Research Article
Exchange Characteristics of Lead, Zinc, and Cadmium in Selected Tropical Soils
Table 3
Selectivity coefficient,
, as a function of soil phase composition in Ca
2+→M
2+ exchange at 30°C and 60°C in the different soils studied.
(a) Selectivity coefficient, , for soil AD2 |
| AD2 | | | | | | |
| 30°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.30 | 33.05 | 0.43 | 5.54 | 0.46 | 0.67 | 0.43 | 50.89 | 0.61 | 14.49 | 0.69 | 1.05 | 0.71 | 19.62 | 0.77 | 10.08 | 0.83 | 1.24 | 0.86 | 10.30 | 0.91 | 4.14 | 0.93 | 1.35 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
| 60°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.32 | 23.06 | 0.42 | 5.72 | 0.46 | 0.65 | 0.42 | 44.26 | 0.57 | 17.88 | 0.68 | 2.03 | 0.73 | 12.84 | 0.76 | 9.60 | 0.83 | 1.67 | 0.87 | 7.20 | 0.91 | 3.77 | 0.92 | 2.21 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
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(b) Selectivity coefficient, , for soil AD3 |
| AD3 | | | | | | |
| 30°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 127.48 | 0.40 | 13.37 | 0.43 | 7.57 | 0.24 | 196.05 | 0.62 | 15.83 | 0.61 | 19.80 | 0.31 | 219.09 | 0.76 | 14.44 | 0.77 | 13.70 | 0.73 | 41.83 | 0.88 | 10.82 | 0.89 | 10.75 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
| 60°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 356.00 | 0.38 | 24.53 | 0.45 | 2.56 | 0.31 | 241.90 | 0.58 | 33.68 | 0.64 | 9.30 | 0.55 | 112.83 | 0.73 | 28.50 | 0.75 | 17.58 | 0.79 | 44.30 | 0.88 | 13.12 | 0.90 | 7.22 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
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(c) Selectivity coefficient, , for soil NB |
| NB | | | | | | |
| 30°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.34 | 24.06 | 0.42 | 6.03 | 0.46 | 0.18 | 0.48 | 39.50 | 0.65 | 7.23 | 0.69 | 0.53 | 0.68 | 24.71 | 0.79 | 7.65 | 0.83 | 1.03 | 0.88 | 8.50 | 0.92 | 2.64 | 0.93 | 1.00 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
| 60°C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.36 | 17.64 | 0.41 | 8.44 | 0.46 | 0.13 | 0.51 | 28.85 | 0.61 | 12.84 | 0.69 | 1.78 | 0.72 | 16.82 | 0.75 | 11.84 | 0.83 | 1.39 | 0.88 | 7.22 | 0.91 | 3.68 | 0.93 | 1.23 | 1.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 |
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