Wyniki wyszukiwania - BazTech

1

Cadmium in pork and poultry liver in southern Poland

Kleszcz K., Jędryka W.

Science, Technology and Innovation

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2018

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Vol. 3, no. 2

9--12

EN

Samples of pork and poultry livers (ten samples of each type, purchased in southern Poland) were analyzed in order to determine the cadmium concentration. Wet digestion of the samples was carried out and the concentration of cadmium was measured by means of graphitefurnace atomic absorption spectrometry (GF-AAS). The mean values for pork and poultry livers were 79.3 µg/kg and 165.3 µg/kg, respectively. In one sample of poultry liver the Cd concentration was 1043 µg/kg, which is much more than the legal limit for the European Union (500 µg/kg). Statistical analysis showed that there was no significant difference in Cd concentration between the two groups of the samples, unless the highest result (1043 µg/kg) was considered an outlier.

2

Modeling of the Cs137 and Sr90 contamination transportation process performed for the vicinity of National Radioactive Wastes Disposal in Różan : NE Poland

Miecznik M., Mietelski J. W., Łokas E., Kleszcz K.

Computer Science and Mathematical Modelling

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2018

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No. 7

19--30

EN

This paper contains the results of radionuclides transportation modeling under National Radioactive Waste Disposal (NRWD) grounds in Różan (northeast Poland). The disposal is of the low- and intermediate-level waste (LILW) type. We simulated the radionuclides transportation process through sandy soils. The simulation was performed in a self-written simulator in Scilab using the finite difference method. The model included diffusion, advection and radioactive decay. The model was tested according to convergence and stability. Assuming the hydrological gradient being 0.008, the contamination transportation time was 30–46 years depending on the modeled problem. The modeled distance of 600 m was from underneath the disposal to the exudation in the Narew ravine. Radioactive decay for both cesium (Cs 137) and strontium (Sr 90) had a significant impact on the results. The model proved to be a useful tool for performing simple scientific simulations. This survey was part of a PhD thesis.

PL

Artykuł zawiera wyniki modelowania transportu potencjalnego skażenia Cs 137 i Sr 90, przeprowadzonego dla wód podziemnych pod Krajowym Składowiskiem Odpadów Promieniotwórczych w Różanie (północno-wschodnia Polska). KSOP jest składowiskiem odpadów nisko- i średnioaktywnych. Modelowanie zostało przeprowadzone w samodzielnie napisanym symulatorze, w programie SciLab, z wykorzystaniem metody różnic skończonych. Symulowano proces transportu radionuklidów przez piaszczyste gleby. Model zawierał dyfuzję, adwekcję i rozpad promieniotwórczy. Model został przetestowany pod względem zbieżności i stabilności. Modelowany czas transportu skażeń spod dna składowiska do koryta rzeki Narew, przy założeniu gradientu hydrologicznego 0.008, wynosił od 30 do 46 lat w zależności od przyjętego scenariusza. Modelowany dystans wynosił 600 m. Rozpad promieniotwórczy miał znaczący wpływ na uzyskane rezultaty. Modelowanie potwierdziło, że symulator jest użytecznym narzędziem do przeprowadzania prostych, naukowych symulacji. Przeprowadzone badania były częścią pracy doktorskiej.

3

Oznaczanie ceru w kamieniach do zapalniczek metodą spektrofotometrii Uv-Vis

Kleszcz K., Mika M.

Tarnowskie Colloquia Naukowe. Nauki Techniczne i Ścisłe

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2017

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T. 4, nr 3

125--128

PL

W pracy opisano pomiar zawartości ceru w kamieniach do zapalniczek metodą spektrofotometryczną, która wykorzystuje tworzenie barwnego kompleksu ceru z formaldoksymem. W celu uzyskania wiarygodnych wyników, konieczne okazało się oddzielenie obecnego w próbkach żelaza. Dokonano tego wykorzystując metodę wytrącania szczawianu ceru.

EN

Determination of cerium in ferrocerium lighter flint stone by means of spectrophotometry is described. The method is based on the formation of cerium-formaldoxime complex. In order to achieve accurate results, it was necessary to separate iron which was present in the samples. It was achieved by precipitation of cerium oxalate.

4

Determination of copper, manganese and chromium in wine

Smoleń P., Sekuła E., Kleszcz K.

Science, Technology and Innovation

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2017

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Vol. 1, no. 1

35--38

EN

The aim of the study was to determine the content of copper, manganese and chromium in white and red wines available on Polish market. The results have been compared with similar studies of other researchers as well as with the recommendations regarding dietary intake of analysed elements. Statistical analysis showed that there was a statistically important difference in manganese and copper content between the two groups of wines.

5

A sequential procedure for determining 238Pu, 239+240Pu, 241Am, 90Sr, U and Th activities in soils and peats from Spitsbergen

Łokas E., Mietelski J. W., Kleszcz K., Tomankiewicz E.

Nukleonika

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2010

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Vol. 55, No. 2

195-199

EN

This paper presents results of application of a sequential radiochemical procedure for multi-elemental analyses for samples collected in the Arctic environment. The levels of activity of 238Pu, 239+240Pu, 241Am, 90Sr and the content of natural radioisotopes (238U, 234U and 232Th, 230Th) were investigated in soils and peats in the proglacial zone of the Werenskiold glacier and on the strandflat in the vicinity of the glacier. Results on activity concentration shows general low level of radioactive contamination. Procedure was checked using reference materials. Reasonable recoveries were obtained for almost all analyzed radionuclides except for uranium. Further work is needed to improve this stage.