Ключевые слова:
Solid fuels, Recycling, Fuels, Energy sources, Biofuels, Chemical analysis and testing, Trace element analysis, Determination of content, Arsenic, Barium, Beryllium, Cadmium, Cobalt, Chromium, Copper, Mercury, Molybdenum, Manganese, Nickel, Lead, Antimony, Selenium, Thallium, Vanadium, Zinc, Specimen preparation, Test specimens