Abstract
Pesticides can get in drinking water sources above all by means of agricultural activities, and they can negatively affect not only the environment but also our health. Adsorption is one of the water treatment processes used for pesticide removal from water. Our laboratory trial studying removal of pesticides from raw water used the sorption process on two selected sorbents. The laboratory experiment was performed at the Institute of Municipal Water Management, Faculty of Civil Engineering, Brno University of Technology. Charcoal was one of the sorbents, used in the form of Filtrasorb F100. The other sorbent was Bayoxide E33, selected due to its favourable results in removal of metals from water. The measured values suggest that Filtrasorb F100 reduced concentrations of most pesticides down to the lower limit of measurability. Only pesticide metazachlor ESA showed continuous increase of concentration in the course of the filtration. Bayoxide E33 was unable to remove pesticides. Most pesticides were desorbed by the material after a time, only in the case of two pesticides (atrazin-2-hydroxy and terbuthylazin-desethyl-2-hydroxy) concentrations were reduced down to the limit of measurability.
Highlights
Pesticides are biocides used for plant protection in agriculture and forestry against fungi, weeds and pests
Pesticides can get in drinking water sources above all by means of agricultural activities, and they can negatively affect the environment and our health
The measured values suggest that the Filtrasorb F100 sorption material reduced concentrations of most pesticides down to the lower limit of measurability (LOQ – limit of quantification), i.e. the concentrations measurable by the selected analytical assay
Summary
Pesticides are biocides used for plant protection in agriculture and forestry against fungi, weeds and pests They form a large group of substances classified according to their biological effect and chemical type of the active agent. If frequent or heavy rains occur in the period of pesticide application the substances contained in them may be quickly washed off from the surface or from the underground layers of the soil. Their surface or underground wash off supplies them to water courses where their concentrations are higher but the periods of their increased concentrations are relatively lower.
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