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Variation (min–max) of exchangeable cations in test solution and suspensions (with and without addition of carbon) at the end of the incubation. DL = the lower detection limit
| Experimental units | n | Al (mg l−1) | Ca (mg l−1) | K (mg l−1) | Mg (mg l−1) | Na (mg l−1) |
|---|---|---|---|---|---|---|
| Test solution | 3 | <DL | 70–71 | 56 | 172–174 | 1340–1360 |
| No added carbon | 4 | <DL–0.06 | 71–90 | 46–56 | 170–175 | 1320–1350 |
| Added carbon | 25 | <DL–0.11 | 69–83 | 39–55 | 151–172 | 1320–1500 |
