Repository of the Institute for Material Testing (RIMS)
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Identification of oil-type pollution in recent sediments
No full textAn attempt was made to determine the origin of soluble organic matter and to identify oil-type pollution, on the basis of n-alkane abundance and distribution patterns in the alkane fractions (determined by gas chromatography, GC), as well as on the basis of the carbon isotope ratio (δ 13 C(PDB)) of dominant n-alkanes (determined by gas chromatography - mass spectrometry, GC-MS). 17 samples of alluvial sediments from three, ecochemically different areas were investigated
The influence of high pressures on structural changes of some minerals
No full textAn X-ray analysis of some of the most frequently found minerals in natural silicate soils that have previously been subjected to pressures of up to 19 GPa has been performed. The test results have shown that the increase of pressure on the surface of polycrystal particles of some minerals leads to formation of an amorphous layer. This means that on the mineral particles' surface contacts, where high pressures act, thicker or thinner amorphous layers are formed. These layers, with their various properties, influence changes of engineering properties of natural soils. The newly formed amorphous particles, under certain conditions, behave as dispersed colloid systems with directed charged micelles (particles), the system passes from a flocculate to a dispersely directed state due to which the natural soil starts to move, (settle or slide)