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References <br />Hageman, P. L. (2007). "U.S. Geological Survey field leach test for assessing water reactivity and leaching <br />potential of mine wastes, soils, and other geologic and environmental materials.." U.S.Geolosical Survey <br />Techniques and Methods book 5(chap. D3). <br />United States Environmental Protection Agency (1996), Method 3052 Microwave Assisted Acid Digestion <br />of Siliceous and Organically Based Matricies: 1-20. <br />United States Environmental Protection Agency (1996). Method 3060A Alkaline Digestion for <br />Hexavalent Chromium: 1-15. <br />United States Environmental Protection Agency (2007)_ Method 6020A Inductively Coupled Plasma - <br />Mass Spectrometry: 1.30. <br />