scholarly journals The effect of fertilization with brown coal on Haplic Luvisol humic acids

2011 ◽  
Vol 48 (No. 1) ◽  
pp. 33-39 ◽  
Author(s):  
B. Dębska ◽  
A. Maciejewska ◽  
J. Kwiatkowska
Keyword(s):  
Thermal Decomposition ◽  
Elemental Composition ◽  
Humic Acids ◽  
Brown Coal ◽  
Decomposition Process ◽  
Lower Content

The influence of fertilization with brown coal (used as preparation called Rekulter) on properties of humic acids extracted from haplic luvisol was studied. Characteristics of humic acids were identified by their elemental composition, thermal decomposition, and infrared and UV-VIS spectra. It was found that humic acids formed during decomposition process of Rekulter in soil were characterised by a higher content of carbon (38.6% versus 35.4%), a lower content of nitrogen (1.50% versus 2.73%) and a higher resistance to thermal decomposition, when compared with humic acids extracted from soils without Rekulter application. Due to special properties of Rekulter, additional liming did not affect the properties of humic acids.

scholarly journals Thermal behavior and decomposition kinetics of rifampicin polymorphs under isothermal and non-isothermal conditions

2010 ◽  
Vol 46 (2) ◽  
pp. 343-351 ◽  
Author(s):  
Ricardo Alves ◽  
Thaís Vitória da Silva Reis ◽  
Luis Carlos Cides da Silva ◽  
Silvia Storpírtis ◽  
Lucildes Pita Mercuri ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Melting Process ◽  
Decomposition Process ◽  
Stable Form ◽  
Thermal Decomposition Process ◽  
Mean Values ◽  
Conversion Level ◽  
Polymorphic Forms ◽  
Crystalline Forms

The thermal behavior of two polymorphic forms of rifampicin was studied by DSC and TG/DTG. The thermoanalytical results clearly showed the differences between the two crystalline forms. Polymorph I was the most thermally stable form, the DSC curve showed no fusion for this species and the thermal decomposition process occurred around 245 ºC. The DSC curve of polymorph II showed two consecutive events, an endothermic event (Tpeak = 193.9 ºC) and one exothermic event (Tpeak = 209.4 ºC), due to a melting process followed by recrystallization, which was attributed to the conversion of form II to form I. Isothermal and non-isothermal thermogravimetric methods were used to determine the kinetic parameters of the thermal decomposition process. For non-isothermal experiments, the activation energy (Ea) was derived from the plot of Log β vs 1/T, yielding values for polymorph form I and II of 154 and 123 kJ mol-1, respectively. In the isothermal experiments, the Ea was obtained from the plot of lnt vs 1/T at a constant conversion level. The mean values found for form I and form II were 137 and 144 kJ mol-1, respectively.

Mechanism of CO2 Capture Technology Based on the Phosphogypsum Reduction Thermal Decomposition Process

2017 ◽  
Vol 31 (9) ◽  
pp. 9824-9832 ◽  
Author(s):  
Siqi Zhao ◽  
Liping Ma ◽  
Jie Yang ◽  
Dalong Zheng ◽  
Hongpan Liu ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Co2 Capture ◽  
Decomposition Process ◽  
Thermal Decomposition Process
Sign in / Sign up

Export Citation Format

Share Document