Vorlesungsreihe "Wissenschaft am UFZ" / Lecture Series "Research at the UFZ"

Plant protection products and their fate in agro-ecosystems

PD Dr. Peter Burauel

Forschungszentrum Jülich, Institut Agrosphäre / Agrosphere

Foto/Grafik

26. Juni 2012, 14:00 h, Leipziger KUBUS

In terrestrial systems, soils function as the major sorbent and sink for applied pesticides. This function depends on the quantity and quality of soil organic matter, the microbial activity and diversity, and the amount and accessibility of biogeochemical interfaces in soil. Soils are highly heterogeneous, complex and sensitive to changing environmental conditions and land use systems. These changes can influence persistence, bioaccessibility, and toxicity of pesticides. The behaviour of binding and remobilization of aged 14C-labelled pesticide molecules in soil and their physical as well as microbial remobilization potential will be highlighted in this presentation.
Aged xenobiotic residues are bound in several ways (sorption, hydrogen bonds, and covalent bonds) to the organic and inorganic soil matrix and may stay in the soil for many years [1, 2, 5]. Once formed, these so called non-extractable residues have the potential to be remobilized as a consequence of changes in environmental conditions, agricultural practices, soil chemistry, or due to microbially mediated release [4, 8, 9, 11]. For the elucidation of the long-term fate of pesticides it is beneficial to use isotope-labelling techniques. The use of outdoor lysimeter studies with 14C-labelled agrochemicals has been shown to be a useful approach to investigate the total loss of the compound and the chemical accessibility in function of time [3]. Achieved data allow new insights into the long-term fate of pesticides in soil as a basis for an improved environmental risk assessment. [6, 7].


References
[1] P. Burauel, F. Baßmann, Soils as filter and buffer for pesticides – experimental concepts to understand soil functions. Environ. Poll. 2005; 133/1, 11-16.
[2] P. Burauel, F. Führ, Formation and long-term fate of non-extractable residues in outdoor lysimeter studies. Environ. Poll. 2000; 108, 45-52.
[3] F. Führ, P. Burauel, W. Mittelstaedt, T. Pütz, U. Wanner, U., The lysimeter concept: A comprehensive approach to study the environmental behavior of pesticides in agroecosystems. In: Coats, J. R., Yamamoto, H. (Eds.) Environmental fate and effects of pesticides 2003;. ACS Symposium Series 853, Washington DC, pp. 1-29.
[4] B. Gevao, K.C. Jones, K.T. Semple, A. Craven, P. Burauel, Nonextractable pesticide residues in soil. Environ. Sci. Technol. 2003; 1, 139-144.
[5] N.D. Jablonowski, A. Schäffer, P. Burauel, Still present after all these years: Persistence plus potential toxicity raises questions about the use of atrazine. Environmental Science and Pollution Research, 2011; 18, 328-331. DOI 10.1007/s11356-010-0431-y
[6] N.D. Jablonowski, A. Linden, S. Köppchen, B. Thiele, D. Hofmann, W. Mittelstaedt, T. Pütz, P. Burauel, Long-term persistence of various 14C-labeled pesticides in soils. Environmental Pollution, 2012; 168, 29-36.
[7] N.D. Jablonowski, S. Koeppchen, D. Hofmann, A. Schäffer, P. Burauel, Spatial distribution and characterization of long-term aged 14C-labeled atrazine residues in soil. J. Agric. Food Chem. 2008; 56, 9548.
[8] N.D. Jablonowski, J. Modler, A. Schäffer, P. Burauel, Bioaccessibility of environmentally aged 14C-atrazine residues in an agriculturally used soil and its particle-size aggregates“. Environ. Sci. Technol. 2008; 42, 5904-5910.
[9] K.T. Semple, K.J. Doick, K.C. Jones, P. Burauel, A. Craven, H. Harms, Defining bioavailability and bioaccessibility of contaminated soil and sediment is complicated Environ. Sci. Technol. 2004; 38, 228-231.
[10] U. Wanner, F. Führ, P. Burauel, Influence of the amendment of corn straw on the degradation behaviour of the fungicide dithianon in soil. Environ. Poll. 2005; 133/1, 63-70.
[11] N.D. Jablonowski, A. Linden, S. Koeppchen, D. Goebbels, B. Thiele, D. Hofmann, and P. Burauel, Drying and wetting of soils and its influence on aged 14C-pesticide residues. Environ. Toxicol. and Chem., 2012, page doi:10.1002/etc.1851.

Vortragsfolien / Presentation slides (2.1 MB)

Allgemeine Anregungen, Fragen und Wünsche zur Reihe "Chemikalien in der Umwelt" bitte an Dr. Stefan Scholz stefan.scholz@ufz.de.