Effect of Different Inorganic and Organic Compounds on Sorption of 2,4-D and Atrazine

Alam, Jahrul M; Dikshit, Anil Kumar; Bandyophadyay, M.

doi:10.1081/pfc-120015438

Cited by 11 publications

(11 citation statements)

References 32 publications

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“…Both the positive relation of SOC and negative relation of soil pH with 2,4‐D sorption have been demonstrated previously for laboratory and field measurements (Bekbölet et al, 1999; Farenhorst et al, 2001; Alam et al, 2002; Spadotto and Hornsby, 2003). The soils in Alberta generally demonstrated larger Kd values than those previously documented for 2,4‐D in agricultural soils (Mallawatantri and Mulla, 1992; Bekbölet et al, 1999; Farenhorst et al, 2001; Gaultier et al, 2006), with the exception of soils from the MG ecoregion that had low sorption capacity.…”

Section: Discussionsupporting

confidence: 72%

Regional Assessment of Herbicide Sorption and Degradation in Two Sampling Years

Gaultier

Farenhorst

Cathcart³

et al. 2008

J of Env Quality

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Sorption and degradation of the herbicide 2,4-D [2,4-dichlorophenoxyacetic acid] were determined for 123 surface soils (0 to 15 cm) collected in 2002 and in 2004 between 49 degrees to 60 degrees north longitude and 110 degrees to 120 degrees west latitude in Alberta, Canada. The soils were characterized by soil organic carbon content (SOC), pH, electrical conductivity, soil texture, cation exchange capacity, carbonate content, and total soil microbial activity. The 2,4-D sorption coefficients, Kd and Koc, were highly variable with coefficients of variation of 89 and 59%, respectively, at the provincial scale. Both Kd and Koc were well described by regression models with SOC and soil pH as variables, regardless of scale. Surprisingly, variations in 2,4-D mineralization were much smaller than variations in sorption. Variability in total 2,4-D mineralization was particularly low, with a coefficient of variation of only 7% at the provincial scale. Average 2,4-D half-lives in ecoregions ranged from 1.7 to 3.5 d, much lower than the field dissipation half-life of 10 d reported for 2,4-D in general pesticide property databases. Regression models describing degradation parameters were generally poor or not significant because 2,4-D mineralization was only weakly associated with measured 2,4-D sorption parameters and soil properties. As such, regional variations in herbicide sorption coefficients should be measured or calculated based on soil properties, to assign distinct pesticide fate model input parameters when estimating 2,4-D off-site transport at the provincial scale. Spatial variations in herbicide degradation appear less important for Alberta as 2,4-D half-lives were similar in soils across the province. The rapid mineralization of 2,4-D is noteworthy because 2,4-D is widely used in Alberta and perhaps adaptation of soil microbial communities allowed for accelerated degradation regardless of soil properties or the extent of 2,4-D sorption by soil.

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Section: Discussionsupporting

confidence: 72%

Regional Assessment of Herbicide Sorption and Degradation in Two Sampling Years

Gaultier

Farenhorst

Cathcart³

et al. 2008

J of Env Quality

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“…Standard methods [15] were adopted for the analysis of various water quality parameters. Gas Chromatograph (GC; GC-14A, Shimadzu, Japan) was used for the measurement of both 2,4-D and atrazine.…”

Section: Methodsmentioning

confidence: 99%

“…For example, about 12 million gallon of 2,4-D and 2,4,5-T, which contained toxic dioxin, were used over 4.5 million acre of land during Vietnam War from 1962 to 1971. [11] In earlier articles, [12,13] authors used rubber granules for removal of 2,4-D and atrazine from water environment, while the study outlined in another article [15] tried to quantify the impacts of commonly occurring inorganic and organic constituents in natural water on the sorption efficiency of rubber granules. In the present article, an attempt has been made to provide some information about the kinetic and equilibrium process that regulate the retention by the rubber granules of 2,4-D and atrazine from an aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Sorption of 2,4‐D and Atrazine on Rubber Granules

Alam

Dikshit

Bandyopadhyay

2007

Journal of Dispersion Science and Technology

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For the removal of 2,4-D (2,4-dichloro-phenoxy-acetic acid) and atrazine (2-chloro-4-ethyalamino-6-isopropylamino-s-traiazine) from water environment, batch studies were performed to study the kinetics of 2,4-D and atrazine sorption by rubber granules. Experiments were conducted at various initial concentrations of 7.5 mg/L, 4 mg/L, and 0.5 mg/L of 2,4-D and atrazine with 18 g/L sorbent dose. The equilibrium time was found to be 120 minutes for both 2,4-D and atrazine. The regression analysis for the experimental data showed that the rapid stage zone of kinetics profiles followed a first order reversible kinetics for all initial concentrations of sorbate. The various thermodynamic properties such as enthalpy and entropy activation values (DH and DS) also show that the sorption is spontaneous. This article will provide information toward understanding the sorption phenomena of 2, 4-D and atrazine on waste tyre rubber granules. It also is valuable to us in finding out the rate constant of sorption of 2,4-D and atrazine.

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“…In previous studies, when compared with other lowcost adsorbents, GTR was among those with the best solute removal efficiencies (Alam et al 2000;Purakayastha et al 2003;Hatzinger et al 2004). Some of the organic compounds tested for adsorption by GTR have been anionic surfactants (Purakayastha et al 2005a, b), herbicides (2,4-D and atrazine; Alam et al 2000Alam et al , 2002Alam et al , 2005, and different alkanes and solvents (Rangarajan et al 1999). Removal of cadmium (III) from aqueous solution has also been achieved with GTR, and it was shown that the use of ultrasound increased the adsorption capacity (Entezari et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Treatment of Waters Containing the Thiocarbamate Herbicide Molinate through an Adsorption/Bio-Regeneration System using a Low-Cost Adsorbent

Carvalho

Mendes

Magalhães

et al. 2009

Water Air Soil Pollut

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The feasibility of using recycled granular tire rubber (GTR) to remove molinate from contaminated water bodies was evaluated in this study. Adsorption equilibrium data was well described by a linear isotherm, and the adsorption was completely reversible. Breakthrough curves showed column efficiencies of approximately 40%, based on total capacity, and complete bed regeneration was achieved using clean water. The effluent from the regeneration step was successfully decontaminated using a defined bacterial mixed culture, capable of molinate mineralization. It was shown that this treated water can be used for regenerating a subsequently saturated bed. The GTR adsorbent showed two important features: complete reversibility towards molinate adsorption and stability along successive adsorption/bio-regeneration cycles. Common adsorbents, such as activated carbons and resins, loose performance very quickly under the same conditions, due to irreversible adsorption. Abbreviations and NotationsConcentration of molinate in the column inlet stream (mg dm −3 ) C eq Molinate concentration in the liquid phase, in equilibrium with a concentration q eq of molinate in the adsorbed phase (mg g −1 ) L bBed length (cm) m ads Mass of adsorbent in the bed (g) Q Flow rate (cm 3 s −1 ) q Molinate adsorbed concentration (mg g −1 ) q 0 Molinate adsorbed concentration, in equilibrium with a concentration C 0 of molinate in the liquid phase (mg g −1 ) q bt Bed capacity at breakthrough (mg g −1 ) q bed Total bed capacity based on breakthrough data (mg g −1 ) q eq Molinate adsorbed concentration, in equilibrium with a concentration C eq of molinate in the liquid phase (mg g −1 ) q isot Total bed capacity based on adsorption equilibrium data (mg g −1 ) S Column cross-section (cm 2 ) t Time (s) t bt Breakthrough time (h) Water Air Soil Pollut (

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Effect of Different Inorganic and Organic Compounds on Sorption of 2,4-D and Atrazine

Cited by 11 publications

References 32 publications

Regional Assessment of Herbicide Sorption and Degradation in Two Sampling Years

Regional Assessment of Herbicide Sorption and Degradation in Two Sampling Years

Kinetic Study of Sorption of 2,4‐D and Atrazine on Rubber Granules

Treatment of Waters Containing the Thiocarbamate Herbicide Molinate through an Adsorption/Bio-Regeneration System using a Low-Cost Adsorbent

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