Sulcotrione versus atrazine transport and degradation in soil columns.
A soil column experiment under outdoor conditions was performed to monitor the fate of 14C-ring-labelled sulcotrione, 2-(2-chloro-4-mesylbenzoyl)cyclohexane-1,3-dione and atrazine, 6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine, in water leachates and in the ploughed horizon of a sandy loam soil. Two months after treatment, the cumulative amounts of herbicide residues leached from the soil were 14.5% and 7% of the applied radioactivity for sulcotrione and atrazine, respectively. Maximum leachate concentrations for each herbicide were observed during the first month following application: 120 and 95 microg litre(-1) for sulcotrione and atrazine respectively. After 2 weeks, 78% of the sulcotrione and atrazine was extractable from the soil, whereas after two months only 10 and 4%, respectively, could be extracted. The maximum sulcotrione content in the first 10 cm of soil was identical with that of atrazine. For both molecules, the content of non-extractable residues was low, being around 15%. Sulcotrione seems to be more mobile than atrazine but the consequences for water contamination are similar since lower doses are used.
Cherrier
Richard
R
Laboratoire Sols et Environnement, INPL-ENSAIA/INRA, UMR 1120 avenue de la Forêt de Haye, BP 172, 54505 Vandoeuvre-lès-Nancy, France. richard.cherrier@lorraine.chambagri.fr
Boivin
Arnaud
A
Perrin-Ganier
Corinne
C
Schiavon
Michel
M
D001280:Atrazine / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002250:Carbon Radioisotopes; D003512:Cyclohexanones / Q000737:chemistry / Q000378:metabolism*; D006540:Herbicides / Q000737:chemistry / Q000378:metabolism*; D008698:Mesylates / Q000737:chemistry / Q000378:metabolism*; D010573:Pesticide Residues; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D013997:Time Factors
D002250:Carbon Radioisotopes; D003512:Cyclohexanones; D006540:Herbicides; D008698:Mesylates; D010573:Pesticide Residues; D012987:Soil; C079906:sulcotrione; D001280:Atrazine