Leaching of Diuron, Linuron and their main metabolites in undisturbed field lysimeters - Université de Lorraine Access content directly
Journal Articles Journal of Environmental Science and Health, Part B Year : 2008

Leaching of Diuron, Linuron and their main metabolites in undisturbed field lysimeters

Ahde El Imache
  • Function : Author
Btissam Elamrani
  • Function : Author
Fironzo Pozzonni
  • Function : Author
Lucia Guzzella
  • Function : Author

Abstract

The increasing use of pesticides in Morocco raises the potential risk of groundwater contamination, notably in the Gharb area, which has a shallow groundwater table. Thus, the leaching of two phenyl-ureas, diuron and linuron and their metabolites through undisturbed soil columns was studied under outdoor conditions. The soil chosen is a loamy clay soil, representative of the Gharb agricultural area. After four irrigation events were applied from 31/03/2005 to 15/05/2005, leachates contained higher amounts of linuron (from 0.08% to 6.96% of applied linuron) than diuron (from 0% to 0.27%). The greater mobility of linuron might be related to its higher water solubility (64 mg • L −1 compared with 42 mg • L −1 for diuron) and smaller adsorption coefficient (K oc of 400 L • kg −1 , compared with 480 L • kg −1 for diuron). Concerning their metabolites, greater amounts of, N-(3,4-dichlorophenyl)-N, (DCPMU) than N-3,4-dichlorophenylurea (DCPU) were detected N-dimethylurea in the percolates, from 0% to 0.046% and from 0% to 0.008%, respectively. At the end of the monitoring period, more linuron residues than diuron residues were recovered in the soil profiles, 25.02% and 16.41%, respectively. The diuron residues were found mainly in the 0-20 cm soil layer, whereas linuron residues reached the 20-40 cm soil layer. Under such experimental conditions, linuron leaching, and thus its potential to contaminate groundwater, is greater than that of diuron.
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Dates and versions

hal-03551660 , version 1 (07-09-2022)

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Ahde El Imache, Abdelmalek Dahchour, Btissam Elamrani, Sylvie Dousset, Fironzo Pozzonni, et al.. Leaching of Diuron, Linuron and their main metabolites in undisturbed field lysimeters. Journal of Environmental Science and Health, Part B, 2008, 44 (1), pp.31-37. ⟨10.1080/03601230802519579⟩. ⟨hal-03551660⟩
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