Bedömning av faror som bekämpningsmedel utgör för Degebergas dricksvattentäkt - Perspektiv utifrån nuvarande markanvändning och vid en potentiell förändring

Sammanfattning: Pesticides poses a threat to drinking water, especially where the usage is extended, like in Scania, Sweden. The main objective of this study was to identify and characterize substances used in the cultivated area of Degeberga. By the help of interviews with roughly 70 % of the landowners, I identified used pesticides in the area and the soil properties of their lands. Using the geographic information system software ArcGIS, I then conducted a soil mapping. In the next step, I modeled the potential for leakage of these substances to the groundwater reservoir with regards to dependencies such as the soil properties and pesticide dosage. These simulations were done using MACRO-DB. Also, groundwater samples were taken according to the municipality monitoring program. Although the results showed no excess of joint EU limit values (0.1 μg/l), I proposed extended samplings in order to analyze additional pesticides which could occur in Degeberga depending on which crops that were being cultivated in the area. For every pesticide identified, an effects assessment was also done. This resulted, among other things, in a calculated acceptable daily intake, ADI for each pesticide towards humans. For those pesticides that were characterized, none fulfilled the criteria of being toxic, bio accumulative nor persistent according to the EU regulation Registration, Evaluation, Authorisation and Restriction of Chemicals, REACH. Nevertheless, this study needs a follow-up to make the risk analysis complete. A suitable approach would be to conduct an exposure assessment and a risk characterization. Keywords: groundwater, hazard assessment, soil mapping, pesticides