Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.watres.2021.117535
Lizenz creative commons licence
Titel (primär) Small streams – large concentrations? Pesticide monitoring in small agricultural streams in Germany during dry weather and rainfall
Autor Halbach, K.; Möder, M.; Schrader, S.; Liebmann, L.; Schäfer, R.B.; Schneeweiss, A.; Schreiner, V.C.; Vormeier, P.; Weisner, O.; Liess, M.; Reemtsma, T.
Quelle Water Research
Erscheinungsjahr 2021
Department ANA; OEKOTOX
Band/Volume 203
Seite von art. 117535
Sprache englisch
Topic T9 Healthy Planet
Keywords Neonicotinoids; Chlorothalonil; Field runoff; Groundwater; Surface water; Transformation products
UFZ Querschnittsthemen MOSES;
Abstract Few studies have examined the exposure of small streams (< 30 km2 catchment size) to agriculturally used pesticides, compared to large rivers. A total of 105 sites in 103 small agricultural streams were investigated for 76 pesticides (insecticides, herbicides, fungicides) and 32 pesticide metabolites in spring and summer over two years (2018 and 2019) during dry weather and rainfall using event-driven sampling. The median total concentration of the 76 pesticides was 0.18 µg/L, with 9 pesticides per sample on average (n = 815). This is significantly higher than monitoring data for larger streams, reflecting the close proximity to agricultural fields and the limited dilution by non-agricultural waters. The frequency of detection of all pesticides correlated with sales quantity and half-lives in water. Terbuthylazine, MCPA, boscalid, and tebuconazole showed the highest median concentrations. The median of the total concentration of the 32 metabolites exceeded the pesticide concentration by more than an order of magnitude. During dry weather, the median total concentration of the 76 pesticides was 0.07 µg/L, with 5 pesticides per sample on average. Rainfall events increased the median total pesticide concentration by a factor of 10 (to 0.7 µg/L), and the average number of pesticides per sample to 14 (with up to 41 in single samples). This increase was particularly strong for 2,4-D, MCPA, terbuthylazine, and nicosulfuron (75 percentile). Metabolite concentrations were generally less responsive to rainfall, except for those of terbuthylazine, flufenacet, metamitron, and prothioconazole. The frequent and widespread exceedance of the regulatory acceptable concentrations (RAC) of the 76 pesticides during both, dry weather and rainfall, suggests that current plant protection product authorization and risk mitigation methods are not sufficient to protect small streams.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24981
Halbach, K., Möder, M., Schrader, S., Liebmann, L., Schäfer, R.B., Schneeweiss, A., Schreiner, V.C., Vormeier, P., Weisner, O., Liess, M., Reemtsma, T. (2021):
Small streams – large concentrations? Pesticide monitoring in small agricultural streams in Germany during dry weather and rainfall
Water Res. 203 , art. 117535 10.1016/j.watres.2021.117535