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| Titel |
Application of gas chromatographic method in simultaneous measurements of helium, argon and neon concentration in groundwaters |
| VerfasserIn |
J. Najman, J. Bielewski, I. Śliwka |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067429
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| Zusammenfassung |
| Helium concentration in groundwater is a fine indicator in water dating in a range from a
hundred to tens of thousands of years. Gas chromatography (GC) measurements of helium
can be used as an alternative to mass spectrometry (MS) determinations of 4He for
groundwater dating [1].
Argon and neon concentrations mainly serve for determining the temperature of recharge
and the air excess which is needed to correct measured values of helium concentration [2]
.
A chromatographic measurement system of helium, argon and neon concentration in
groundwater is presented [3]. Water samples are taken from groundwater with a precise
procedure without contamination with air in a special stainless steel vessels of volume equal
to 2900 cm3. Helium is extracted from water samples using the head-space method. After
enrichment by cryotrap method helium is analyzed in the gas chromatograph equipped
with the thermal conductivity detector (TCD) with detection limit of about 2.8 ng
He. The helium limit of detection of presented method is 1,2-
10-8 cm3STP/gH2O
[4].
We are currently working on adapting the method of cryogenic enrichment of helium
concentration for simultaneous measurements of the concentration of helium, argon and neon
using single sample of groundwater. Neon will be measured with the thermal conductivity
detector and capillary column filled with molecular sieve 5A. Argon will be analyzed also
with the thermal conductivity detector and packed column filled with molecular sieve
5A.
This work was supported by grant No. N N525 3488 38 from the polish National Science
Centre.
[1] A. Zuber, W. Ciężkowski, K. Różański (red.), Tracer methods in hydrogeological
studies – a methodological guide. Wroclaw University of Technology Publishing House,
Wroclaw, 2007 (in polish).
[2] P. Mochalski, Chromatographic method for the determination of Ar, Ne and N2 in
water, Ph.D. thesis, Institute of Nuclear Physics Polish Academy of Sciences in Krakow,
2003 (in polish).
[3] A. Żurek, P. Mochalski, Use of the gas chromatographic method for the
denitrification process assessment in groundwater of the Triassic aquifer in Opole
region (southern Poland), Geology, Quarterly, AGH, 36, z.1, 135-148, 2010 (in
polish).
[4] J. Najman, Development of chromatographic measurement method of helium
concentration in groundwater for the purpose of dating in the hydrological issues,
Ph.D. thesis, Institute of Nuclear Physics Polish Academy of Sciences in Krakow,
2008, http://www.ifj.edu.pl/SD/rozprawy_dr/rozpr_Najman.pdf?lang=pl(in polish). |
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