formed during the calcination of sulfur-rich calcareous oil shales from the Negev deposits were analyzed using FT-IRspectroscopy and curve-fitting technique. These techniques allow the identification of individual thermal phases [ 10
Adsorption of the herbicide terbuthylazine by a soil from the Jezreel Valley was investigated by thermo-IR-spectroscopy. The
adsorption took place mainly by the clay mineral montmorillonite. The adsorbed molecule was hydrogen bonded via the aniline
groups to water molecules which were coordinated to the exchangeable metallic cations. When the sample was thermally treated
at 115°C interlayer water was evolved, part of the herbicide decomposed and the other part became directly coordinated to
the exchangeable metallic cations. The decomposition product contained a CO group.
Authors:Ewa Ostrowska-Ligęza, Agata Górska, Magdalena Wirkowska, and Piotr Koczoń
useful in controlling quality changes in food during processing and in storage [ 10 , 11 ]. IRspectroscopy, on the other hand, serves as an established method to determine types and number of chemical bonds present in a sample and therefore it can be
Summary The reaction of a hydrated nitrate salt of lanthanide (Ln=Pr, Nd, Gd, Dy, Er) with the polyfunctional ligand salicylhydroxamic acid (H3sha), in the presence of base, afforded solid compounds, insoluble in common organic solvents and in water. The new complexes characterized by means of elemental analyses (C, H, N, Ln), magnetic moment determinations and spectroscopic data (IR, MS). It is proposed that they are neutral, with a possible polymeric structure of the general type: [Ln2(Hsha)2(H2sha)(DMF)x(CH3O)(H2O)]n×2H2O Their thermal decomposition was studied in nitrogen and/or oxygen atmosphere, between 25-1000°C by using simultaneous TG/DTG-DTA technique. The IR spectroscopy used to determine the intermediates and the final products. The intermediates at 180°C suggest the formation of N-hydroxylactam complex, which upon further heating gives a carbonaceous residue of Ln2O3 at 1000°C in nitrogen, while in oxygen the stable oxides are formed at 600°C.
The quartz-cristobalite transformation in heated natural chert (flint) rock composed of micro- and ŗypto-quartz was investigated
in the temperature interval of 1000–1300°C by micro-Raman spectroscopy, FT-IR spectroscopy, X-ray diffraction and Scanning
Electron Microscopy. A small amount of crystobalite was first observed in the chert after heating at 1000°C for 1 h and the
transformation was almost completed after heating at 1300°C for 24 h. On the other hand, cristobalite was not detected in
well-crystallized pure quartz after heating under the same conditions. The transformation occurs as a solid state nucleation
and crystal growth of cristobalite replacing quartz at high-temperatures. The chert rock is naturally rich in crystal defects
and boundaries which serve as nucleation sites and enable an earlier quartz-cristobalite transformation.
Authors:Zs. Csanádi, P. Cserjési, N. Nemestóthy, and K. Bélafi-Bakó
FT-IR spectra of various pectin preparations extracted from press cakes of red and black currant, raspberry and blackberry have shown structural differences. Based on the spectra data degree of esterification (DE) of the pectins was determined and found to be in the range of 50–65.