Wyniki wyszukiwania - BazTech

1

Calibrated geochemical ages of the Baltic Artesian Basin groundwater

Samalavičius Vytautas, Arustienė Jurga

Geologos

|

2022

|

Vol. 28, No. 3

179--189

EN

For the present study, geochemical ages were derived from radiocarbon and radiokrypton age calibration with ground-water chemical contents (Na+, K+, Mg2+, Ca2+, Cl−, SO42−, HCO3−). Geochemical ages may fill the dating gap (40–150 ka) between the isotope techniques mentioned. A case study of groundwater in the Baltic Artesian Basin has involved geochemical age calibration, data filtering (such as regional subdivision of the basin for more accurate results) and geochemical dating of groundwater of unknown age. Various approaches to interpretations of geochemical age results could be used. Bicarbonate and sulphate are sensitive to the hydrochemical environment and should be omitted from geochemical age calculations. Modern fresh groundwater samples should also be excluded from calibration in order to obtain more reliable trend lines. Calcium-sodium cation exchange occurs in deep aquifers and may be used for geo- chemical age determination of fossil groundwater.

2

Zastosowanie metody GC/TCD oznaczania He, Ne i Ar w wodach podziemnych do oceny ich wieku, na przykładzie wód z rejonu Buska-Zdroju

Najman J., Kotowski T., Kasela T., Bielewski J., Śliwka I.

Przegląd Geologiczny

|

2017

|

Vol. 65, nr 11/1

1130--1133

EN

The paper presents the method of chromatographic determination of noble gases concentrations (He, Ne and Ar) in groundwater. He concentration in groundwater is helpful in groundwater dating over a wide range of time. Ne and Ar concentrations are used to calculate excess air and recharge temperature of groundwater. Sulphide waters occurring in Cenomanian sediments in the southern part of the Miechów Trough in Busko-Zdrój, Krzyż and Kazimierza Wielka areas are the subject of research. The results of the noble gases concentrations measurements for boreholes: Busko C-1, Cudzynowice GT-1 and Wełecz S-6 are presented as well as the methodology of calculating concentrations of these gases and groundwater ages.

3

Isotope characterisation of deep aquifers in the Gwda catchment, northern Poland

Kotowski T., Satora S.

Geologos

|

2016

|

Vol. 22, No. 2

137--147

EN

We present the results of isotope measurements (δ18O, δ D, δ13CDIC and 14C) and chemical analyses (TDS, TOC, HCO3–, SO42–, Cl–, NO3–, NH4+, Ca2+, Mg2+ Na+ and K+) conducted on groundwater samples collected from deep Cenozoic aquifers. These aquifers are the basic source of drinking water at numerous localities within the study area in northern Poland. Most of the δ18O determinations are characterised by low variability (i.e., > 70 per cent of δ18O are between –9.5‰ and –9.2‰). In most cases tritium activity was not detected or its content slightly exceeded the uncertainty of measurement (from ±0.3 T.U. to ± 0.5 T.U.). On average, 14C activity is twice higher than that under similar conditions and in hydrogeological systems. The δ13CDIC values fall within the –13.6‰ to –12.8‰ range. A slight variability is observed when considering all isotope and chemical data within the study area and under these hydrogeological conditions. In general, the results of isotope and chemical analyses seem to be homogeneous, indicating the presence of closely similar groundwaters in the system, irrespective of geological formation. It is likely that there is a significant hydraulic connection between shallow and deep aquifers in the Gwda catchment, which indicates the potential for seepage of pollutants from shallow Pleistocene to deep Miocene aquifers. This can endanger the latter by e.g., high concentrations of NO3–, SO42– and Cl– ions from shallow aquifers within the Gwda catchment.

4

Metody analityczne stosowane w ocenie odporności systemów hydrogeologicznych na zanieczyszczenia antropogeniczne

Najman J., Kotowski T., Bielewski J., Śliwka I.

Przegląd Geologiczny

|

2015

|

Vol. 63, nr 10/2

967--971

EN

In this study the method for evaluating resistance hydrogeological systems to anthropogenic pollution using environmental tracers is described. Resistance of groundwater systems to anthropogenic pollution is correlated with the age of water, which can be determined by means of environmental tracers. The paper presents modified chromatographic measurement system which allow for the determination of CFC-11, CFC-12, SF6, Ne, Ar and He. Developed chromatographic system can be used to dating young groundwaters, and the helium method allows for the determination of groundwater age in the range from Holocene to the last interglacial. The developed measurement system of argon and neon in water allows to determine recharge temperature and the amount of "excess air" in groundwater. During the work implementation authors took part in a research project organized by the Université Paris-Sud and Université Rennes, France: Gdat1 intercomparison exercice. This exercise aimed to sampling groundwater from boreholes from the area of Paris (along with 31 laboratories from 14 countries) and test, upon them, developed at IFJ PAN analytical methods measuring CFCs, SF6 and noble gases in groundwater

5

Rozwój metody jednoczesnego pomiaru stężenia helu, argonu oraz neonu do datowania wód podziemnych

Najman J., Śliwka I.

Biuletyn Państwowego Instytutu Geologicznego

|

2013

|

nr 456 Hydrogeologia z. 14/2

419--423

PL

W artykule zaprezentowano chromatograficzną metodę jednoczesnego pomiaru stężenia helu, neonu oraz argonu w wodach podziemnych z pojedynczej próbki wody. Próbki wody podziemnej są pobierane do stalowych naczyń o pojemności 2900 cm3. Gazy są ekstrahowane z wody metodą fazy nadpowierzchniowej (HS). Hel, neon oraz argon są analizowane na dwóch chromatografach gazowych wyposażonych w kolumny kapilarne i pakowane oraz trzy detektory cieplno-przewodnościowe (TCD). Stężenie helu w wodzie podziemnej może być dobrym znacznikiem do datowania wód podziemnych. Poprawne stosowanie znaczników środowiskowych w hydrogeologii w celu datowania wymaga znajomości temperatury zasilania systemu i tzw. „nadmiaru powietrza”. Znajomość nadmiaru powietrza pozwala na konieczną korektę mierzonego stężenia helu w wodzie. Obydwa parametry można wyznaczyć przez pomiar stężenia argonu i neonu w wodzie podziemnej. Opracowana metoda chromatograficzna była zastosowana do datowania wód podziemnych z rejonów między innymi Niecki Podhalańskiej, Krakowa oraz Żarnowca.

EN

In this paper the authors present a chromatographic method for simultaneous analysis of helium, neon and argon in groundwater from one water sample. Water samples are taken to the stainless steel vessels with a capacity of 2,900 cm3. Gases are extracted from water by headspace method (HS). Helium, neon and argon are analyzed on two gas chromatographs equipped with capillary and packed columns and three thermo-conductive detectors (TCD). The concentration of helium in groundwater may be a good environmental tracer for groundwater dating. Proper use of environmental tracers in hydrogeology for dating purpose, requires the knowledge of recharge temperature of the system and the so-called “Excess air”. “Excess air” allows for the necessary correction of measured concentration of helium in water. Both parameters can be determined by measuring the concentration of argon and neon in groundwater. Developed chromatographic method was applied to groundwater dating from areas of Podhalańska Basin, Kraków and Żarnowiec.