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<br />'~,' COF~E LABOgATOR1ES
<br />Wbetern Alias
<br />International
<br />' .le.lp.~~.,
<br />HUMIDITY CELL TESTS
<br />METHODS (cont.)
<br /> OPERATING SPECIFICATIONS
<br />' Air flow is maintained through each cell at 5 to 8 liters per
<br /> minute during both dry and humidified periods. Hose clamps are
<br /> utilized to aid in equalizing flow rates. During the humidified time
<br />' period (3 days), approximately 110-150 mis of vaporized water pass
<br /> through each cell. Ambient temperatures during testing ran ge from 60°
<br /> to 80° F. Sample material contained in the cell is left undistu rbed
<br />
<br />1 for the duration of the test.
<br /> RESULTS
<br />' All analytical results on leachates generated from each cell are
<br />reported on a standard format. Graphs of pH, cumulative sulfate, and
<br />cumulative acidity versus time are also reported.
<br />' DISCUSSION
<br />t Kinetic tests used to predict acid mine drainage are a relatively
<br />new concept. Humidity cell tests are designed to measure the rate of
<br />oxidation and weathering of various types of materials. operating
<br />' specifications are flexible and can be designed to hest match a
<br />particular environment. Results can also be reported in •s format that
<br />best fits the needs of the project.
<br />' REFERENCES
<br /> Sobek, Andrew A., Shuller'W.A., .Freeman J.R., and Smith, R.M., Field
<br />' And Laboratory Measurements Applicable to Overburden and Minesoil, EPA-
<br /> 600/2-78-054, March 1978, pp. 182-185.
<br />t Ferguson, K.D., Static and Kinetic Methods to Predict Acid Mine
<br /> Drainage, Department of the Environment, Environmental Protection
<br /> Service, Pacific Region, July, 1985. 37 pages.
<br />' Skousen, J.G., Sencindiver, J.C., and Smith, R.M., A Review of
<br /> Procedures for Surface Mining and Reclamation in Areas with Acid-
<br /> Producing Materials, Division of Plant and Soil Sciences, College of
<br />' Agriculture and Forestry, West Virginia University, Morga ntown, West
<br /> Virginia, April, 1987. pp 3-8.
<br />' Williams, R.D., Schuman, G.E., Reclaiming Mine Soils and Overburden in
<br />the Western United States, Analytical Parameters and Procedures, Soil
<br />Conservation Society of America, 1987. pp. 233-258.
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