Dynamika vnosu pesticidů do vodárenských nádrží Vír I, Opatovice a Ludkovice

Pesticides are still an important group of substances involved in surface water pollution. Their increased occurrence in the watercourses in the agricultural landscape is mainly linked to rainfall-runoff conditions, types of cultivated crops and methods of agricultural management. In order to capture these factors, passive sampling techniques were chosen for the assessment of the burden of these substances in the selected catchments of water supply reservoirs in the administration of the Povodí Moravy state enterprise. These techniques consist of continuous exposure of several weeks with gradual (integrative) capture of pollution on suitable sorbents. The POCIS type (a polar organic chemical integrative sampler), widely used samplers of suitable for capturing polar organic substances were chosen in this work. They were applied in eight consecutive sampling campaigns to cover the entire growing season. The aim was to assess the spatio-temporal dynamics (in monthly steps) of selected pesticides and their metabolites into five water supply reservoirs. Due to the scope of the obtained data, this article is focused on the presentation of the results water supply reservoirs Vír I, Opatovice and Ludkovice tributaries, which were monitored in 2021. If the sampling rate Rs was published, it was possible to recalculate the pollution captured by the passive sampler to the average concentration during the exposure. It was found out which tributaries into the reservoirs were loaded in the periods of the growing season by these hazardous substances. The results can be compared with the type of crops grown in a given year.