Combined experimental–theoretical investigation on the interactions of Diuron with a urea–formaldehyde matrix: implications for its use as an “intelligent pesticide”

González-Hurtado, Mayra; Rieumont-Briones, Jacques; Castro-González, Laura M.; Zumeta-Dubé, Inti; Galano, Annia

doi:10.1007/s11696-017-0245-1

Cited by 4 publications

(4 citation statements)

References 52 publications

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“…The reaction with paraformaldehyde (UF) resulted in a heterogeneous morphology (Fig. 1 b), with uneven surfaces covered by needle-shaped crystals, corresponding to the urea–formaldehyde fraction 22 , 23 . A new morphology is seen for the composites UFZO 0.5, 1, and 2 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The UF profile shows that the endothermic peak in DSC from 115 to 122 °C corresponds to a degradation mechanism, thus confirming the correlation to bridge breaking in oligomeric fractions. The next three stages (centered at 235, 287, and 330 °C) are probably related to the loss of functional groups of different chemical natures and energy costs 23 . UFZO composites behave very closely to pure UF; however, in the 2nd degradation stage it shifts to lower temperatures, suggesting the breakdown of the H-bonds.…”

Section: Resultsmentioning

confidence: 99%

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Different Zn loading in Urea–Formaldehyde influences the N controlled release by structure modification

Giroto

Valle

Guimarães

et al. 2021

Sci Rep

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Nitrogen fertilization has been a critical factor for high crop productivity, where urea is currently the most used N source due to its high concentration and affordability. Nevertheless, urea fast solubilization leads to frequent losses and lower agronomic efficiency. The modification of urea structure by condensation with formaldehyde has been proposed to improve nutrient uptake by plants and to reduce environmental losses. Herein we show that the co-formulation with Zn strongly modifies the N release (in lab conditions) and, more important, the Zn source—ZnSO4 or ZnO—has a critical role. Urea–formaldehyde (UF) served as a matrix for the zinc sources, and chemical characterizations revealed that Zn particles influenced the length of the polymeric chain formation. Release tests in an aqueous medium showed that the UF matrix favors ZnO release and, on the other hand, delays ZnSO4 delivery. Soil incubation with the fertilizer composites proved the slow-release of N from UF, is ideal for optimizing nutritional efficiency. Our results indicated that the ZnO-UF system has beneficial effects for both nutrients, i.e., reduces N volatilization and increases Zn release.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Different Zn loading in Urea–Formaldehyde influences the N controlled release by structure modification

Giroto

Valle

Guimarães

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The reaction with paraformaldehyde (UF) resulted in a heterogeneous morphology (Fig. 1 b), with uneven surfaces covered by needle-shaped crystals, corresponding to the ureaformaldehyde fraction 22,23 . A new morphology is seen for the composites UFZO 0.5, 1, and 2 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The UF pro le shows that the endothermic peak in DSC from 115 to 122 o C corresponds to a degradation mechanism, thus con rming the correlation to bridge breaking in oligomeric fractions. The next three stages (centered at 235, 287, and 330 ºC) are probably related to the loss of functional groups of different chemical natures and energy costs 23 . UFZO composites behave very closely to pure UF; however, in the 2nd degradation stage it shifts to lower temperatures, suggesting the breakdown of the Hbonds.…”

Section: Resultsmentioning

confidence: 99%

Different Zn Loading in Urea-Formaldehyde Influences the N Controlled Release by Structure Modification

Giroto

Valle

Guimarães

et al. 2021

Preprint

View full text Add to dashboard Cite

Nitrogen fertilization has been a critical factor for high crop productivity, where urea is currently the most used N source due to its high concentration and affordability. Nevertheless, urea fast solubilization leads to frequent losses and lower agronomic efficiency. The modification of urea structure by condensation with formaldehyde has been proposed to improve nutrient uptake by plants and to reduce environmental losses. Herein we show that the co-formulation with Zn strongly modifies the N release (in lab conditions) and, more important, the Zn source – ZnSO4 or ZnO – has a critical role. Urea-formaldehyde (UF) served as a matrix for the zinc sources, whose chemical characterizations revealed that Zn particles influenced the length of the polymeric chains' formation. Release tests in an aqueous medium showed that the UF matrix favors ZnO release and, on the other hand, delays ZnSO4 delivery. Soil incubation with the fertilizer composites proved the slow-release of N from UF, ideal for optimizing nutritional efficiency. Our results indicated that ZnO: UF system has beneficial effects for both nutrients, i.e., reduces N volatilization and increases Zn release.

show abstract

Microencapsulated diuron herbicide: kinetic study of its release from a urea–formaldehyde matrix

et al. 2022

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Combined experimental–theoretical investigation on the interactions of Diuron with a urea–formaldehyde matrix: implications for its use as an “intelligent pesticide”

Cited by 4 publications

References 52 publications

Different Zn loading in Urea–Formaldehyde influences the N controlled release by structure modification

Different Zn loading in Urea–Formaldehyde influences the N controlled release by structure modification

Different Zn Loading in Urea-Formaldehyde Influences the N Controlled Release by Structure Modification

Microencapsulated diuron herbicide: kinetic study of its release from a urea–formaldehyde matrix

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