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<br />dependent on soils redox status. Additionally, high calcium <br />carbonate or magnesium carbonates in the refuse material may <br />provide enough buffering capacity to prevent acid formation. <br />Bicarbonate is one of the major biproducts in the weathering <br />of carbonaceous material (Caruccio, 1978). It is produced <br />through the dissolution of calcium carbonate in the presence of <br />carbonic acid. The reaction is as follows: <br />H2O + CO2 = H2COg <br />H2CO3 + CaCO3 = Ca+ + HC03- <br />Bicarbonate ranged from .0021 to .O1 meq/100g for all material <br />tested. Bicarbonate content of topsoil, and refuse material <br />increased with pH. <br />Sulfate is one of the primary products from pyrite oxidation <br />(Wewerka et. al., 1976). The reaction is as follows: <br />FeS + 02 + H2O = Fe ++ + SOq+ + H+ <br />Sulfate was negatively correlated to pH and positively correlated <br />with age of the refuse material. This again strengthens the <br />observations that pyrite oxidation and/or some other oxidative <br />processes are occurring in the refuse material which causes a <br /> <br />2-10 <br />