34 Result(s)
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Article
The future demand for geological reference materials
Geological RMs (G-1 and W-1) were introduced in 1951 for the purpose of validating the accuracy of silicate rock analysis by dc arc spectrography. Since then the introduction of an array of other spectrographi...
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Article
An uncertainty budget for trace analysis by isotope-dilution ICP-MS with proper consideration of correlation
Isotope-dilution mass spectrometry (IDMS) is considered to be a method without significant correction factors. It is also believed that this method is well understood. But unfortunately a large number of diffe...
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Article
Recognizing heterogeneous distribution of platinum group elements (PGE) in geological materials by means of the Re–Os isotope system
The identification of uncertainties caused by sample inhomogeneity, as distinct from those caused by sample preparation and measurement, is a challenging task. Use of chemometric methods to separate and estim...
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Book review
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Article
Book review
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Book review
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Review on problems, techniques and trends in thermal analysis
Die wichtigsten Probleme der Thermoanalyse werden besonders im Hinblick auf die analytische Chemie kritisch besprochen. Fragen der Nomenklatur und Standardisierung sowie des Aufbaus von Meßsystemen werden beha...
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Article
Letter to the editor
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The thermal stabilities of alkali metal alkanoates. Part IV
The thermal stabilities of long-chain lithium and potassiumn-alkanoates from tridecanoate to eicosanoate have been investigated up to 873 K with a MOM derivatograph. The results obtained, together with available ...
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Article
Calorimetric test of purity II
Dynamic and stepwise purity test techniques were compared, and it was established that in dynamic measurement the sample in many cases can not be considered to be in a state of equilibrium from the thermodynam...
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Article
Calorimetric test of purity I
Relationships of various levels for the thermodynamical description of two-component eutectic systems have been investigated. It has been established that the van't Hoff relationship describes the melting curve d
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The thermal stabilities of alkali metal alkanoates part III
Simultaneous DTA, TG and DTG analysis has been performed on potassiumn-alkanoates from pentanoate to dodecanoate in the range between room temperature and 873 K. Information has been obtained on the thermal decom...
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Article
On the thermal stability of alkali metal alkanoates II
Lithiumn-alkanoats from pentanoate (LiC5) to dodecanoate (LiC12) have been investigated with regard to their thermal stabilities. None of these salts are stable in the molten state when oxygen is present, but in ...
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Article
The thermal stabilities of alkalimetal alkanoates Part I
Thermal analysis of Li, Na and K isobutyrates, Li and Na isovalerates, and Li and Na isocaproates has been performed between room temperature and 873 K under both inert and oxygen atmospheres. Information has ...
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Article
Preparation and investigations of polyimides III
Polyamide acid powders of pyromellitic dianhydride and 4,4′-diaminodiphenyl ether base were prepared in tetrahydrofuran, in the heterogeneous phase. The imidization of these powders was investigated by thermog...
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Article
Modelling of quantitative DTA equipment I. Electric analog approach
For an electric model, relationships have been established as a function of the DTA baseline shift, the intensity of the signal, the slope of the leading edge, the heating rate, the thermal resistance of the h...
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Article
Present state of teaching Analytical Chemistry in Hungary
Ein Überblick wird gegeben über die Möglichkeiten der Ausbildung in Analytischer Chemie an Universitäten und Technischen Hochschulen in Ungarn, wobei Unterschiede und Gemeinsamkeiten aufgezeigt werden. Fragen ...
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Article
Thermal behaviour of thallium(I) fatty acid salts, II
The electrical conductivity (EC) changes of thallium(I) salts of fatty acids, which possess liquid crystalline phases, were investigated as a function of temperature. It was found that sharp EC jumps are assoc...
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Thermal behaviour or thallium(I) fatty acid salts, I
We have studied the thermal behaviours of the fatty acid (C1-C9, C12, C14, C16 and C18) thallium(I) salts.
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Article
Investigation of the thermal behaviour of fatty acid sodium salts
The thermal and thermo-electrical behaviour and properties, as well as the type structure and appearance of the liquid crystalline phases of the sodium salts of saturated, non-branching fatty acids were invest...
