Underground renewal time and mixing of the main mineral waters of Tunisia: A multi-tracer study

作者：Jean Baptiste P^*; Fourre E; Gaubi E; Minster B; Aquilina L; Labasque T; Michelot J L; Massault M; Ben Mammou A

来源：Applied Geochemistry, 2017, 85: 10-18.

DOI：10.1016/j.apgeochem.2017.08.006

• Groundwater
• Environmental tracers
• Renewal time
• Groundwater dating

Bottled waters are increasingly popular in Tunisia. Most of them come from groundwaters, thus raising the question of the long-term availability of the mineral groundwater resources. Water collected from production springs or wells of eleven mineral waters of Tunisia among the main commercial brands were analyzed for tritium (H-3), helium-3, SF6, CFCs and carbon-14. Tracer-tracer plots indicate that all of the groundwaters of our data set are a mixture of modern rainwater with older groundwater flow waters that are beyond the time-scale of the transient tracers. C-14 data suggest that the age of these old waters, which constitute the main water reservoir, is of the order of radiocarbon half-life or more. Most of the studied sites have groundwater renewal times in the range 50-150 years. For the sites where tracer concentrations are the most diluted by old waters, this value logically increase to several centuries.

• 出版日期2017-10
• 单位中国地震局