Thermal stability of the FeIIIEDTA complex in its monomeric form
MetadataShow full item record
Thermal degradation of the solid monomeric Na[FeEDTA(H2O)]·2H2O EDTA=ethylenediaminetetraacetate anion) complex was studied in air by simultaneous thermogravimetry and differential thermal analysis (TG/DTA) coupled on-line with a quadrupole mass spectrometer for evolved gas analysis (EGA-MS). The solid products were analysed by Mössbauer spectroscopy. A four-step decomposition was observed until 500 ?C by TG/DTA–EGA-MS, involving first the release of two molecules of crystal lattice water then one coordinatedwater molecule and above 200 ?C, the release of CO2 as a result of degradation of a carboxylate arm of the EDTA ligand. While releasing CO2, reduction of the ferric iron to ferrous iron was observed by Mössbauer spectroscopy. Two ferrous species have been found to form simultaneously which are assumed to be configurational isomers since their aerial oxidation resulted in the formation of the same -oxo dimeric iron(III) species. Reaction pathway for this oxidation is proposed. Finally, the organic residues are burnt out rapidly accompanied by a very sharp exothermic heat effect between 280 and 330 ?C; meanwhile magnetite is formed.
Showing items related by title, author, creator and subject.
Well-crystallized mesoporous samaria-doped ceria from EDTA-citrate complexing process with in situ created NiO as recyclable templateRan, R.; Guo, Y.; Zheng, Y.; Wang, K.; Shao, Zongping (2010)A facile EDTA-citrate complexing process with in situ created recyclable NiO as inorganic template was developed for the synthesis of mesoporous samaria-doped ceria (SDC) at high temperatures. By applying metal nitrates ...
Effects of nisin, EDTA and salts of organic acids on Listeria monocytogenes, Salmonella and native microflora on fresh vacuum packaged shrimps stored at 4 °CWan Norhana, M.; Poole, S.; Deeth, H.; Dykes, Gary (2012)Nisin (500 IU ml−1), EDTA (0.02 M), potassium sorbate (PS) (3%, w/v), sodium benzoate (SB) (3%, w/v) or sodium diacetate (SD) (3%, w/v); alone or in combination were used to dip uninoculated shrimps and shrimps inoculated ...
Jones, Franca; Jones, Philip; Ogden, Mark; Richmond, William; Rohl, Andrew; Saunders, M. (2007)Ethylenediaminetetraacetic acid (EDTA) is a known complexing agent that interacts with a host of cations. In this paper, various techniques are used to elucidate the mechanism of interaction between EDTA and barium sulfate ...