The heavy metal (cadmium, Cd; chromium, Cr; copper, Cu; nickel, Ni; lead, Pb and zinc, Zn), sodium (Na) and sulphur (S) contamination of roadside topsoils and the accumulation of these elements in chicory (Cichorium intybus L.) as indicator plant was studied at different sites in Nyíregyháza (Hungary) between 1994 and 1996. In roadside urban topsoils (collected from a depth of 0–10 cm at a distance of 0.1 or 0.2–4.0 m from..
A theory of the evaluation of kinetic parameters of induction periods for non-isothermal processes is outlined and a method
to obtain the parameters from non-isothermal differential scanning calorimetry measurements, based on the dependence of onset
temperature of oxidation peak on heating rate, is presented. The applicability of the method is demonstrated on the study
of oxidation induction periods of edible oils and polyolefines. In all cases, the parameters of an Arrhenius-like equation
describing the temperature dependence of induction period have been obtained. It is shown that the method gives the parameters
not affected by oxygen diffusion which are transferable to be used in modelling the non-isothermal induction periods where
the effects of diffusion, heat transfer and evolution of reaction heat are explicitly involved. A method of estimating the
residual stability after a thermooxidative stress of the material is suggested.