Properties of sulfometuron methyl affecting its environmental fate: aqueous hydrolysis and photolysis, mobility and adsorption on soils, and bioaccumulation potential

Harvey, John; Dulka, J. J.; Anderson, Jeffrey J.

doi:10.1021/jf00064a009

Cited by 81 publications

(79 citation statements)

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“…The breakthrough curves of the commercial and clay-based formulations of SFM are shown in Figure 2. The total recovery of SFM from the commercial formulation amounts to 99.2 ( 0.3%, which is in agreement with previous studies indicating low adsorption of sulfonylureas in most agricultural soils, due to their presence as anionic forms (pH > 6) which results in their minimal adsorption on soil colloids (18). Though an increase in the organic matter content enhances the adsorption of sulfonylureas to soil particles, the organic mater content of the soil used (0.92%) is typical for most of the agricultural soils used in Mediterranean areas, indicating a high leaching potential in these soils.…”

Section: Resultssupporting

confidence: 91%

Slow-Release Formulations of Sulfometuron Incorporated in Micelles Adsorbed on Montmorillonite

Mishael

Undabeytia

Rabinovitz

et al. 2002

J. Agric. Food Chem.

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The design and tests of slow-release formulations of sulfometuron (SFM), an anionic sulfonylurea herbicide, are described. The formulations are based on incorporation of the herbicide in octadecyltrimethylammonium (ODTMA) micelles, which adsorb on a clay mineral, montmorillonite. An optimization of herbicide/micelle clay ratios yielded high adsorption of SFM (95%), and at a 1% (w/ w) water suspension only 0.5% of the adsorbed SFM was released at times varying from hours to 9 days. An analytical test in Seville soil showed that under excessive irrigation (400 mm) 100% of the commercial formulation leached, whereas the micelle-clay formulations showed only 50-65% elution. A plant bioassay in Rehovot soil showed that the commercial dispersible granule formulation (Oust, 75% ai sulfometuron methyl) yielded only 23% root elongation inhibition at the top 5 cm of the soil, whereas complete inhibition was achieved with the micelle-clay formulation. The detected concentration of SFM for the micelle-clay formulation at a depth of 15-20 cm was half of that detected for the commercial one, indicating a reduction in leaching when applying the micelle-clay formulation. A 10-fold reduction in the applied dose of SFM in the micelle-clay formulations resulted in good herbicidal activity of 60-87% inhibition. These characteristics make the new formulation promising from the environmental and economic points of view.

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Section: Resultssupporting

confidence: 91%

Slow-Release Formulations of Sulfometuron Incorporated in Micelles Adsorbed on Montmorillonite

Mishael

Undabeytia

Rabinovitz

et al. 2002

J. Agric. Food Chem.

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“…The high water volume leached through the column may have provided similar soil solution pH and sulfometuron solubility in the saturated-flow conditions for all soil types thus allowing for similar sulfometuron movement. These data are in agreement with soil TLC and other soil column studies in which sulfometuron was intermediate to highly mobile (Harvey et al, 1985;Wehtje et al, 1987). However, an unrealistically high water volume for one application was used in this experiment.…”

Section: Movement and Persistence In Soilsupporting

confidence: 91%

“…2B) The difference in sulfometuron mobility in the three soil types was probably related to the differences in soil pH. Sulfometuron mobility increases as soil pH increases (Harvey et al, 1985). The Fairdale silty loam pH was 7.8 while the Barnes stony loam and Felor loam pH was 6.8 and 6.1, respectively (Table 1).…”

Section: Movement and Persistence In Soilmentioning

confidence: 95%

“…Two breakdown products were also detected, Sulfometuron-metabolite I (Rf = 0.25) and Sulfometuron-metabolite II, which remained at the origin (Rf = 0). Sulfometuron-metabolite I may be methyl 2-(aminosulfonyl)benzoate and Sulfometuron-metabolite II could be saccharin, which are the major degradation products of sulfometuron (Harvey et al, 1985); however, these compounds were not investigated further in this study. Degradation to more polar materials was indicated because the amount of original 14 C extracted into acetonitrile decreased from an average of 104 to 73% after 1 and 21 days, respectively.…”

Section: Hydrolysis and Photolysismentioning

confidence: 99%

“…Sulfometuron is degraded by hydrolysis and microorganisms in soil and has an average half-life of 4 weeks in acidic soil (Harvey et al, 1985). Hydrolysis seems to predominate during the initial degradation of sulfometuron in acidic soils.…”

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confidence: 99%

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Sulfometuron Persistence and Movement in Soil and Water in North Dakota

Lym

Swenson

1991

J of Env Quality

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Abstract:The lateral movement, soil persistence and aqueous hydrolysis of sulfometuron [2-([{[(4,6-dimethyl-2-pyrimidinyl) from slopes to nontarget areas was minimal and was not detected in the 0-to-30-cm-soil depth, when sampled up to 120 cm downslope from the treated area on 2, 8, or 16% slopes 1 year after treatment. The highest sulfometuron concentration found downslope from the treated area was less than 1 µg kg -1 regardless of the slope. Sulfometuron moved beyond the soil column (70 cm deep) in Fairdale loam [fine-loamy, mixed (calcareous), frigid, Mollic Udifluvents], Felor silty clay loam (fine-loamy, mixed, Typic Agriborolls), and Barnes stony loam (fine-loamy, mixed, Udic Haploborolls) soils when leached with 45.7 cm of water for 48 hours compared to only 35 to 50 cm deep when leached with the same amount of water over 9 weeks. Sulfometuron degradation increased as soil temperature and moisture increased. Sulfometuron was detected for an average of 429 days in Felor silty clay loam at pH 6.1, 8º C, and 45% field capacity but only 218 days in the same soil at 90% field capacity and 16º C. Degradation was slower in Renshaw and Sioux sandy loam [(undifferentiated soil mixture) fine-loamy over sandy or sandy skeletal, mixed Udic Haploborolls and sandy-skeletal, mixed Udortheutic Haploborollsl with a pH of 7.4 and averaged >700 days, regardless of environmental conditions. Sulfometuron hydrolysis was similar regardless of solution pH with an average of 63% 14 C-sulfometuron remaining after 28 days in water at pH 5, 7,

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Fate of metsulfuron-methyl in soils in relation to pedo-climatic conditions

Pons¹,

Barriuso

1998

Pestic. Sci.

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The dependence of the behaviour of metsulfuron-methyl on soil pH was conÐrmed during incubations under controlled laboratory conditions with two French soils used for wheat cropping. The fate of [14C] residues from [triazine-14C]metsulfuron-methyl was studied by combining di †erent experimental conditions : soil pH (8É1 and 5É2), temperature (28 and 10¡C), soil moisture (90 and 50% of soil water holding capacity) and microbial activity (sterile and nonsterile conditions). Metsulfuron-methyl degradation was mainly inÑuenced by soil pH and temperature. The metsulfuron-methyl half-life varied from Ðve days in the acidic soil to 69 days in the alkaline soil. Under sterile conditions, the half-life increased in alkaline soil to 139 days but was not changed in the acidic soil. Metsulfuron-methyl degradation mainly resulted in the formation of the amino-triazine. In the acidic soil, degradation was characterised by rapid hydrolysis giving two speciÐc unidentiÐed metabolites, not detected during incubations in the alkaline soil. Bound residues formation and metsulfuron-methyl mineralisation were highly correlated. The extent of bound residue formation increased when soil water content decreased and was maximal [48 (^4)% of the applied metsulfuron-methyl after 98 incubation days] in the acidic soil at 50% of the water holding capacity and 28¡C. Otherwise, bound residues represented between 13 and 32% of the initial radioactivity.1998 SCI ( Pestic. Sci., 53, 311È323 (1998)

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Properties of sulfometuron methyl affecting its environmental fate: aqueous hydrolysis and photolysis, mobility and adsorption on soils, and bioaccumulation potential

Cited by 81 publications

References 0 publications

Slow-Release Formulations of Sulfometuron Incorporated in Micelles Adsorbed on Montmorillonite

Slow-Release Formulations of Sulfometuron Incorporated in Micelles Adsorbed on Montmorillonite

Sulfometuron Persistence and Movement in Soil and Water in North Dakota

Fate of metsulfuron-methyl in soils in relation to pedo-climatic conditions

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