Agricultural & Natural Resources Development Home Page | Land Reclamation Home Page | Effect of Digestion Method, Siderite Content, and Fizz Rating on Neutralization Potential of Overburden Samples
Table 12. Acid-base account values (metric
tons per 1000 metric tons) for 13 overburden samples compared to
leachate pH and cumulative alkalinity (summed mg/l after each
cycle) after 6 soxhlet cycles. Positive ABA values indicate an
excess of NP suggesting the pH and alkalinity of the sample's
leachate should be alkaline. If the ABA value is negative, the
values represent a deficiency in NP and the leachate should be
acidic. 
| Acid-base Account Values | ||||||||
| Sample | SobekHand | BOILHand | SobekAuto | H2O2Hand | H2O2Auto | SobPerHand | SoxhletpH | CumulativeAlkalinity |
| metric tons CaCO3 equivalent per 1000 metric tons mg/l | ||||||||
| Fe | ||||||||
| 1 | 67 | 86 | 8 | 13 | 4 | 17 | 8.8 | 583 |
| 2 | 59 | 87 | 12 | 16 | 6 | 18 | 8.2 | 606 |
| 3 | 57 | 81 | 5 | 11 | 4 | 9 | 8.0 | 601 |
| 4 | 461 | 791 | -8 | -1 | -4 | -11 | 4.8 | -396 |
| 5 | -77 | -59 | 1471 | -85 | -2 | -116 | 4.8 | -7,807 |
| Ca | ||||||||
| 1 | 923 | 933 | 923 | 921 | 925 | 923 | 9.3 | 1,584 |
| 3 | 708 | 721 | 707 | 725 | 705 | 708 | 9.5 | 2,591 |
| S | ||||||||
| 3 | -202 | -202 | -264 | -248 | -265 | --- | 2.3 | -30,360 |
| 5 | -61 | -61 | -70 | -66 | -72 | --- | 2.4 | -7,233 |
| Si | ||||||||
| 11 | 37 | 70 | 10 | 17 | 12 | 9 | 9.0 | 905 |
| 15 | -8 | 91 | -6 | -7 | -6 | -27 | 2.3 | -1,784 |
| 16 | 14 | 59 | 8 | 20 | 9 | 7 | 8.8 | 828 |
| 17 | 79 | 79 | 11 | 17 | 10 | --- | 8.4 | 519 |
1Indicate incorrect ABA predictions based on water quality for leaching test.
