Chlorsulfuron Adsorption by Selected Soil Samples

Borggaard, Ole K.; Streibig, J. C.

doi:10.1080/00015128909438528

Cited by 15 publications

(7 citation statements)

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“…Linear and Freundlich models were fit to the prosulfuron isotherms measured on model sorbents and variable‐charge soils (Tables 2 and 3) The goodness of fit ( r 2 ) values for linear and Freundlich fits were greater than 0.95 in most cases with the exception of prosulfuron sorption by highly weathered subsurface Oxisols (A1) in 5 m M Ca(H 2 PO 4 ) 2 ( r 2 = 0.82), where prosulfuron sorption was low ( K d = 0.11 L kg −1 ). The Freundlich K f and linear sorption coefficient K d values are within the 95% confidence intervals in most cases, suggesting that a linear estimation is adequate within the range of equilibrium aqueous concentrations obtained in this study (0.4–7.3 μ M ), in agreement with several sulfonylurea sorption studies (Borggaard and Streibig, 1989; Ukrainczyk and Ajwa, 1996; Werkheiser and Anderson, 1996).…”

Section: Resultssupporting

confidence: 90%

“…However, anion exchange, hydrogen bonding, and charge transfer mechanisms have been shown to be significant for sorption by aluminum and iron oxides, clay minerals, humic acid, and anion exchange resins (Shea, 1986; Borggaard and Streibig, 1988). For variable‐charge minerals, Borggaard and Streibig (1989) observed chlorsulfuron sorption to be positively correlated with extractable Al and Fe oxide content as well as soil OC content in the range of 0.1 to 1.58%. For primisulfuron sorption, sorption was correlated with extractable Fe for lower OC soils (<1%), but not in high OC soils (>15%).…”

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confidence: 90%

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Factors Controlling Sorption of Prosulfuron by Variable‐Charge Soils and Model Sorbents

Hyun

Lee²

2004

J of Env Quality

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Prosulfuron [1-(4-methoxy-6-methyltriazin-2-yl)-3-[2-(3,3,3-trifluoropropyl) phenylsulfonyl]-urea), a relatively new sulfonylurea herbicide, is a weak acid (pK(a) 3.76), and therefore, will undergo pH-dependent speciation and sorption. Understanding prosulfuron sorption in soils is important for predicting its environmental fate. Soil and solution factors controlling sorption were investigated by measuring prosulfuron sorption on five model sorbents (amorphous silica, alpha-alumina, CaSWy1 montmorillonite, commercial humic acid, and anion exchange resin) and 10 variable-charge soils from CaCl(2) and Ca(H(2)PO(4))(2) solutions as a function of pH and ionic strength. Anion exchange of prosulfuron accounted for up to 82% of overall sorption in the pH range from 3 to 7. The relative importance of anion exchange to prosulfuron sorption was positively correlated to the ratio of anion and cation exchange capacities. Comparison between organic carbon (OC)-normalized sorption (K(oc)) versus pH for humic acid and variable-charge soils show similar trends with sorption decreasing with increasing pH. However, K(oc) values estimated from variable-charge soils in the lower pH range where anion exchange has the greatest contribution to sorption was almost one log unit greater than that estimated from humic acid clearly exemplifying the impact of anion exchange. Similarity in K(oc)-pH curves for humic acid and variable-charge soils may result from the fact that (i) cation exchange capacity increases with increasing OC content, thus effective anion exchange capacity is reduced; and (ii) the relative contribution of hydrophobic and hydrophilic sorption mechanisms was fairly constant. Given that both hydrophilic and hydrophobic sorption of prosulfuron decrease with increasing pH, addition of fertilizer and lime amendments may enhance the potential for off-site leaching of recently applied acidic pesticides.

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Section: Resultssupporting

confidence: 90%

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confidence: 90%

Factors Controlling Sorption of Prosulfuron by Variable‐Charge Soils and Model Sorbents

Hyun

Lee²

2004

J of Env Quality

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“…The phenomenum of negative adsorption has been reported earlier in studies concerning the sorption of acidic chemicals (Weber et al, 1965). Borggaard and Streibig (1989) reported negligible adsorption of CHL at pH >7-8, and similar results were found by Shea (1986) and . Additionally, experiments performed using soil thin-layer chromatography showed that CHL mobility was positively correlated with pH (Mersie and Foy, 1986).…”

Section: Sorptionsupporting

confidence: 87%

Sorption of Tribenuron-methyl, Chlorsulfuron, and Imazamethabenz-methyl by Soils

Álvarez-Benedí

Cartón

Torres

1998

J. Agric. Food Chem.

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The sorption at 25°C of the acidic herbicides tribenuron-methyl, chlorsulfuron, and imazamethabenzmethyl on three soils (clay content percentages ranging from 7.2 to 54.6, pH values ranging from 6.5 to 7.6, and organic matter percentages <1.5) was studied. Only imazamethabenz-methyl presented significant sorption in these soils. Sorption isotherms of imazamethabenz-methyl were well correlated to the Freundlich model, although linearity can be reasonably assumed. Desorption studies of this herbicide presented remarkable hysteresis and nonlinearity. Chlorsulfuron sorption was low, and tribenuron-methyl presented negligible or negative adsorption. The effect of the soil/ solution ratio employed in batch experiments on the estimated distribution coefficient of the three herbicides was also investigated. By changing the soil/solution ratio from 1:3 to 1:1, an increase in the distribution coefficient of imazamethabenz-methyl and chlorsulfuron was observed. On the other hand, the distribution coefficient of tribenuron-methyl decreased within the same range of soil/ solution ratios. Results indicate that these herbicides, but especially chlorsulfuron and tribenuronmethyl, could be mobile in the soils studied. The effect of the soil/solution ratio or hysteresis in desorption seems to be more important than the isotherm nonlinearity in modeling the transport of these hebicides in soil.

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“…This indicates that organic matter may be the primary binding factor reducing bioavailability in a soil system. Soil organic matter content has been positively correlated to sulfonylurea sorption (4,13). Sugarbeet response was not correlated with pH in the range of these growth chamber experiments (pH 6.4 to 8.1) (Table 4).…”

Section: Resultsmentioning

confidence: 86%

Sugarbeet (Beta vulgaris) Response to and Sorption Characteristics of Nicosulfuron and Primisulfuron

et al. 1995

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Nicosulfuron and primisulfuron are sulfonylurea herbicides that may persist in the soil and injure sensitive rotational crops such as sugarbeet. Studies were initiated to measure sugarbeet response one and two years after application of 70 and 140 g/ha of nicosulfuron and 40 and 80 g/ha of primisulfuron to corn. Nicosulfuron did not injure sugarbeet one or two years after application. In contrast, sugarbeet yield was reduced one year after application of 40 and 80 g/ha of primisulfuron. Injury was visible two years after application of 80 g/ha primisulfuron but this did not cause a yield reduction. In greenhouse studies, the concentration of nicosulfuron and primisulfuron that reduced sugarbeet growth by 50% were determined for six soils. Primisulfuron reduced sugarbeet growth more than nicosulfuron on four of six soils indicating greater potential for sugarbeet injury from primisulfuron. Sugarbeet response was highly correlated with soil organic matter content (R2= 0.88). The sorption coefficients, Kdvalues, for nicosulfuron were 0.30 to 2.58 and the Kdvalues for primisulfuron were 0.76 to 3.47. Primisulfuron Kdvalues were higher than those of nicosulfuron on four of five soils indicating stronger affinity of primisulfuron for soil sorptive sites. The Kdvalues for both herbicides indicate low overall sorption. The greater sugarbeet injury observed in the field from primisulfuron is not due to greater availability of primisulfuron compared to nicosulfuron.

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Chlorsulfuron Adsorption by Selected Soil Samples

Cited by 15 publications

References 29 publications

Factors Controlling Sorption of Prosulfuron by Variable‐Charge Soils and Model Sorbents

Factors Controlling Sorption of Prosulfuron by Variable‐Charge Soils and Model Sorbents

Sorption of Tribenuron-methyl, Chlorsulfuron, and Imazamethabenz-methyl by Soils

Sugarbeet (Beta vulgaris) Response to and Sorption Characteristics of Nicosulfuron and Primisulfuron

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