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- W2110149158 abstract "Abstract Uptake of atmospheric CO 2 during sample collection and analysis, and consequent lowering of estimated ages, has rarely been considered in radiocarbon dating of groundwater. Using field and laboratory experiments, we show that atmospheric CO 2 can be easily and rapidly absorbed in hyperalkaline solutions used for the extraction of dissolved inorganic carbon, resulting in elevated 14 C measurements. Kinetic isotope fractionation during atmospheric CO 2 uptake may also result in decrease of δ 13 C , leading to insufficient corrections for addition of dead carbon by geochemical processes. Consequently, measured 14 C values of groundwater should not be used for age estimation without corresponding δ 13 C values, and historical 14 C data in the range of 1 to 10% modern Carbon should be re‐evaluated to ensure that samples with atmospheric contamination are recognized appropriately. We recommend that samples for 14 C analysis should be collected and processed in the field and the laboratory without exposure to the atmosphere. These precautions are considered necessary even if 14 C measurements are made with an accelerator mass spectrometer." @default.
- W2110149158 created "2016-06-24" @default.
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- W2110149158 date "2013-08-23" @default.
- W2110149158 modified "2023-10-18" @default.
- W2110149158 title "Lower Groundwater<sup>14</sup>C Age by Atmospheric CO<sub>2</sub>Uptake During Sampling and Analysis" @default.
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- W2110149158 doi "https://doi.org/10.1111/gwat.12110" @default.
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