Organic Carbon Input in Shallow Groundwater at ?SP?, Southeastern Sweden

by B. Wallin, Stockholm Univ, Stockholm, Sweden,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993

Abstract:

The variation in carbon and oxygen isotopes in calcite fissure fillings and dissolved carbonate from shallow groundwaters has been examined at Aspo, southeastern Sweden. The shallow water lens is refilled by meteoric water and is considered as an open system. The ?¹³C-signatures of the dissolved carbonate fall within a narrow range of -15.8 -17.4 per mil, indicative of organic an organic carbon source. The low ?¹³ C-values suggest that input of soil-CO₂ is the dominating carbon source for the system. ?¹³C and ?¹⁸O-values in the calcite fissure fillings show a wide range in values with a possible two end-member mixing of early post glacial atmospheric CO₂ dominated system to a present day soil-CO₂dominating carbon source.

Subject Headings: Carbon fibers | Groundwater | Carbonation | Radioactive wastes | Dissolved solids | Cracking | Waste disposal | Sweden | Europe

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