Bestimmung von Pflanzenschutzmitteln im Stammablaufwasser von Buchen (Fagus Sylvatica L.)

2002 
Concentrations of pesticides, used in high amounts in Europe (isoproturon, 2,4-dichlorophenoxy acetic acid (2,4-D), atrazine, chlortoluron, bromoxynil, terbuthylazine, metamitron, bentazone, ethofumesat, metazachlor, pendimethalin, phenmedipham, desethyl-atrazine (DEA) and desisopropyl-atrazine (DIA)) were determined in stemflow of beeches and in rainwater in the northern low-lands of Germany. Recoveries after solid phase extraction of all compounds varied in a wide range in spiked stemflow samples with respect to the individual compounds as well as to different trees. In this investigation results from a single rainfall event on 25 September 2000 are presented. Sampling was performed approximately two weeks after sowing of winter wheat and application of pesticides. In analysed stemflow as well as in rainfall samples concentrations of isoproturon in a range from 90 to 360 ng/L were found. In two of three stemflow samples metazachlor was detectable in concentrations of about 200 ng/L. Additionally, ethofumesat was found in one of the stemflow samples in a concentration of ca. 270 ng/L. However, concentrations found for ethofumesat (a typical beet-herbicide applied only in spring) are still without interpretation.
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