Mechanism of thermal decomposition of a pesticide for safety concerns: Case of Mancozeb

Thermal decomposition under both air and inert atmospheres of a commercial Mancozeb product was investigated through thermogravimetric analysis and laboratory scale thermal treatment from 20°C to 950°C, with analysis of gaseous and solid products. The aim of this study is the understanding of the th...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-12, Vol.184 (1-3), p.6-15
Main Authors: Giroud, N., Dorge, S., Trouvé, G.
Format: Article
Language:English
Subjects:
Air pollution
Applied sciences
Atmospheric pollution
Carbon
Chemical and Process Engineering
Chemical engineering
Dithiocarbamate pesticides
Engineering Sciences
Exact sciences and technology
Fire incidents
Gaseous and solid pollutants
Hot Temperature
Mancozeb
Maneb - adverse effects
Maneb - chemistry
Microscopy, Electron, Transmission
Pesticides
Pesticides - adverse effects
Pesticides - chemistry
Pollution
Reactors
Recovery
Safety
Sulfur
Sulphur
Thermal decomposition
Thermal degradation
Thermogravimetry
Zinc sulfides
Zineb - adverse effects
Zineb - chemistry
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Summary:Thermal decomposition under both air and inert atmospheres of a commercial Mancozeb product was investigated through thermogravimetric analysis and laboratory scale thermal treatment from 20°C to 950°C, with analysis of gaseous and solid products. The aim of this study is the understanding of the thermal degradation mechanisms of a pesticide under different atmospheres and the chemical identification of the solid and gaseous pollutants which can be emitted during warehouse fires and which can constitute a threat for health and environment. Pyrolysis of Mancozeb takes place between 20°C and 950°C and lead essentially to CS2 and H2S emissions with formation at 950°C of MnS and ZnS. Thermal oxidation of Mancozeb under air occurs between 150°C and 950°C with formation of CO, CO2 and sulphur gases (CS2 and SO2). The first step (155–226°C) is the loss of CS2 and the formation of ethylene thiourea, ZnS and MnS. The metallic sulphides are oxidized in ZnO and MnSO4 between 226°C and 650°C (steps 2 and 3). MnSO4 is then oxidized in Mn3O4 during the last step (step 4) between 650°C and 950°C. At 950°C, carbon recovery is close to 95%. Sulphur recovery is close to 98% with an equal partition between SO2 and CS2.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.07.053