The growth of the global population had led to a sharp increase in water demand in recent decades. The isotope method of groundwater dating has been used to estimate the average age of groundwater in wells. As dissolved inorganic carbon DIC is almost ubiquitous in groundwater, carbon is a widely used groundwater radiation dating technology. This study conducted the dating analysis of carbon and tritium in seawater using its characteristics of indication age, retrospective source and path. The results showed that the shallow groundwater in study area was modern water, suggesting that rainfall infiltration was the main source of groundwater recharge. However, the results of 14 C dating of groundwater sample in deep well were greater than , and the concentration of tritium in water samples were close to 0 TU, meaning that the deep groundwater extracted at present was not made by modern rainfall replenishment.
USGS -- Isotope Tracers -- Resources
Trinitrotoluene TNT and dinitrotoluene DNT originating from 50 years of explosives production have heavily contaminated two stacked aquifers in the vicinity of Lisboa, Portugal. To assess if these poly-nitroaromatic compounds P-NACs are being degraded in the subsurface, tracer-based groundwater dating techniques combined with compound-specific isotope analyses CSIA were applied. The groundwater residence times were distinctly different in the two aerobic aquifers, as determined by the tritium 3 H - 3 He method. P-NACs-containing waste waters are known to have leaked into the upper, unconfined aquifer. However, P-NACs were present in both aquifers in high concentrations up to microg L -1 TNT , which implies a hydraulic connection, although tritium concentrations and chemical data suggest two separated aquifers.
ICGRMDT 2021: 15. International Conference on Groundwater Resources Mapping and Dating Techniques
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Argon can be used as a tracer for age-dating glaciers, oceans, and more recently, groundwater. With a half-life of years, 39Ar fills an intermediate age range gap , years not currently covered by other common groundwater tracers. Therefore, adding this tracer to the data suite for groundwater studies provides an important tool for improving our understanding of groundwater systems.