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Neutralization potential determination of siderite (FeCO3) using selected oxidants
E B Haney1, R L Haney, L R Hossner
1Railroad Commission of Texas, Surface Mining and Reclamation Division, P.O. Box 12967 Austin, TX 78711-2967, USA.
Oxidation treatments, particularly with O2, improve the accuracy of neutralization potential (NP) testing for siderite in coal overburden. This method better reflects natural weathering and provides reproducible results for acid neutralization assessment.
Area of Science:
- Environmental Science
- Geochemistry
- Analytical Chemistry
Background:
- Siderite (FeCO3) in coal overburden interferes with neutralization potential (NP) testing.
- Acidic conditions cause siderite to neutralize acid, inflating NP values.
- Siderite weathering produces neutral to acidic solutions, complicating NP assessment.
Purpose of the Study:
- To evaluate the impact of oxidation treatments on laboratory NP measurements of siderite.
- To compare the effectiveness of hydrogen peroxide (H2O2), potassium permanganate (KMnO4), and O2 as oxidation agents.
- To determine the most reliable method for assessing NP in siderite-containing overburden.
Main Methods:
- Siderite samples from overburden were subjected to NP testing.
- Oxidation treatments using H2O2, KMnO4, and O2 were applied prior to NP measurement.
- Reaction products were analyzed, and NP values were compared to the standard USEPA method.
- Reproducibility and correlation with manganese concentration were assessed.
Main Results:
- All oxidation treatments reduced NP values compared to the standard method.
- H2O2 yielded variable results; KMnO4 produced non-representative weathering products.
- O2 oxidation resulted in the lowest NP values and products mimicking natural weathering.
- O2 oxidation demonstrated high reproducibility and correlation with manganese concentration.
Conclusions:
- Oxidation with O2 is the most effective method for accurately assessing NP in siderite-containing overburden.
- O2 oxidation provides reproducible results that closely simulate atmospheric weathering conditions.
- Standard NP testing methods may overestimate neutralization capacity when siderite is present.
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