Fate of a sulfonylurea herbicide in an alluvial soil, as shown by experimental degradation of pyrimidine-2-14C-labeled rimsulfuron

Metzger, Laure; Munier-Lamy, Colette; Choné, Thérèse; Belgy, M.-J.; Andreux, F.; Védy, J.-C.

doi:10.1016/0045-6535(96)00215-9

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…This phenomenon is of primary importance especially when small amounts of a herbicide are employed in soil weed control (Schneiders et al, 1993). In addition, the low persistence time makes difficult to determine any indirect effects on soil microflora mainly for herbicides, such as rimsulfuron, applied at very low field rates (Metzger et al, 1996;Sabatini et al, 1998;Accinelli et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

“…However, the effects obtained in our studies may be influenced by the degree of soil disruption and also by the species of the fungi present in the soil. Several studies (Metzger et al, 1996;Perucci and Scarponi, 1996;Startton and Stewart, 2002;Ratcliff et al, 2006 ) on soil microflora have shown that soil characteristics may modify the effect of pesticides on microbial numbers and their biological activity. This is in accordance with our research.…”

Section: Resultsmentioning

confidence: 99%

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Rimsulfuron in soil: Effects on microbiological properties under varying soil conditions

2011

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SUMMARYThe effects of rimsulfuron a sulfonylurea herbicide on the growth and activity of soil microorganisms under laboratory conditions was investigated in two soils.The application rates were: 0.2, 2.0 and 20.0 mg a.i kg -1 soil. The lowest concentration tested was the label rate (0.2 mg a.i kg -1 ), and the other two were ten and hundred times higher. No adverse effects on microbiological processes were observed for the label rate. Decrease in microbial biomass carbon, dehydrogenase activity, fungi and bacteria in comparison with untreated control, were found at higher rates. The magnitude of these effects were generally slight and transitory.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rimsulfuron in soil: Effects on microbiological properties under varying soil conditions

2011

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“…T he more recent herbicide formulations are designed to offer advantages of the highest selectivity together with the lowest persistence in the environment: sulfonylurea herbicides meet these requirements. But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors [1][2][3][4][5]. The evaluation of the degradation pathway and the structures and toxicity of the degradation products is therefore of paramount importance.…”

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confidence: 99%

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Bottaro

Frascarolo

Gosetti

et al. 2008

J. Am. Soc. Mass Spectrom.

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The©paper©studies,©with©the©help©of©HPLC-DAD-MS/MS©technique,©the©hydrolytic©and photoinduced©degradation©processes©that©take©place©in©aqueous©solutions©of©tribenuron methyl,© both© when© preserved© in© the© dark© and© when© undergoing© solar© box© irradiation© under conditions© that© simulate© sun© light.© The© results© indicate© that© the© degradation© products© formed by© hydrolysis© alone© and© by© photoirradiation© are© the© same,© but© kinetics© of© the© hydrolysis reaction©is©much©slower.©The©degradation©products©are©identified©as©2-methoxy-4-methylamino-6-methyl-1,3,5-triazine© (P1),© methyl© 2-aminosulfonylbenzoate© (P2),© and© saccharin© (P3)© and© quantified.© Ecotoxicological© biotests© performed© on© 0.1© g L Ϫ1 photoirradiated solutions of the herbicide give a border line toxicity situation comparable to that of the precursor and indicate that the herbicide is characterized by low persistence in the environment, as required. Its degradation, however, does not lead to mineralization but to the formation of products of comparable toxicity. To evaluate the matrix effects, the photodegradation of the herbicide is also studied in the presence of rice paddy waters: the process is slower than in ultrapure water but leads to the same products. Experiments performed for comparison by irradiating ultrapure water solutions with UV lamp (254 nm) show that the degradation process is not only faster with respect to sunlight, but gives a different pathway, without in anyway leading to mineralization. T he more recent herbicide formulations are designed to offer advantages of the highest selectivity together with the lowest persistence in the environment: sulfonylurea herbicides meet these requirements. But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors [1][2][3][4][5]. The evaluation of the degradation pathway and the structures and toxicity of the degradation products is therefore of paramount importance.The natural degradation of sulfonylurea herbicides takes place through aqueous hydrolysis reactions [6 -8], microbial processes (mainly occurring in soils) [9 -11], or photodegradation reactions [1-3, 5, 12-14]. These processes in surface waters and in soil are concomitant [7,15,16].HPLC-DAD-MS/MS methods are employed here to investigate and compare the hydrolytic and photoinduced degradation pathways of aqueous solutions of tribenuron methyl (methyl [2-4-methoxy-6-methyl-1,3,5-triazin-2-yl(methyl)carbamoyl sulfamoyl]benzoate) (Scheme 1), largely used against broad-leaved weeds in crops of cereals and in particular of rice.TiO 2 assisted photodegradation often leads to complete mineralization and can be used to dissipate pollutants in remediation strategy [17][18][19][20]. We are interested here to study the natural photodegradation of tribenuron methyl in...

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“…However, the effects obtained in our studies may be influenced by the degree of soil disruption and also by the species of the fungi present in the soil. Several studies [11,21,25,26] on soil microflora have shown that soil characteristics may modify the effect of pesticides on microbial numbers and their biological activity .…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon is of primary importance especially when small amounts of a herbicide are employed in soil weed control [27]. In addition, the low persistence time makes it difficult to determine any indirect effects on soil microflora mainly for herbicides, such as herbicide s, applied at very low field rates [14,15,26].…”

Section: Resultsmentioning

confidence: 99%

Effects of Metsulfuron-Methyl on Soil Microbial Acitvity

Radivojević¹,

Jovičić²,

Šantrić³

et al. 2014

AFST

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Pesticide metsulfuron-methyl (chemical name: methyl 2-(4-methoxy-6-methyl-1,3,5-triazin-2- ylcarbamoylsulfamoyl)benzoate) is a post-emergence sulfonylurea herbicide which controls most annual grass broadleaf weeds in cereals, and it has been used for a long time.The effect of metsulfuron-methyl on microbiological activity in soil was investigated. Trials were set up in laboratory on chernozem soil (pH 7.0, organic matter 3.5%, sand 26%, silt 45%, clay 29%) at Surcin, Serbia. Metsulfuron-methyl was added at rates 1, 5, 25 i 50 mg/kg soil. Untreated soil served as control. Samples were collected for analysis 5, 20, 40 and 60 days after metsulfuron-methyl application. The effects were assessed on dehydrogenase activity, bacteria abundance and fungi abundance.Metsulfuron-methyl was found to cause different effects on the soil microbial activity in soil and its influence depended on the rate of application and duration of activity. Metsulfuron-methyl applied at 1 and 5 mg/kg soil did not have any effect on microbial parameters. The higher herbicide doses (25 and 50 mg/kg) induced increasing activity from the 5th to 40th day. These experimental data indicated that metsulfuron-methylon affected soil microbial activity, but the effects were only detected at higher doses and they were slight and transitory.

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Fate of a sulfonylurea herbicide in an alluvial soil, as shown by experimental degradation of pyrimidine-2-14C-labeled rimsulfuron

Cited by 17 publications

References 19 publications

Rimsulfuron in soil: Effects on microbiological properties under varying soil conditions

Rimsulfuron in soil: Effects on microbiological properties under varying soil conditions

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Effects of Metsulfuron-Methyl on Soil Microbial Acitvity

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