Table 3 Typical Ca, Mg, K, and Na concentration values in a sample of Gran Sasso (GS) groundwater (column 2), theoretical values after pre-concentration without separation (column 3), Ca and Mg signals in GS groundwater (column 4), after elution procedure (column 5), after evaporation (column 7), and the relevant separation efficiencies (column 6)
Isotope | GS (μg g−1) | GSAPCWS(x) (μg g−1) | GS (s−1) | After proc. (s−1) | Sep. eff. (%) | After evap. (s−1) |
|---|---|---|---|---|---|---|
Ca | 18 | 1000 | 46 · 106 | 0.26 · 106 | 99.4 | 10.4 · 106 |
Mg | 9.4 | 500 | 860 · 106 | 1.63 · 106 | 99.8 | 65.2 · 106 |
Na | 0.9 | 50 | ||||
K | 0.2 | 10 | ||||
Isotope | S1 | S2 | S3 | S4 | S5 | S6 |
Ca (μg g−1) | 1 | 2 | 5 | 10 | 20 | 0 |
Mg (μg g−1) | 0.25 | 0.5 | 1.25 | 2.5 | 5 | 0 |
Ra (s−1) | 93(2) | 93(1) | 96(3) | 97(1) | 95(1) | 85(2) |