Keywords: toxicity pyrethroids Insecticides Systems: stream Substances: Chlorpyrifos (SBPBAQFWLVIOKP-UHFFFAOYSA-N) Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Cyfluthrin (OFHFONYRMVKULH-WNYJFNBPSA-N) Empenthrin (YUGWDVYLFSETPE-JLHYYAGUSA-N)