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2. H.M. Kingston, L.B. Jassie, Introduction to Microwave Sample Preparation. Theory and Practice, American Chemical Society, Washington DC, 1988.
3. ASTM 5258-92, Standard practice for acid extraction of elements from sediments using closed vessel microwave heating, The American Society for Testing and Materials, Philadelphia, 1992.
4. SW-846 EPA Method 3050B, Acid digestion of sediments, sludges and soils, in: Test Methods for Evaluating Solid Waste, 3rd Edition, 3rd Update, US Environmental Protection Agency, Washington DC, 1995.