIOH-PYMCNQPYSA-N) Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Empenthrin (YUGWDVYLFSETPE-JLHYYAGUSA-N)