Table 6.
The concentration of major elements (ions) in the red mud leachate (mg/L).
| Samples | Al | Ca | Na | Mg | K | Si | Cl− | F− | NO3− | SO42− |
|---|---|---|---|---|---|---|---|---|---|---|
| HN-A-L | 1327.4 | 22.6 | 7634.5 | 8.1 | 1016.0 | 31.8 | 6588.1 | 299.6 | 492.2 | 2386.4 |
| SD-A-L | 745.5 | 57.1 | 10650.0 | 10.5 | 81.8 | 89.9 | 6490.5 | 121.8 | 483.4 | 7453.3 |
| GX-A1-L | 118.3 | 120.6 | 1200.5 | 19.5 | 114.4 | 13.0 | 511.4 | 88.0 | 183.2 | 502.5 |
| GX-B-L | 152.9 | 194.6 | 4707.0 | 29.1 | 197.6 | 26.5 | 6459.8 | 178.6 | 730.7 | 6593.0 |
| GX-A2-L | 1095.5 | 88.9 | 3506.0 | 15.0 | 239.3 | 41.7 | 877.1 | 49.8 | 133.8 | 741.7 |
| Range | 118.3–1327.4 | 22.6–194.6 | 1200.5–10650.0 | 8.1–29.1 | 81.8–1016.0 | 13.8–89.9 | 511.4–6588.1 | 88.0–299.6 | 183.2–730.7 | 502.5–6593.0 |
| USEPA (GW) | 2 | - | - | - | - | - | 250 | 2 | - | 250 |
| China (GW) | 0.2 | - | 200 | - | - | - | 250 | 1 | 20 | 250 |