Radiocarbon dating on dissolved organic carbon may be a tool for determining residence times of groudwaters between 1000 and 40 000 a. For the reported study, which aims at the improvement of the method, four aquifers were selected: a sand aquifer in Soulaines (Aube, France), a sand aquifer in Mol (Belgium), a granitic aquifer in Peny (Limousin, France) and the chalk aquifer of the Paris Basin, in Chalon-en-Champagne (France). Humic and fulvic acids were sampled by adsorption on resins: DEAE for in situ sampling and XAD-8 for extractions in the laboratory.
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