Using 81Kr and isotopic tracers to characterise old groundwater in the Bangkok metropolitan and vicinity areas
Journal Article
·
· Isotopes in Environmental and Health Studies (Online)
- Thailand Institute of Nuclear Technology (TINT), Nakhon Nayok (Thailand)
- Federal Office for Civil Protection (FOCP), Spiez (Switzerland). Spiez Laboratory
- Ministry of Natural Resources and Environment, Bangkok (Thailand). Department of Groundwater Resources
- International Atomic Energy Agency (IAEA), Vienna (Austria)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
Krypton-81 was applied to investigate the age of groundwater in the aquifer system in the Bangkok metropolitan and vicinity areas. Stable (2H, 18O and 13C) and radioactive (3H, 85Kr and 14C) isotopes and noble gases were applied in parallel. Low levels of 14C and significant radiogenic 4He confirm that groundwater in the deep aquifers is older than 30 ka. 81Kr analysis identified groundwater with ages ranging from 17 to 300 ka. At some sites, large age discrepancies between 81Kr and 14C indicated that inter-aquifer mixing is likely occurring. The interpretation of the noble gases suggests that groundwaters in the deeper aquifers, with apparent ages of 300 to 10 ka, have recharged in slightly colder and wetter climates than those found in the upper aquifers with apparent ages < 10 ka. Degradation of water quality from seawater intrusion was identified in the upper four aquifers. This was also evidenced by higher δ18O and δ2H values, typical of seawater. The four deeper aquifers contain high quality water characterised by less enriched 18O and 2H. In conclusion, this work presents new findings of very old groundwater in the Bangkok aquifer system.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2523633
- Journal Information:
- Isotopes in Environmental and Health Studies (Online), Journal Name: Isotopes in Environmental and Health Studies (Online) Journal Issue: 4-6 Vol. 59; ISSN 1477-2639
- Publisher:
- Taylor & FrancisCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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