Search Results

You are looking at 1 - 3 of 3 items for

  • Author or Editor: T. Hofmann x
  • Refine by Access: All Content x
Clear All Modify Search

The present article discusses the applicability of thermoanalytical methods in the analysis of Hungarian soils formed on carbonate rocks. Up to now only limited mineralogical and soil chemical research has been done on these soils. Soils from the Bükk Mountains, the most varied limestone region in Hungary, were used for the investigations. The aim was to extend our incomplete knowledge on the mineral composition and formation processes of these soils and to demonstrate the possibilities and evaluation potential of thermoanalytical techniques. All the soils investigated were formed on limestone and had different surface soil thickness, influenced by the accumulation of silicate debris and the microterrain. The results of soil mineralogical analysis revealed an extraordinarily high proportion of quartz compared to that of other minerals (especially calcite), indicating that these soils could not have originated solely from the weathering of the limestone bedrock. The results also showed that thermoanalytical methods could complement classical chemical and instrumental (XRPD) methods in research on the genesis of soils formed on limestone.

Restricted access


One of the most suitable methods for analytical on-line determination of actinides in solutions of reprocessing plants is X-ray fluorescence analysis. For stability and for economy of space radionuclides are preferable as excitation sources. The excitation and the measurement of the K-lines has a number of advantages in comparison to the L-lines: the fluorescence yield is higher, the penetration is better, and the resolution is better. To lower the background due to scattering radionuclides with -energies of about 300 keV are preferable.75Se,113Sn,125Sb,131I,133Ba,192Ir,203Hg, and231Pa have been proposed,133Ba was used in this work. The following arrangement was built up: a HPGe-detector, two133Ba sources in 45o position, detector and source collimators made from tin and a sample tube diameter of 130 mm with technical glass or stainless steel of up to 6 mm thickness as tubing material. The measuring time was 10 min. Using this arrangement the calibration curve for uranium was measured in the range from 5 mg/l to 400 g/l. In mixtures of Th and U interferences were observed and corrected for. Samples of Np and Pu were also measured. Determination of Th, U, Np and Pu in mixtures in absence and in presence of other radionuclides is discussed.

Restricted access

The Sopron Wine Region is one of the most significant and historical wineproducing regions in Hungary, with a total area of 4300 hectares, out of which 1800 hectares are used for grapevine cultivation. The aim of the present research was to carry out basic measurements for soil, grape and wine in the Sopron Wine Region to obtain preliminary results for future investigations.The demonstrated methods are suitable for the combined analysis of soils, grape berry and wine. It was established that there are differences between the composition of grape berry and wine of the selfsame vine cultivar in the investigated areas. The terroir effects of the Sopron Wine Region have not been studied as yet extensively, although there are several international studies in this field (e.g. Hugget, 2006; Csikász-Krizsics & Diófási, 2008; Fernández-Marín et al., 2013). By future measurements carried out on a large number of samples and with sophisticated multivariate statistical analysis the relationships between measured physical and chemical parameters can be evaluated in the region, providing basis for establishing terroir aspects.

Restricted access