Study on the mineralization and degradation of isoproturon in three soils

Pieuchot, M.; Perrin-Ganier, Corinne; Portal, Jean‐Michel; Schiavon, Michel

doi:10.1016/0045-6535(96)00181-6

Cited by 49 publications

(39 citation statements)

References 9 publications

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“…After two months of incubation 32.4% of the initially applied radioactivity was released from soil M, versus 26.1% and 25.9% for soils R and CM, respectively. The differences in mineralisation of 14 C-sulcotrione could be explained by a variance in the amount of available substrate in the three soils. Where accessible substrate was scarce, microflora mineralised principally 14 C-sulcotrione.…”

Section: Mineralisation Of Sulcotrionementioning

confidence: 99%

“…1 ml of the herbicide sulcotrione (MW: 328.77; solubility in water: 0.165 g·l -1 at 25 °C) 14 C-ring-labelled (specific radioactivity: 0.41 MBq·mg -1 ; 90% purity; impurity 10% of CMBA, Izotop) dissolved in methanol solution was dripped onto the soil surface, that represents 0.127 mg of sulcotrione and 51.6 kBq per sample (equivalent to 450 g·ha -1 ). The water supply was calculated for each soil in order to obtain samples with an 80% moisture content, which is equivalent to the soil retention capacity of water.…”

Section: Treatmentsmentioning

confidence: 99%

“…The non-extractable 14 C residues were evaluated by combustion twice with 300 mg of each soil sample, to which 100 mg of cellulose were added. The soil was combusted for 14 CO 2 determination with a Packard Oxidizer 307.…”

Section: Evaluation Of Sulcotrione Non-extractable Residuesmentioning

confidence: 99%

“…The soil was removed by centrifugation at 4642 g for 25 min. The amount of extractable 14 C herbicide residue in the supernatant solution was evaluated twice by liquid scintillation counting on 1 ml in 10 ml Ultima Gold scintillator. The extractions were stopped when the radio activity detected corresponded to twice the noise background (60 dpm).…”

Section: Evaluation and Analysis Of Extractable Residuesmentioning

confidence: 99%

“…The aims of this work were first to investigate the kinetic degradation of sulcotrione with batch biodegradation in soil samples presenting the same chemical and physical properties but with a different agricultural past [3,10,13,14]. Secondly, we tried to observe the stabilisation process of sulcotrione in the soil, on the one hand through the examination of the evolution of sulcotrione availability at extraction [11,12], and on the other, with the evaluation of non-extractable sulcotrione residues [6,9,18].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of sulcotrione in a brown soil amended with various organic matters

2004

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-We investigated sulcotrione degradation in a sandy-silty brown soil. The agricultural field was divided into three small plots ten years ago, named plots R for reference, M for manure and CM for compost manure. The degradation experiment was conducted under controlled laboratory conditions using 14 C benzene uniformly ring-labelled sulcotrione. In the first month of the experiment, 80% of the residues was extractable with solvent, 55% of sulcotrione was degraded, including 45% into 2-chloro-4-methylsulfonylbenzoïc acid (CMBA), the most abundant metabolite of sulcotrione. 10% of the residues was mineralised. After two months, 40% of the residues was extractable, including 16% of sulcotrione, 25% was mineralised and 35% formed non-extractable residues. Soil amended with different organic matters favoured transformation of sulcotrione in soil. The fresh manure amendment activated mineralisation of 10%, and the compost manure amendment induced a lower ratio of extractable sulcotrione at a level of 5%.sulcotrione / degradation / persistence / soil / organic amendments / mineralisation Résumé -Dégradation de la sulcotrione dans un sol brun amendé avec différents apports organiques. La dégradation de la sulcotrione dans le sol a été évaluée en conditions de laboratoire à l'aide de la molécule uniformément marquée au 14 C sur le noyau benzénique. Le sol utilisé présente une texture limono-sableuse et est issu d'une parcelle divisée en trois sous parcelles recevant différents apports organiques depuis dix ans. Les terres issues de ces trois sous parcelles sont nommées respectivement terre R (référence), M (fumier) et CM (fumier composté). Lors du premier mois d'expérimentation 80 % des résidus restent extractibles, 55 % de la sulcotrione est dégradée dont 45 % en CMBA (2-chloro-4-methylsulfonylbenzoïc acide) son métabolite majeur. Seul 10 % des résidus sont minéralisés. Au bout de deux mois, 40 % des résidus sont extractibles au solvant dont 16 % de sulcotrione, 25 % sont minéralisés et 35 % forment des résidus non-extractibles. Lors d'amendements organiques, la transformation de la sulcotrione dans le sol est favorisée. L'apport de fumier active de 10 % la minéralisation des résidus et l'apport de fumier composté induit un ratio de sulcotrione extractible faible de l'ordre de 5 %.sulcotrione / dégradation / persistance / sol / amendement organique / minéralisation

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Section: Mineralisation Of Sulcotrionementioning

confidence: 99%

Section: Treatmentsmentioning

confidence: 99%

Section: Evaluation Of Sulcotrione Non-extractable Residuesmentioning

confidence: 99%

Section: Evaluation and Analysis Of Extractable Residuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation of sulcotrione in a brown soil amended with various organic matters

2004

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Controlled release of isoproturon from an alginate–bentonite formulation: water release kinetics and soil mobility

et al. 2000

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The herbicide isoproturon [3-(4-isopropylphenyl)-1,1-dimethylurea] was incorporated in alginate-based granules to obtain controlled-release (CR) properties. The basic formulation (sodium alginate (1.87%)±isoproturon (0.67%) in water) was modi®ed by addition of different sorbents. The effect on isoproturon release rate, modi®ed by the incorporation of natural and acid-treated bentonite in alginate formulation, was studied by immersion of the granules in water while shaking. The release of isoproturon was diffusion-controlled. The time taken for 50% of the active ingredient to be released into water, T 50 , was longer for those formulations containing added bentonite (5.98 and 7.43 days, for natural and acid-treated (1 M H 2 SO 4 ) bentonite, respectively) than for the preparation without bentonite (3.78 days). The mobilities of non-formulated technical grade (98%) and formulated isoproturon were compared using soil columns. The use of alginate-based CR formulations containing bentonite reduced isoproturon movement compared with the technical product. Sorption capacity of the soil for isoproturon was measured using batch experiments (0.29 litre kg À1 ) and the results obtained here in agreement with those obtained under dynamic conditions.

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Isoproturon

Schmidt

2004

Bodengefährdende Stoffe: Bewertung ‐ Stoffdaten ‐ Ökotoxikologie ‐ Sanierung

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Das Herbizid Isoproturon (CAS‐Nr.: 34123‐59‐6, auch 3‐p‐Cumenyl‐1,1‐dimethylharnstoff) ist ein zugelassenes, systemisches Boden‐ und Blattherbizid, das selektiv in toleranten Kulturen (z. B. Weizen, Gerste, Roggen) eingesetzt wird und 1974 auf den Markt gelangte. Neben der Reinsubstanz ist es teilweise in verschiedenen Mischprodukten mit weiteren Herbiziden enthalten. Das Herbizid wirkt durch Inhibierung der Photosynthese (PS II). In Böden wird Isoproturon bei praxisüblichen Aufwandmengen weitgehend abgebaut. Mit Ausnahme von Pflanzen und Algen ist die toxische Wirkung auf Organismen gering.

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Study on the mineralization and degradation of isoproturon in three soils

Cited by 49 publications

References 9 publications

Degradation of sulcotrione in a brown soil amended with various organic matters

Degradation of sulcotrione in a brown soil amended with various organic matters

Controlled release of isoproturon from an alginate–bentonite formulation: water release kinetics and soil mobility

Isoproturon

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