Abstract:
In this paper, the effects of heattreatmenton the properties of isomers of hexachlorocyclohexane (Reference Material) and the technical grade-HCH were investigated. Thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) results indicated that heating causes melting of the samples followed by evaporation of the MR isomers. The same thermal process was observed for technical grade-HCH, but with an intermediate melting and evaporation temperature for the isomers present in the HCH matrix. By the other side, the investigation of technical grade-HCH in a closed system (reactor) shows that concentration of the insecticide isomers present in the technical grade-HCH is temperature and time dependent but the evolved gases are more toxic and must be previously treated before released in the atmosphere.
Reference:
PASTRE, I.A.; ARAÚJO, Marcela Maciel de; OLIVEIRA, Alex de Oliveira e; IGNATIUS, Scandar Gasperazzo; FERTONANI, F.L . Investigation of thermal desorption of HCH: temperature and time effects. In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMÉTRICA, 9., 2014, Serra Negra. Anais… Rio de Janeiro: ABRATEC, 2014. 5 p.
Document with restricted access. Log in to BiblioInfo, Library – DAIT/IPT to access the PDF text:
http://escriba.ipt.br/pdf_restrito/173113.pdf
In this paper, the effects of heattreatmenton the properties of isomers of hexachlorocyclohexane (Reference Material) and the technical grade-HCH were investigated. Thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) results indicated that heating causes melting of the samples followed by evaporation of the MR isomers. The same thermal process was observed for technical grade-HCH, but with an intermediate melting and evaporation temperature for the isomers present in the HCH matrix. By the other side, the investigation of technical grade-HCH in a closed system (reactor) shows that concentration of the insecticide isomers present in the technical grade-HCH is temperature and time dependent but the evolved gases are more toxic and must be previously treated before released in the atmosphere.
Reference:
PASTRE, I.A.; ARAÚJO, Marcela Maciel de; OLIVEIRA, Alex de Oliveira e; IGNATIUS, Scandar Gasperazzo; FERTONANI, F.L . Investigation of thermal desorption of HCH: temperature and time effects. In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMÉTRICA, 9., 2014, Serra Negra. Anais… Rio de Janeiro: ABRATEC, 2014. 5 p.
Document with restricted access. Log in to BiblioInfo, Library – DAIT/IPT to access the PDF text:
http://escriba.ipt.br/pdf_restrito/173113.pdf
