Thermal analysis has been used to study the composition of paper and paper-like materials for some decades. The application
of these techniques permits to distinguish between the original paper which was used by the artists and possible forgeries.
Quite often, however, the identification of the differences demands the simultaneous application of several other techniques.
The present investigation includes Asiatic wood-prints from China and Japan, and lithographs of European artists, such as
Pablo Picasso, Salvador Dali, and Marc Chagall. Utamaro (1753–1806) is one of the most celebrated artists in the history of
the Japanese woodblock print. He became one of the famous painters of ‘Ukiyo-e’ (Ukiyo-e means transitory world). In China
Utamaro's pictures were also produced. The differences are found in the kind of paper: The Japanese used Mitsumata paper,
while the Chinese printed on Bamboo paper mixed with silk fibers. Hu-j-zong (Nanking, 1619) and a group of famous Chinese
painters created the book of the ‘Ten Bamboo Studio’ which contains woodblock prints as visual aids for young artists. A reprint
of these woodblock prints appeared in 1717. Later, a bootleg of this book appeared in Japan (1817). The differentiation is
possible by thermogravimetric investigation of the used papers. Statistic evaluations in Europe show that more than 1 000
000 bootleg copies of lithographs of Pablo Picasso, Salvador Dali, and Marc Chagall exist. Thermoanalytical measurements allow
the distinction between the original artifacts and the bootlegs. Raman spectroscopy gives an additional possibility for the
distinction between the applied color pigments.
Authors:S. Lehmann, G. Geipel, G. Grambole, and G. Bernhard
Heavy metals like the actinides possess a high risk potential to the environment not only because of their radiotoxicity but
also due to their chemical toxicology. Uranium as one of the major actinide elements has to be considered in particular. Under
reducing conditions, tetravalent uranium occurs primarily in the environment. To date, a lack of appropriate analytical techniques
that featured sufficient sensitivity made it difficult to study the aqueous phosphate chemistry of uranium(IV) as such complexes
show only low solubility. A novel time-resolved laser fluorescence spectroscopy system was set up recently and optimized to
do research on uranium(IV). By application of this laser system we could successfully study uranium(IV) phosphate in concentration
ranges where no precipitation or formation of colloids occurred. At pH = 1.0, U4+ and one uranium(IV) phosphate complex existed in parallel in aqueous solution. The complex could be identified as [U(H2PO4)]3+. Determination of its corresponding complex formation constant via two different evaluation methods resulted in the finding
. Both values prove that [U(H2PO4)]3+ is a very stable complex in solution under experimental conditions. As they are in very good agreement with each other, the
total complex formation constant was determined by means of the weighted average out of (1) and (2). It was calculated to
Authors:Yahya S. Al-Degs, Mohammed Al-Ghouti, and Gavin Walker
elemental analysis as input data, which requires expensive chromatographic analysis [ 13 ].
However, Fourier transform infrared (FTIR) spectroscopy, either mid-IR (MIR) or near-IR (NIR), are among the most trusted analytical techniques in monitoring
For the positional isotopic analysis of tritium-labelled organic compounds which are isolated at the end of a tracer experiment,
it is proposed to render high-resolution triton-NMR spectroscopy sufficiently sensitive as follows. Andrew's rotating magnetic
field is used to narrow the NMR lines that are detected by observing the anisotropy of the β-radiation of the sample which
is kept at 0.01 °K by a helium-dilution refrigerator. In this context, the usefulness of the rotating magnetic field for cryogenic
proton-NMR spectroscopy is pointed out.
violet), water-based and epoxyphenolic lacquers have been characterized as
coatings for possible application in vegetable canning industry. These lacquers
were applied to three different types of tinplates and tin free steel (TFS).
The behaviour of lacquers was monitored applying porosity, flexibility and
infrared (IR) reflectance spectroscopy tests. With IR reflectance spectroscopy
test, we were able to determine the composition of lacquers. Using porosity and
flexibility tests, performed by electrochemical methods, it was possible to
characterize the best lacquer for food canning. In this work the variables
involved in lacquering, e.g. the weight of coating and the degree of
polymerization of lacquers were also taken into account.
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 ]. IR spectroscopy, 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
Authors:M. Gouveia, J. Seabra e Barros, M. Tavares, and M. Freitas
Instrumental neutron activation, atomic absorption spectroscopy and conventional methods of analysis were used on eight different silicate rocks and two minerals. Trace elements and major constituents were determined. It was considered that the methods should be regarded as complementary analytical techniques.
Temperature induced magnetic phase transition in the interstitial compound LaFe11.6Si1.4C0.2 was studied by zero-field Mössbauer spectroscopy. A paramagnetic doublet and a magnetically split sextet co-existed in the
zero-field spectra in the temperature region of 213-218 K, and a thermal hysteresis was observed in the heating and cooling
cycles. The spectra indicate that the magnetic phase transition induced by temperature is of first order for this sample.
Authors:E. Kuzmann, Z. Homonnay, A. Vértes, I. Halász, J. Bánkuti, and I. Kirschner
57Fe Mössbauer spectroscopy was used to study57Fe doped high Tc TlBaCaCuO4.5+y superconductor between 70 and 295 K. Significant anomalous changes in the shape of the Mössbauer spectrum were observed around the Tc /105–120 K/. This experimental fact could be reproduced. Our finding can be associated with structural changes taking place around the Tc in TlBaCaCuO4.5+y superconductor.
The kinetics of the solid-phase interaction in the system -Fe-CuCl2. 2H2O was studied by means of Mössbauer spectroscopy. It was established that compounds of divalent and trivalent iron were formed by diffusion controlled chemical reactions. The experimental results were described by the Juravlev-Lesohin-Templeman equations and the modified parabolic law for the oxidation of metals and alloys.