| Title | Leaching of Diuron, Linuron and their main metabolites in undisturbed field lysimeters |
| 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. |
| Source | Journal of environmental science and health. Part B. Pesticides, food contaminants, and agricultural wastes 44 (1), pp. 31–37 |
| Journal | Journal of environmental science and health. Part B. Pesticides, food contaminants, and agricultural wastes |
| Editor | Taylor & Francis,, Philadelphia, PA,, Stati Uniti d'America |
| Year | 2009 |
| Type | Articolo in rivista |
| DOI | 10.1080/03601230802519579 |
| Authors | IMACHE A.L., DAHCHOUR A., ELAMRANI B., DOUSSET S., POZZONI F., GUZZELLA L. |
| Text | 42310 2009 10.1080/03601230802519579 ISI Web of Science WOS 000261765600005 Leaching of Diuron, Linuron and their main metabolites in undisturbed field lysimeters IMACHE A.L., DAHCHOUR A., ELAMRANI B., DOUSSET S., POZZONI F., GUZZELLA L. IMACHE A.L.,ELAMRANI B., Universita, Hassan II, Casablanca DAHCHOUR A., Istituto di Agronomia e Veterinaria Hassan II, Rabat DOUSSET S., LIMOS, Francia POZZONI F., GUZZELLA L., CNR IRSA, Brugherio MB 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. 44 articolo Art_Dahchour.pdf Articolo in rivista Taylor Francis, 0360 1234 Journal of environmental science and health. Part B. Pesticides, food contaminants, and agricultural wastes Journal of environmental science and health. Part B. Pesticides, food contaminants, and agricultural wastes J. environ. sci. health, Part B, Pestic. food contam. agric. wastes Journal of environmental science and health Pesticides, food contaminants, and agricultural wastes POZZONI FIORENZO liciamaria.guzzella GUZZELLA LICIA MARIA TA.P04.021.005 Tendenze evolutive della qualita dei corpi idrici superficiali e sotterranei correlazione causa effetto e caratterizzazione. |
