Thermal decomposition of ethyl and methyl parathion

Germain, Albert; Bizzarri, Didier; Dodet, Claude

doi:10.1016/s0950-4230(99)00067-4

Cited by 6 publications

(3 citation statements)

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“…ADT24 is the temperature, at which a given system undergoes thermal explosion after 24 h [11,12] under adiabatic conditions. The following equation describing the time to explosion (t ex ) parameter may be derived on the basis of this theory:…”

Section: Maximum Safe Temperature Of Technological Processes Performancementioning

confidence: 99%

“…Therefore, to estimate the risk of uncontrolled exothermic decomposition it is more appropriate to use kinetic parameters derived from DSC measurements rather than manometric ones. Data obtained from DSC measurements allow the determination of the maximum safe operating temperature of TMS and adiabatic decomposition temperature for a 24-h induction time ADT24 [11][12][13][14], self-accelerating decomposition temperature (SADT) [13][14][15][16][17][18][19][20]. SADT is the lowest ambient temperature at which the stored substance in a particular commercial packaging will self-heat and the temperature increase will be at least 6 K in 7 days or less.…”

Section: Introductionmentioning

confidence: 99%

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Origin of PYX thermal stability investigation with calorimetric and spectroscopic methods

Gołofit

Szala

2017

J Therm Anal Calorim

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2,6-Bis(picrylamino)-3,5-dinitropyridine (PYX) is a highly thermostable explosive. The examination of its thermal decomposition was conducted, and kinetic parameters of the decomposition reaction were determined. Their values for the initial conversion degree (a = 0.02) and hermetic conditions are a E a = 261 ± 11 kJ mol -1 , logA = 18.09. Volatile semi-products are formed during PYX thermal decomposition, which influence kinetic parameters of the decomposition reaction. That is why hermetic pans should be used for this analysis. The maximum safe temperature, i.e., T = 246°C, was calculated on the basis of ADT24 method. Analysis of results obtained during spectroscopic analysis of PYX indicates that there are three main reasons of the compound stability. Strong hydrogen bonds between oxygen atoms in nitro groups and aromatic C-H and N-H protons are confirmed by analysis of IR and 1 H NMR spectra. Large couplings in PYX carbon skeleton which stabilize the molecule are detected on the basis of FWHM of 13 C NMR peaks. The stability of the analyzed compound is enhanced by the lack of carbon with sp 3 hybridization.

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Section: Maximum Safe Temperature Of Technological Processes Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Origin of PYX thermal stability investigation with calorimetric and spectroscopic methods

Gołofit

Szala

2017

J Therm Anal Calorim

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“…Parathion represents the number one cause of occupational and accidental intoxication and fatalities among the pesticides in developing countries (FAO, 2003). In the treatment of parathion, biological and physical processes, such as wetland and thermal decomposition, have some limitations in terms of time and energy consumption (Schulz et al, 2003;Germain et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Parathion degradation and toxicity reduction in solar photocatalysis and photolysis

Zoh

Kim²,

Kim³

et al. 2006

Water Science and Technology

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The solar photocatalytic degradation of methyl parathion was investigated using a circulating TiO2/solar light reactor. Under solar photocatalysis condition, parathion was more effectively degraded than solar photolysis and TiO2-only conditions. With solar photocatalysis, 20 mg/L of parathion was completely degraded within 60 min with a TOC decrease of 63% after 150 min. The main ionic byproducts during photocatalysis recovered from parathion degradation were mainly as NO3-, NO2- and NH4+, 80% of the sulphur as SO4(2-), and 5% of phosphorus as PO4(3-). The organic intermediates 4-nitrophenol and methyl paraoxon were also identified, and these were further degraded in solar photocatalytic condition. Two different bioassays (Vibrio fischeri and Daphnia magna) were used to test the acute toxicity of solutions treated by solar photocatalysis and photolysis. The Microtox test using V. fischeri showed that the toxicity expressed as EC50 (%) value increased from 5.5% to >82% in solar photocatalysis, indicating that the treated solution is non-toxic, but only increased from 4.9 to 20.5% after 150 min in solar photolysis. The acute toxicity test using D. magna showed that EC50 (%) increased from 0.05 to 1.08% under solar photocatalysis, but only increased to 0.12% after 150 min with solar photolysis, indicating the solution is still toxic. The pattern of toxicity reduction parallels the decrease in TOC and the parathion concentrations.

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Degradation mechanism and the toxicity assessment in TiO2 photocatalysis and photolysis of parathion

Kim

Choi

et al. 2006

Chemosphere

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Thermal decomposition of ethyl and methyl parathion

Cited by 6 publications

References 1 publication

Origin of PYX thermal stability investigation with calorimetric and spectroscopic methods

Origin of PYX thermal stability investigation with calorimetric and spectroscopic methods

Parathion degradation and toxicity reduction in solar photocatalysis and photolysis

Degradation mechanism and the toxicity assessment in TiO2 photocatalysis and photolysis of parathion

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