Fractionation of Heavy Metals in Fly Ash from Wood Biomass Using the BCR Sequential Extraction Procedure Jukić, M.; Ćurković, L.; Šabarić, J.; Kerolli-Mustafa, M. Bulletin of Environmental Contamination and Toxicology 99(4): 524-529 2017 1432-0800 10.1007/s00128-017-2160-0 https://eurekamag.com/research/059/750/059750781.php