Wyniki wyszukiwania - Biblioteka Nauki

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Nowość na rynku usług lojalnościowych B2B. Z Jackiem Gliniakiem - General Managerem agencji marketingu zintegrowanego NAIROBIA - rozmawiała...

100%

Gorczyca Z.

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nr 01-02

2

The N2O correction in mass-spectrometric analysis of CO2

84%

Gorczyca Z. , Piasecka M.

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tom Vol. 49, nr 2

37-42

EN

During cryogenic separation of CO2 from atmosphere and soil air for isotopic analyses, N2O present in the air condenses together with CO2. The N2O, having the same molecular masses (44, 45 and 46) as CO2, seriously affects the results of 13C and 18O isotope analyses of carbon dioxide, making it necessary to introduce appropriate corrections. A simple method of correcting the measured ä13C and ä18O values of the analysed CO2 was developed. It requires experimental determination of several parameters of the used mass spectrometer and changes in the computational algorithm. The performance of the method was tested using N2O CO2 mixtures. The experiments showed that the proposed correction method removes the effect of presence of N2O in the analysed CO2 sample down to analytical uncertainty of the measurement. This method was adopted in routine analyses of stable isotope composition of carbon dioxide in atmospheric and soil air samples being performed in our laboratory.

3

Doceń pracownika - to się opłaca. Z Moniką Romaniuk - dyrektorem marketingu i rozwoju Bonus System Polska S.A. - rozmawia...

84%

Gorczyca Z.

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2011

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nr 10-11

4

Strategia i emocje. Z Ricardem Bragą - dyrektorem generalnym i kreatywnym agencji reklamowej Duda Polska - rozmawia...

84%

Gorczyca Z.

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nr 01-02

5

Seasonal variability of the soil CO2 flux and its isotopic composition in southern Poland

67%

Gorczyca Z. , Rozanski K. , Kuc T. , Michalec B.

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2003

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tom Vol. 48, nr 4

187-196

EN

The flux and isotopic composition of soil CO2 has been monitored at three sites located in the southern Poland, during the time period: January 1998 - December 2000. The sites represent typical ecosystems appearing in central Europe: mixed forest, cultivated agricultural field and grassland. To monitor the flux and isotopic composition of soil CO2, the method based on the inverted cup principle was used. The flux of soil CO2 reveals distinct seasonal fluctuations, with maximum values up to ca. 20 mmolźm-2 h-1 during summer and around ten times lower values during winter. Also significant differences among the monitored sites were detected, the CO2 flux being the highest for the mixed forest site and ca. two times lower for the grassland site. The 13C content of the soil CO2 flux is nearly constant throughout the year, with d13C values essentially reflecting the isotopic composition of the soil organic matter and the vegetation type. The 18O content of the soil CO2 flux shows a remarkable seasonality, with distinctly less negative d18O values recorded during summer. This seasonality is highly reduced in the CO2 sampled from different depths of the soil. The radiocarbon content of the CO2 flux turned out to be non-distinguishable, within the uncertainty of the measurements, from current 14C levels in atmospheric carbon dioxide. However, significant reduction of the radiocarbon content was measured in the soil CO2 sampled at 80 cm, when compared to the uppermost layer, reflecting increasing age of soil organic matter with depth.

6

Carbon dynamics in soil recorded by 14C: model calculations

67%

Kuc T. , Gorczyca Z. , Kapusta M.

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2004

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tom Vol. 23

45-50

EN

Time records of 14CO2 from soil respiration collected in the years 1998 to 2003 on sites representing different ecosystems (mixed wood, agricultural field and grassland, southern Poland), were analysed by use of MLB model built for this purpose. The modelled turnover time (TT) is maximum 22 yr for the agriculturally cultivated soil and only 14 yr for soil under grassland and mixed forest. About 22% of an old component of 1500 yr was admixed to the agriculturally cultivated soil while it was only 12% under mixed forest. Estimated ratio of carbon content in slow and in fast decomposition boxes varies from 22 to 40 in southern Poland pointing to slow decomposing organic compounds as the major pool of carbon in soil. The lowest ratio was observed for soil of low proportion of organics content in mixed forest, and the highest for grassland of well developed soil profile. D14C time records for not cultivated soils (under grassland and mixed forest) showed higher values than local atmospheric CO2, moreover 14CO2 from the mixed forest soil respiration remarkable exceeded "clean air" reference level for Central Europe.

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Określanie wieku wód podziemnych z wykorzystaniem izotopów środowiska – uwagi metodyczne

67%

Duliński M. , Różański K. , Gorczyca Z. , Marzec M.

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tom Vol. 65, nr 11/1

1049--1054

EN

Groundwater age plays an important role in both development and management of groundwater resources. This is particularly true for groundwater systems being exploitedfor drinking water purposes and subject to anthropogenic stress. Environmental isotopes play a vital role in quantifying time scales of groundwater flow, ranging from fraction of a year to millions of years. Over the past several decades a large number of groundwater age indicators have been proposed. Apart of radioactive isotopes, also stable isotopes of water, isotopes of noble gases and anthropogenic trace substances present in the atmosphere have been usedfor this purpose. This work is focusing on methodological aspects of groundwater age determinations using tritium, radiocarbon and stable isotope composition of water. The discussion is based on a rich material available after several decades of application of environmental isotope techniques in groundwater studies in Poland.

8

Zmienność parametrów chemicznych i izotopowych wody z odwiertu Franciszek w Wysowej-Zdroju

67%

Duliński M. , Demska-Sięka P. , Rajchel L. , Gorczyca Z.

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tom Vol. 65, nr 11/1

951--955

EN

Mixing of two water components and simultaneous contact with geogenic carbon dioxide are the characteristic features of waterfrom the Franciszek borehole in the Wysowa-Zdrój. During the last 45 years a systematic, slow decrease of water mineralization of this borehole has been observed. This may be due to several reasons: i) increased contribution of the infiltration component in the total inflow to the well, ii) gradual decrease of mineralization of diagenetic water or, iii) local changes of gaseous, geogenic carbon dioxide within the reservoir. Results of chemical and stable isotope measurements from the timespan of 42 years are discussed in the paper. The PHREEQC code was used in the analysis of chemical data and in the numerical simulation ofpossible processes leading to the observed changes in the water mineralization. Results of chemical calculations and stable isotope data are consistent and prove that decrease of water mineralization in the Franciszek borehole is caused by increased contribution of water of infiltration origin.