Abstract
Fulvic acids of the DOC of five deep (139–409 m) groundwaters were recovered (adsorption on DEAE-cellulose) and used for age determination (14C determined by accelerator mass spectrometry), and compared with fulvic acids recovered from a shallow groundwater and a surface water. The composition of the seven different fulvic acids was similar, despite variations in hydrochemical conditions and residence times, indicating a high stability of this molecular weight fraction. The ages calculated from the 14C-content of the fulvic acid fraction (600 to 10000 y) are less than the ages indicated from analyses of the dissolved carbonate (data available for three sites). Using a fraction of the DOC with high stability (like the fulvic acid fraction) as a 14C-source when assessing the ages of subsurface waters, appears to be superior to using dissolved carbonate.
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© 1991 Springer-Verlag
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Pettersson, C., Allard, B. (1991). Dating of groundwaters by 14C-analysis of dissolved humic substances. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010465
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DOI: https://doi.org/10.1007/BFb0010465
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