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| Titel |
Release of aged 14C-atrazine residues from soil facilitated by dry-wet cycles |
| VerfasserIn |
N. D. Jablonowski, K. Yu, S. Koeppchen, P. Burauel |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067202
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| Zusammenfassung |
| Intermittent dry-wet cycles may have an important effect on soil structure and aged pesticide
residues release (1). A laboratory study was conducted to assess the maximum potential of
water extractable aged atrazine residues influenced by soil drying and wetting. The used soil
was obtained from an outdoor lysimeter (gleyic cambisol; Corg: 1.45%), containing
environmentally aged (22 years) 14C-atrazine residues. For the experiment, soil from 0-10 cm
depth was used since most residual 14C activity was previously found in this layer (2,3).
Triplicate soil samples with a residual water content of approx. 8% were either dried (45Ë C)
prior water addition or directly mixed with distilled water (soil+water: 1+2, w:w). The
samples were shaken (150 rmp, 60 min, at 21Ë C), centrifuged (approx. 2000 g), and the
supernatants were filtered. Water-extracted residual 14C activity was detected via
liquid scintillation counter. The total water-extracted 14C activity (the amount of
residual 14C activity in a sample equals 100%) was significantly higher (p |
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