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Lower Groundwater ~(14)C Age by Atmospheric CO_2 Uptake During Sampling and Analysis

机译：采样和分析过程中大气CO_2吸收引起的较低地下水〜（14）C年龄

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摘要

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.
机译：在地下水的放射性碳定年中，很少考虑在样品收集和分析过程中吸收大气中的CO_2，从而降低估计的年龄。通过现场和实验室实验，我们表明，大气中的CO_2可以轻松快速地吸收到用于萃取溶解的无机碳的高碱性溶液中，从而导致〜（14）C测量值升高。大气中CO_2吸收过程中的动力学同位素分馏也可能导致δ〜（13）C降低，从而导致对通过地球化学过程添加死碳的校正不足。因此，在没有相应的δ〜（13）C值的情况下，不应将测得的地下水〜（14）C值用于年龄估算，并且应重新记录历史碳（14）C范围为1％至10％的现代碳。进行评估以确保适当识别具有大气污染的样品。我们建议〜（14）C分析的样品应在野外和实验室中收集和处理，不要暴露在大气中。即使使用加速器质谱仪进行〜（14）C测量，也认为这些预防措施是必要的。

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  • 来源
    《Ground water》 |2014年第1期|20-24|共5页
  • 作者

    Pradeep K. Aggarwal; Luis Araguas-Araguas; Manzoor Choudhry; Michel van Duren; Klaus Froehlich;

  • 作者单位

    Isotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria;

    lsotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria;

    lsotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria;

    lsotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria;

    lsotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria;

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