Degradation of selected pesticides in aquatic ecosystem model

The objective of this study was to evaluate the distribution of beta-cyflutrin, lambda-cyhalotrin, esfenvalerate and permethrin in an aquatic ecosystem model. The investigations were carried out in three parallel series at a temperature 22 +/- 2degreesC. Concentrations of pyrethroids were close to those which were found in surface waters after spraying. It was shown, that half life of investigated pyrethroids changed within the range 2.87 to 13.86 d. It was proved that degradation rate of pyrethroids was dependent on the preparation concentration and form they were introduced to water.