The sorption of alkaline earth metals on biotite

摘要

The sorption of alkaline earth cations Ca~(2+), Sr~(2+), Ba~(2+), and Ra~(2+) was investigated on Na-converted biotite, the main sorbing mineral in granitic bedrock at the nuclear waste disposal site in Olkiluoto, Finland. Batch sorption experiments were conducted under CO2-free conditions by varying the concentration of the alkaline earth cation (Ca~(2+), Sr~(2+) and Ba~(2+) 10~(-8) M-10~(-2) M; Ra~(2+) 10~(-10) M-10~(-7) M) in 0.01 M, 0.1 M and 1.0 M NaCIO_4 solutions buffered to pH 8. Additional experiments were conducted on four Olkiluoto bedrock reference groundwater solutions.