Table 3.
Results from sequential selective extraction (SSE) of composited IK mine tailings (0–25cm).
| DLa (μmol kg−1) |
Totalb (mmol kg−1) |
DI H2Oc (μmol kg−1) |
NH4NO3c (μmol kg−1) |
AAcc (μmol kg−1) |
NaH2PO4c (μmol kg−1) |
AAOc (μmol kg−1) |
CBDc (μmol kg−1) |
Σ(1–6)δ (μmol kg−1) |
Labilee (%) |
Residualf (%) |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||
| Element | Total | water soluble |
plant available |
acid soluble |
specifically sorbed |
amorphous (oxyhydr)oxides |
crystalline (oxyhydr)oxides |
extractable | unextractable | ||
| Na | 1.74 | 230(10)g | 30(7) | 1670(8)E2 | 19(4)E2 | <DLh | <DL | <DL | 169(1)E3 | 72.5% | 27.5% |
| Mg | 3.29 | 510(21) | 384(4)E2 | 9(1)E2 | 310(70) | 250(20) | 11(1)E2 | 1060(20) | 421(7)E2 | 8.25% | 91.8% |
| Al | 1.48 | 1520(30) | 649(7)E2 | 9(2)E2 | 14(2)E2 | 910(50) | 99(2)E2 | 10300(80) | 88(1)E3 | 5.80% | 94.2% |
| K | 1.02 | 93(1) | 14(2) | 24(3)E2 | 21(1)E2 | 44(4)E2 | 88(2)E2 | 163(2)E2 | 34(1)E3 | 36.4% | 63.6% |
| Ca | 9.98 | 1240(25) | 43(3)E4 | 37(4)E4 | 37(4)E2 | 13(1)E2 | 76(4)E2 | 7940(70) | 82(6)E4 | 66.0% | 34.0% |
| Ti | 0.0418 | 107(2) | 4.3(4) | 5.9(6) | 7(1) | <DL | <DL | <DL | 17(2) | 0.02% | 99.8% |
| Mn | 0.0364 | 6.5(8) | 1770(80) | 100(9) | 30(4) | 49(4) | 1010(20) | 1270(60) | 42(2)E2 | 64.5% | 35.5% |
| Fe | 0.716 | 2020(80) | 43(2)E3 | 280(60) | 17(1)E3 | 20(1)E3 | 548(6)E3 | 94(1)E4 | 157(2)E4 | 77.6% | 22.4% |
Detection limit (nmol kg−1) based on ICP-MS instrument detection limit and dilution factors used.
Total (mmol kg−1) composition determined by lithium borohydrite fusion followed by with ICP-MS/OES detection.
See details in Table 1.
Sum of extraction steps 1–6, represents the labile fraction.
Labile is the extractable percentage liberated in the SSE scheme;
Residual is the unextracted totals from the difference between the SSE steps 1–6 and the total;
Values in parenthesis are ± standard deviation of replicate measurements in scientific notation, where necessary (e.g., 230(10) = 230 ± 10 and 1670(8)E2 = 167000 ± 800).
<DL indicates less than the detection limit, i.e. the result was not quantifiable as significantly different from the calibration blank and where reported for Ti the result was not distinguishable from the reagent blank.