ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
N ,N-diethylpropionamide] through soil via DOM. Soils were sieved, packed in columns, and treated at the surface with 14C-labeled napropamide. Water was applied to the columns by flooding and leachate was collected. It was found that 14C-labeled napropamide was present in the first 0.22 cm of leachate. The 14C and DOM concentrations were highest in the initial leachate and decreased with increasing leachate. Napropamide concentration fell below detection at some depth in all columns and recovery in the soil averaged 95% of the applied napropamide. Gas chromatographic analyses verified that 14C activity in the leachate was associated with napropamide. A dialysis equilibrium technique determined that 17 to 56% of the napropamide in the leachate was retained inside a 500-Da dialysis membrane. The rapid leaching of a small fraction of napropamide was not a result of preferential flow in our experiments but is due to DOM-facilitated transport. Thus, under field conditions rapid pesticide leaching could be the combined effects of preferential flow and facilitated transport.
Type of Medium:
Electronic Resource
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