Analysing Groundwater Using the 13C Isotope

Coastal Aquifer Salinization in Semi-Arid Regions: The Case of Grombalia (Tunisia)

“…The simultaneous increase of Mg 2+ /Ca 2+ with δ 13 C values characterizing most of the samples from the deep aquifer suggests the incongruent dissolution caring out at saturation state towards the calcium [46]. In fact, the increase in δ 13 C of TDIC with the increase of the of Mg 2+ /Ca 2+ ratio highlight an evolution towards closed system.…”

“…The plot of groundwater δ 13 CTDIC signatures versus nitrate (Figure 12) reveals that samples with high nitrate values are depleted in δ 13 C. In fact, in the areas with dominant agricultural activities, located mainly in the center of the basin, high nitrate contents can be related to the return of irrigation water, especially where flood irrigation is still adopted with the excessive use of fertilizers. The simultaneous increase of Mg 2+ /Ca 2+ with δ 13 C values characterizing most of the samples from the deep aquifer suggests the incongruent dissolution caring out at saturation state towards the calcium [46]. In fact, the increase in δ 13 C of TDIC with the increase of the of Mg 2+ /Ca 2+ ratio highlight an evolution towards closed system.…”

Variations on a method for evaluating decadal-scale changes in the groundwater quality of two GAMA coastal study units 2004–14, California GAMA Priority Basin Project

“…Changes in δ 13 C do not indicate a change in groundwater quality, but could indicate that groundwater recharge or mineralization conditions changed in the aquifer (Awad, 2014). The decrease in δ 13 C in groundwater can also reflect atmospheric decreases in δ…”

Variação sazonal da composição geoquímica e isotópica das águas do Aquífero Bambuí no Oeste da Bahia, Brasil

“…Além disso, a razão isotópica do carbono inorgânico dissolvido informa sobre os processos biogeoquímicos e indica as fontes de carbono inorgânico dissolvido da água subterrânea (CLARK; FRITZ, 1997). Neste horizonte de sentidos, Awad (2014) e Van Geldern et al (2015) complementam que as espécies químicas de carbono atmosférico, ou presentes no ar do solo, na matéria orgânica e nos minerais carbonáticos se destacam enquanto fontes do carbono inorgânico dissolvido na água subterrânea. Zhao et al (2018) e Marques et al (2019) assinalam que o comportamento do carbono inorgânico dissolvido (CID) e da razão isotópica em δ 13 CCID na água de aquíferos cársticos depende do clima, da geomorfologia, da influência das águas superficiais, da dissolução de carbonatos e da entrada do CO2 no solo.…”