Atrazine-Soil Organic Matter Interactions

Dunigan, Edward P.; McIntosh, Thomas

doi:10.1017/s004317450004889x

Cited by 49 publications

(13 citation statements)

References 9 publications

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“…The present results are at odds with previous findings which suggested that the incorporation of organic amendments in soil increased TA persistence by increasing adsorption 27, 33. However, the nature of the organic amendment has a crucial effect on pesticide adsorption and persistence 34…”

Section: Resultscontrasting

confidence: 99%

Degradation and adsorption of terbuthylazine and chlorpyrifos in biobed biomixtures from composted cotton crop residues

Kravvariti

Tsiropoulos

Karpouzas

2010

Pest Management Science

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Compost had a dual but contrasting effect on degradation that depended on the chemical nature of the pesticide studied: a positive effect towards TA owing to increasing biodegradation and a negative effect towards CP owing to increasing adsorption. Overall, composted cotton crop residues could be potentially used in local biobed systems in Greece, as they promoted the degradation of hydrophilic pesticides and the adsorption of hydrophobic pesticides.

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Section: Resultscontrasting

confidence: 99%

Degradation and adsorption of terbuthylazine and chlorpyrifos in biobed biomixtures from composted cotton crop residues

Kravvariti

Tsiropoulos

Karpouzas

2010

Pest Management Science

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“…Previous studies showed that properties of organic amendments are an important factor in affecting pesticide sorption in amended soils (Dunigan and MacIntosh 1971;Dolaptsoglou et al 2007;Luo et al 2009). Biochar is also known as black carbon that is derived from biomass.…”

Section: Treatmentmentioning

confidence: 99%

Sorption of the herbicide terbuthylazine in two New Zealand forest soils amended with biosolids and biochars

et al. 2009

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Background, aim, and scope Terbuthylazine is one of the most commonly used herbicides for vegetation management in forest plantations in New Zealand. Knowledge about the sorption of terbuthylazine on forest soils, especially the influence of coexisting organic amendments, remains obscure. In this study, we evaluated the effects of biosolids and biochars on the sorption of terbuthylazine to forest soils. Materials and methods Two pumice soils, including a forest landing site soil with low soil organic matter content and an organic carbon rich topsoil under standard forest management, were sampled from a 2-year-old replanted pine plantation. The soils were mixed with four organic amendments, including two thermally dried biosolids with one digested and the other undigested, a biochar produced from high temperature pyrolysis (700°C), and a biochar from pyrolysis with a lower temperature (approximately 350°C). A batch equilibration method was used to determine terbuthylazine adsorption-desorption in organic amendment-treated and untreated soils. Adsorption and desorption isotherms were described with the Freundlich equation.Results and discussion Adsorption and desorption isotherms in the soils with or without organic amendments were well described by the Freundlich model. The undigested or digested biosolids added to the topsoil had a negligible or limited effect on the adsorption to terbuthylazine. The addition of the other amendments to the two soils all enhanced the adsorption. The biochars displayed higher efficiency in improving soils' adsorption capacity to terbuthylazine than the biosolids. Among the organic amendments evaluated, the biochar obtained from high temperature pyrolysis demonstrated the most significant enhancement on adsorption with an enhancing factor of 63; whereas, the digested biosolids showed the weakest enhancement. Furthermore, terbuthylazine adsorbed by the digested biosolids appeared to be more easily desorbed than that by biochar treatments. Conclusions This work indicates that the addition of organic amendments to forest soils, particularly biochar to a soil with low native organic matter, may enhance soil sorption of terbuthylazine and thus reduce the possibility of the hydrophobic herbicide leaching to groundwater.

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“…The adsorption of atrazine and alachlor on both organic and inorganic soil constituents has been widely studied [7,8] and is well correlated with organic matter and clay content. Soil pH, temperature, moisture content, exchangeable cations, and electrolyte concentration also affect the adsorption and deg-* To whom correspondence may be addressed (jstucki@uiuc.edu).…”

Section: Introductionmentioning

confidence: 99%

Fate of Atrazine and Alachlor in Redox-Treated Ferruginous Smectite

Stucki

et al. 2001

Environ Toxicol Chem

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The oxidation state of structural iron (Fe) in clay minerals exerts a large influence on clay surface chemistry and may affect the adsorption and degradation of pesticides in the environment. This effect, however, has been little investigated. In the present study, herbicides atrazine and alachlor were reacted with ferruginous smectite (sample SWa-1) in its oxidized, reduced (either chemically or bacterially), and reduced-reoxidized states. In some experiments the herbicide was labeled with 14C. Gas chromatography/mass spectrometry (GC-MS) was also used to detect alachlor degradation products. Compared to oxidized clays, reduction by both chemical and microbial treatments decreased the concentration of both herbicides in the surrounding solution. Reoxidized clay exhibited behavior similar to the oxidized clay. Hydrolysis-dechlorination of atrazine occurred in the presence of chemically reduced SWa-1, and GC-MS analysis of alachlor revealed at least 14 degradation products after treatment with reduced clay and only two with the oxidized clay. Interaction of atrazine and alachlor with the clay may be through a H bond with the waters of hydration surrounding interlayer cations, the extent of which should increase with increasing acidity; but under reduced conditions, the validity of this model is unclear. Reduction of structural Fe may affect pH-dependent phenomena in two ways: The increased surface charge density increases the number of hydrated interlayer cations, thereby enhancing surface acidity, and increased electron density at basal surface oxygens increases their Brønsted basicity. Atrazine could, therefore, adsorb and/or degrade through either acid or alkaline hydrolysis pathways. Increased reduction potential of the reduced clay surfaces may also promote degradation.

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Atrazine-Soil Organic Matter Interactions

Cited by 49 publications

References 9 publications

Degradation and adsorption of terbuthylazine and chlorpyrifos in biobed biomixtures from composted cotton crop residues

Degradation and adsorption of terbuthylazine and chlorpyrifos in biobed biomixtures from composted cotton crop residues

Sorption of the herbicide terbuthylazine in two New Zealand forest soils amended with biosolids and biochars

Fate of Atrazine and Alachlor in Redox-Treated Ferruginous Smectite

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