Thermal decomposition and stability of quinoline compounds using thermogravimetry and differential scanning calorimetry

Lizarraga, Elena; Zabaleta, C.; Palop, Juan Antonio

doi:10.1016/j.tca.2004.09.008

Cited by 12 publications

(2 citation statements)

References 5 publications

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“…The results are consistent with those of Pinna and Pusino (2012) who found that the reduced reactivity of quinclorac relative to quinmerac was caused by the electron withdrawing action of two chlorine atoms. As well, Lizarraga et al (2005) indicated the strong electron-withdrawing groups in position 6 of the quinoline ring made the molecule more stable to counter the electron-withdrawing effect that the electronic delocalization within the π-orbitals of the aromatic ring. This provided for an extra intermolecular interaction resulting in an improvement of physical stability with aromaticity.…”

Section: Discussionmentioning

confidence: 96%

A study of quinclorac degradation during thermal and forced hydrolysis and soil photolysis

El-Dars,

Mansour,

Radwan

2023

Egypt.J. Soil Sci.

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N THE PRESENT study, the stability of quinclorac as (Queen 75% WG) during the forced thermal degradation at temperatures, forced acidic and alkaline hydrolysis, and soil photolysis was investigated. The results indicate that the maximum active ingredient degradation of quinclorac (5.57%) was achieved during storage at 54°C after 14 weeks. During the same time period, however, the reduction was modest, ranging between 1.5-3% at 35, 40, and 45°C, respectively. The shelf life of quinclorac after storage at different temperatures was consistent with the time period recommended by FAO/WHO. The acidic hydrolysis of quinclorac improved the shelf-life and half-life to 5.40 and 72.96 days, respectively, which is almost four times that of 1.0 N HCl. However, in alkaline conditions, the shelf-life and half-life of quinclorac were lowered to 1.02 and 13.73 days, respectively. Increasing the alkaline concentration to 1.0 N NaOH further reduced these results to 0.44 and 5.95 days, respectively. Generally, the kinetics of quinclorac degradation followed a first-order model that was reliant on its initial concentration. Furthermore, the half-life of quinclorac dissipation was determined to be 124 days in local clay-loam soil (with organic matter of 1.92%) and a significant saturation percentage of 62.99% and hence it is considered a persistent herbicide. The degradation products of quinclorac were identified by GC/MS and may be attributed to decarboxylation, dechlorination, hydroxylation, and the substitution of chlorine with a hydroxyl group.

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Section: Discussionmentioning

confidence: 96%

A study of quinclorac degradation during thermal and forced hydrolysis and soil photolysis

El-Dars,

Mansour,

Radwan

2023

Egypt.J. Soil Sci.

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“…Sample amount was 7.74 mg. DSC analysis was conducted on a NETZSCH DSC 200 PC (NETZSCH Corporation, Germany), temperature was programmed from 50 to 600 8C with a heating rate of 10 8C/min in N 2 . Sample amount was 8.60 mg [10].…”

Section: Thermo-analysis Of Tga/sdta and Dscmentioning

confidence: 99%

Thermal decomposition study of menthyl-glycoside by TGA/SDTA, DSC and simultaneous Py-GC–MS analysis

Xie

Tang

et al. 2007

Journal of Analytical and Applied Pyrolysis

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Occurrence of Quinoline in the Environment and Its Advanced Treatment Technologies

Chawley

Suman

Jagadevan

2023

Energy, Environment, and Sustainability

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Thermal decomposition and stability of quinoline compounds using thermogravimetry and differential scanning calorimetry

Cited by 12 publications

References 5 publications

A study of quinclorac degradation during thermal and forced hydrolysis and soil photolysis

A study of quinclorac degradation during thermal and forced hydrolysis and soil photolysis

Thermal decomposition study of menthyl-glycoside by TGA/SDTA, DSC and simultaneous Py-GC–MS analysis

Occurrence of Quinoline in the Environment and Its Advanced Treatment Technologies

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