Reproducibility of Radiokrypton in Deep Desert Aquifers: Insights from a Decade of Research
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| Title: | Reproducibility of Radiokrypton in Deep Desert Aquifers: Insights from a Decade of Research |
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| Authors: | Roi Ram, Eilon M. Adar, Werner Aeschbach, Michael Bishof, Avihu Burg, Wei Jiang, Zheng-Tian Lu, Peter Mueller, Roland Purtschert, Guo-Min Yang, Yoseph Yechieli, Reika Yokochi, Jake C. Zappala, Itay J. Reznik |
| Source: | ACS Earth and Space Chemistry. 9:2215-2221 |
| Publisher Information: | American Chemical Society (ACS), 2025. |
| Publication Year: | 2025 |
| Subject Terms: | deep aquifers, Radiokrypton, isotope hydrology, old groundwater dating, atom-trap trace analysis |
| Description: | Great technical advances have been achieved since the first atom-trap trace analysis (ATTA) -based radiokrypton application in Egypt, where 1 Myr old groundwater was discovered. Beyond advances in ATTA measurement capabilities, including reduction in sample size, analysis duration, and analytical uncertainty, major progress has been achieved over the past two decades in the sample collection and preparation techniques. These advances paved the expansion of ATTA-based noble gas applications to many other aquifers worldwide, illuminating the nature and flow pattern of deep groundwater systems. While the potential of this new analytical technique for old groundwater dating is well recognized, another important aspect yet to be examined is the reproducibility of radiokrypton in aquifers over time, i.e., how representative is a discrete groundwater sample, collected at a specific time and location, for the natural groundwater system? The likelihood of a negative answer is increased by flow-field disturbance in aquifers following massive groundwater abstraction. Here, we present repeated 81Kr sampling and measurements in twenty-one sites over Israel, mostly of deep (up to 1 km) wells tapping confined aquifers in the arid to hyperarid Negev desert. The results demonstrate that radiokrypton measurements are indeed reproducible, even in cases where samples were collected as long as nine years apart and from highly productive (∼1 Mm3/yr order) pumping wells. Furthermore, many of the repeated measurements in this study (17 out of the 21 sites) were conducted with different ATTA Instruments in two different laboratories using slightly different sampling, preparation, and analysis techniques, yet with an overall good agreement. The consistency in the ATTA-based 81Kr-dating results over time highlights the robustness of this state-of-the-art technique as a tool to unravel groundwater flow patterns and encourages further applications to many other yet-to-be-explored deep aquifers. |
| Document Type: | Article Other literature type |
| Language: | English |
| ISSN: | 2472-3452 |
| DOI: | 10.1021/acsearthspacechem.5c00121 |
| DOI: | 10.48620/91524 |
| Rights: | CC BY NC ND |
| Accession Number: | edsair.doi.dedup.....dcefd1e5dd0c257e7aab62ca45c793b0 |
| Database: | OpenAIRE |
Nájsť tento článok vo Web of Science | Abstract: | Great technical advances have been achieved since the first atom-trap trace analysis (ATTA) -based radiokrypton application in Egypt, where 1 Myr old groundwater was discovered. Beyond advances in ATTA measurement capabilities, including reduction in sample size, analysis duration, and analytical uncertainty, major progress has been achieved over the past two decades in the sample collection and preparation techniques. These advances paved the expansion of ATTA-based noble gas applications to many other aquifers worldwide, illuminating the nature and flow pattern of deep groundwater systems. While the potential of this new analytical technique for old groundwater dating is well recognized, another important aspect yet to be examined is the reproducibility of radiokrypton in aquifers over time, i.e., how representative is a discrete groundwater sample, collected at a specific time and location, for the natural groundwater system? The likelihood of a negative answer is increased by flow-field disturbance in aquifers following massive groundwater abstraction. Here, we present repeated 81Kr sampling and measurements in twenty-one sites over Israel, mostly of deep (up to 1 km) wells tapping confined aquifers in the arid to hyperarid Negev desert. The results demonstrate that radiokrypton measurements are indeed reproducible, even in cases where samples were collected as long as nine years apart and from highly productive (∼1 Mm3/yr order) pumping wells. Furthermore, many of the repeated measurements in this study (17 out of the 21 sites) were conducted with different ATTA Instruments in two different laboratories using slightly different sampling, preparation, and analysis techniques, yet with an overall good agreement. The consistency in the ATTA-based 81Kr-dating results over time highlights the robustness of this state-of-the-art technique as a tool to unravel groundwater flow patterns and encourages further applications to many other yet-to-be-explored deep aquifers. |
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| ISSN: | 24723452 |
| DOI: | 10.1021/acsearthspacechem.5c00121 |