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5. EPA (Office of Solid Waste and Emergency Response, US Environmental Protection Agency, Washington, DC), 1996. Method 3050B. Acid Digestion of Sediments, Sludges, and Soils. Revision 2. Test Methods for Evaluating Solid Wastes: Physical/Chemical Methods, EPA SW-846, third ed., vol. I, Sec. A (Inorganic Analytes), pp. 3050B-1–3050B-12 (Chapter 3).