Adsorption, desorption and persistence of fomesafen in soil

Li, Xiao; Grey, Timothy L.; Price, Katilyn; Vencill, William K.; Webster, Theodore M.

doi:10.1002/ps.5112

Cited by 19 publications

(19 citation statements)

References 29 publications

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“…This relationship with OM may be due to the presence of microbial populations associated with the OM and not due to sorption, as previously discussed. Dissipation through leaching may have been reduced due to the increased OM content …”

Section: Resultsmentioning

confidence: 89%

Dissipation of fomesafen in fumigated, anaerobic soil disinfestation‐treated, and organic‐amended soil in Florida tomato production systems

Gioia

Hwang

et al. 2019

Pest Management Science

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BACKGROUND: Fumigated, anaerobic soil disinfestation-treated (ASD), and organic-amended soil management strategies have been investigated as potential methyl bromide (MBr) alternatives for controlling diseases, nematodes, and weeds in soil. Nutsedge and broadleaf weed control using fomesafen has been reported to be comparable to MBr in normal cropping systems. There is no information on the fate of fomesafen used in combination with alternative practices. In this study, the fate of fomesafen in these alternative systems was measured by liquid chromatography-tandem mass spectrometry (LC/MS-MS) following extraction using a modified Quick Easy Cheap Effective Safe (QuEChERS) method. RESULTS:The reported half-life (DT 50 ) values for fomesafen in the top 15 cm of soil were from 62.9 to 107.3 days. The DT 50 values in organic-amended soil were higher than in ASD-treated soil in the top 15 cm. For all treatments, reductions in concentrations were positively correlated with lower redox potentials and organic matter content. Some leaching of fomesafen into the 16-30 cm zone was observed in all treatments. CONCLUSIONS:The DT 50 values in this study were generally higher than those reported in previous studies performed at different locations. Due to increased losses of the herbicide and subsequent reduction in weed control, fomesafen is likely not to be suitable for effective weed control in systems using ASD techniques employing composted poultry litter and molasses. Integration of fomesafen using composted yard waste 1 (CYW1) and Soil Symphony Amendment (SSA) may result in acceptable weed control. Given that the soil was very sandy and the pH was higher than the pKa, fomesafen might leach deeper than 30 cm, particularly with the use of chemical soil fumigants (CSFs).

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Section: Resultsmentioning

confidence: 89%

Dissipation of fomesafen in fumigated, anaerobic soil disinfestation‐treated, and organic‐amended soil in Florida tomato production systems

Gioia

Hwang

et al. 2019

Pest Management Science

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“…The DT 50 of dimethachlor is high (see Table ), from 50 to 70 days for all conditions, so this compound would have a medium‐high persistence. These results are similar to those obtained for TCP (transformation product of chlorpyriphos) in soils (DT 50 17–52 days), and other pesticides like thiamethoxan (DT 50 34–60 days) o fomesafen (DT 50 34–48 days), which have similar DT 50 values in soils. In addition, the results were compared with those obtained for two herbicides belonging to the same family, as metazachlor and prochloraz.…”

Section: Resultsmentioning

confidence: 99%

Degradation studies of dimethachlor in soils and water by UHPLC‐HRMS: putative elucidation of unknown metabolites

López‐Ruiz

Romero‐González

Ortega‐Carrasco

et al. 2019

Pest Management Science

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BACKGROUND: The analytical control of the presence of dimethachlor and its metabolites in environmental samples, such as water and soils, is a main concern. Degradation of this pesticide has been evaluated in two types of soils and two different water conditions at two concentration levels. For that purpose, a new liquid chromatography-mass spectrometry method has been developed and putative identification of new metabolites has been performed. RESULTS: An analytical method based on ultra-high-performance liquid chromatography coupled to Orbitrap mass spectrometry (UHPLC-Orbitrap-MS) was developed to monitor the degradation of dimethachlor in environmental samples (water and soils). The degradation of dimethachlor in soils and groundwater samples has been monitored from 1 to 110 days after application of a plant protection product at two doses. Concentration of the parent compound slowly decreased in both matrices. DT 50 values ranged from 40 to 70 days. Some metabolites were detected in the commercial product and in the samples one day after the application of the plant protection product. In addition, three new metabolites were putatively identified during dimethachlor degradation by untargeted analysis. CONCLUSION: In this study, the degradation of dimethachlor into its metabolites has been studied in soils and water, using a UHPLC-Orbitrap-MS validated method. A putative elucidation of new metabolites of dimethachlor has been carried out applying HRMS and software tools. Degradation results allowed for understanding the behavior of dimethachlor in soils and water, and provided information regarding the possible risk of this pesticide and its metabolites to the ecosystem.

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“…, carboxyl and guanidyl) favor the other interactions such as electrostatic forces, H-bonding, and cation bridging. − There are two opposite impacts of OM on MC adsorption, that is, direct site competition and/or pore blockage and coadsorption . Presumably, if the hydrophobic interaction was a dominant mechanism accounting for the adsorption of molecules to soil, the organic carbon-normalized sorption coefficient of this molecule ( K OC ; more details are available in SI-1) would be relatively constant across a range of soils . However, this is not the case for MC adsorption on the soils evaluated in this study.…”

Section: Discussionmentioning

confidence: 99%

Variant-Specific Adsorption, Desorption, and Dissipation of Microcystin Toxins in Surface Soil

Liu

et al. 2021

J. Agric. Food Chem.

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Microcystins (MCs) are hepatotoxic heptapeptides identified in cyanobacterial bloom-impacted waters and soils. However, their environmental fate in soils is poorly understood, preventing reliable site assessment. This study aims to clarify the variant-specific adsorption, desorption, and dissipation of MC-LR and MC-RR in agricultural soils. Results revealed that their adsorption isotherms followed the Freundlich model (R 2 ≥ 0.96), exhibiting a higher nonlinear trend and lower adsorption capacity for MC-LR than for MC-RR. The soils had low desorption rates of 8.14−21.06% and 3.06−34.04%, respectively, following a 24 h desorption cycle. Pairwise comparison indicated that soil pH and clay played key roles in MC-LR adsorption and desorption, while organic matter and cation exchange capacity played key roles in those of MC-RR. MC-LR dissipation half-lives in soils were 27.18− 42.52 days, compared with 35.19−43.87 days for MC-RR. Specifically, an appreciable decrease in MC concentration in sterile soils suggested the significant role of abiotic degradation. This study demonstrates that the minor structural changes in MCs might have major effects on their environmental fates in agricultural soil and indicates that the toxic effects of MCs should be of high concern due to high adsorption, low desorption, and slow dissipation.

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Adsorption, desorption and persistence of fomesafen in soil

Cited by 19 publications

References 29 publications

Dissipation of fomesafen in fumigated, anaerobic soil disinfestation‐treated, and organic‐amended soil in Florida tomato production systems

Dissipation of fomesafen in fumigated, anaerobic soil disinfestation‐treated, and organic‐amended soil in Florida tomato production systems

Degradation studies of dimethachlor in soils and water by UHPLC‐HRMS: putative elucidation of unknown metabolites

Variant-Specific Adsorption, Desorption, and Dissipation of Microcystin Toxins in Surface Soil

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