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Agreement between c Soln and c DGT of S and separation of cations (Na, K, and Ca) from the sulfate sampled by DGT (n = 5)
| Standard solution | S concentration/mg L−1 | c DGT/c Soln | Cation concentration/mg L−1 | Cation separation | |
|---|---|---|---|---|---|
| c Soln | c DGT | (M Soln − M El)/M Soln | |||
| Na2SO4 × 10 H2O | 9.3 ± 0.2 | 8.0 ± 1.4 | 86 ± 15 % | 14.3 ± 0.9 | 99 ± 1 % |
| K2SO4 | 8.9 ± 0.1 | 8.4 ± 0.9 | 95 ± 10 % | 23.2 ± 1.1 | 99 ± 0 % |
| CaSO4 × 2 H2O | 9.4 ± 0.2 | 8.9 ± 1.8 | 95 ± 19 % | 11.5 ± 1.0 | 99 ± 1 % |
Values with expanded uncertainties (U, k = 2)
