Dating of groundwaters by ¹⁴C-analysis of dissolved humic substances
1991 (English)In: Humic substances in the aquatic and terrestrial environment : proceedings of an international symposium, Linköping, Sweden, August 21-23, 1989 / [ed] B. Allard, H. Borén and A. Grimvall, Berlin Heidleberg New York: Springer, 1991, 135-141 p.Chapter in book (Refereed)
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.
Place, publisher, year, edition, pages
Berlin Heidleberg New York: Springer, 1991. 135-141 p.
, Lecture Notes in Earth Science, ISSN 0930-0317 ; 33
Environmental Sciences related to Agriculture and Land-use Chemical Sciences
IdentifiersURN: urn:nbn:se:liu:diva-112167ISBN: 3-540-53702-3OAI: oai:DiVA.org:liu-112167DiVA: diva2:764093