Adsorption of the herbicide acifluorfen on humic acids

Ruggiero, P.; Crecchio, Carmine; Mininni, Rosa Maria; Pizzigallo, Maria

doi:10.1016/0048-9697(92)90136-g

Cited by 13 publications

(23 citation statements)

References 7 publications

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“…19-27 The V value for solute 10 is similar to our 〈V A 〉 value at pH 3.2 but drops sharply with increasing pH. 23 The V value for 11 at 35°C also resembles 〈V A 〉 for our solutes, but it increases with increasing temperature. 20 The site capacity for 13 24 is roughly the average of our 〈V A 〉 and 〈V C 〉 values.…”

Section: Resultssupporting

confidence: 59%

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Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 1. Naturally Occurring Pyrimidines

et al. 1996

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Adsorption of the naturally occurring pyrimidine nucleobases and their corresponding nucleosides and nucleotides on compost-derived humic acid (HA) has been studied in aqueous solution. All these nine solutes interact with HA. Adsorption isotherms were measured at 19 solute concentrations from 12-600 µM and 6 temperatures in the range 10.0-40.0°C. Analysis with the Langmuir model indicates that adsorption occurs in three detectable steps A, B, and C, depending on the solute and the experimental conditions. Most of the data fit the Langmuir model, which generates a site capacity V i and an equilibrium constant K i for each detectable adsorption step. Site capacity and solute selectivity data indicate that the HA sites responsible for adsorption steps A, B, and C are chemically different and that pyrimidine solutes are adsorbed through their nucleobase units. Adsorption of pyrimidines on HA is exothermic, thermoneutral, or endothermic, depending on the solute and the adsorption step. Linear correlation of adsorption enthalpies and entropies points to similar surface interactions.

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Section: Resultssupporting

confidence: 59%

“…[19][20][21][22][23][24][25][26] Evidence that HA's in animals, 13,14 live plants, 12 and soils may have a limited number of building blocks 27 encourages further study.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 1. Naturally Occurring Pyrimidines

et al. 1996

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“…There is continuing, intense interest in how their structures and functions are related and how their properties, modification, and use can benefit agriculture and human health. 8 Secondly, we found that most of the pyrimidine adsorption data could be fitted to the Langmuir model, which generates an adsorption site capacity V i and an equilibrium constant K i (with associated thermodynamic parameters) for each of three adsorption steps A, B, and C. 1 This is significant because thermodynamic data for adsorption on HA are in short supply [9][10][11][12][13][14][15][16][17] and are needed to help us better understand HA properties and functions. 12 to at least 100 kDa) are versatile adsorbents that are insoluble in water below pH 8.…”

Section: Introductionmentioning

confidence: 99%

“…1 Firstly, we could sort the data into subsets that fit the Langmuir model or not. We have used the strategy of Part 1 1 to investigate the adsorption of adenine (10), 21 adenosine (11), adenosine 5′-monophosphate (12), guanosine (13), and guanosine 5′-monophosphate (14) on the same homogenized sample of compost-derived HA as in Part 1. 17,18 Thirdly, we could confirm that the K i 's are true adsorption equilibrium constants by obtaining linear plots of log K i Vs 1/T and calculating the enthalpies and entropies of adsorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 2. Naturally Occurring Purines

et al. 1996

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This paper describes adsorption of the aqueous purines adenine (10), adenosine (11), adenosine 5′monophosphate (12), guanosine (13), and guanosine 5′-monophosphate (14) on compost-derived humic acid (HA) over the solute concentration (12-1200 µM) and temperature (10.0-40.0°C) ranges used with pyrimidine solutes in Part 1. Nucleobase 10 and nucleosides 11 and 13 are neutral under the experimental conditions, while nucleotides 12 and 14 are monoanions. All the purines interact with HA, but only adenine causes HA dissolution at pH 5-6 and temperatures above 25.0°C, as found with cytosine and (-)nicotine. The IR spectrum of the soluble adenine-HA product indicates strong interaction with carboxylic and phenolic HA groups that is not due to simple proton transfer. Pyrimidines and purines are adsorbed in sequence on three HA sites A, B, and C. Most of the data fit the Langmuir model to generate site capacities V A , V B and V C and equilibrium constants K A , K B , and K C for each solute and site. Average site capacities increase 〈V A 〉 < 〈V B 〉 < 〈V C 〉, while equilibrium constants at 25.0°C decrease K A > K B > K C . Site capacities V i are independent of temperature and solute molar mass or charge, indicating adsorption through solute nucleobase units. Adenine has unusually high average 〈V A 〉 and 〈V B 〉 related to its ability to dissolve HA at pH 6, but 〈V C 〉 is unexceptional. The equilibrium constant data show that compost-derived HA sites have quite different solute selectivities. For example, site A discriminates poorly between the solutes thymine (4), thymidine (5), and 11 while site C has a strong preference for 4. These selectivities could influence animal, plant, soil, and sediment biochemistry. Linear correlation of the enthalpies and entropies for adsorption of every solute at each HA site points to a common underlying adsorption mechanism.

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ABSTRACTrepulsion effects, acifluorfen is sorbed by soil or soil constituents (Pusino et al, 1991;Ruggiero et al, 1992; Potential surface water and groundwater contaminants include her- Pusino et al, 1993; Gennari et al, 1994b; bicides that are applied postemergence. Although applied to the plant canopy, a portion of any application reaches the soil either directly 1995; Locke et al, 1997).

…”

mentioning

confidence: 99%

Acifluorfen Sorption, Degradation, and Mobility in a Mississippi Delta Soil

Gaston

Locke

2000

Soil Science Soc of Amer J

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ABSTRACTrepulsion effects, acifluorfen is sorbed by soil or soil constituents (Pusino et al., 1991;Ruggiero et al., 1992; Potential surface water and groundwater contaminants include her- Pusino et al., 1993; Gennari et al., 1994b; bicides that are applied postemergence. Although applied to the plant canopy, a portion of any application reaches the soil either directly 1995; Locke et al., 1997). Although the extent of sorpor via subsequent foliar washoff. This study examined sorption, degration in soil is generally proportional to OC content dation, and mobility of the postemergence herbicide acifluorfen (5-[2- (Gennari et al., 1994b; Nè gre et al., 1995 for increased acifluorfen sorption with decreasing soilAll tillage by depth combinations of soil exhibited a time-dependent approach to sorption equilibrium that was well described by a twopH or increasing cation exchange capacity (Pusino et site equilibrium-kinetic model. Acifluorfen degradation followed al., 1993; Gennari et al., 1994b; Locke et al., 1997).

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Adsorption of the herbicide acifluorfen on humic acids

Cited by 13 publications

References 7 publications

Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 1. Naturally Occurring Pyrimidines

Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 1. Naturally Occurring Pyrimidines

Adsorption of Aqueous Nucleobases, Nucleosides, and Nucleotides on Compost-Derived Humic Acid. 2. Naturally Occurring Purines

Acifluorfen Sorption, Degradation, and Mobility in a Mississippi Delta Soil

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