TY - JOUR N2 - The problem of the migration of metal ions in the environment remains a current problem in light of the quality of obtained crops. The necessity of more and more frequent use of alternative sources of biogens in the form of waste substances, poses a threat of loading significant amounts of metals into the soil – including heavy metals harmful to human health and life. The article discusses a significant problem, namely the comparison of the results of the environmental impact of waste, obtained on the basis of legally authorized leaching tests (three-stage leaching test according to PN-EN 12457:2006), with results obtained from sequential chemical extraction (performed in 4-step chemical extraction developed and recommended in European Union countries by Communities Bureau of References – BCR). The study covered an investigation of industry fly ash from the combustion of lignite, in which Cu, Zn, Cd, Ni, Pb, Cr, Na, K, Li concentrations and loads were calculated. A mobility of analyzed elements was established on this basis. From heavy metals, the highest values in fraction I were noted for nickel and copper and zinc as well as nickel were noted for fraction IV . Peaking values of electrolytic conductivity in eluates was created by high concentrations of macroelements (Na and K). These tests confirm that the leaching tests used for their application in the natural environment indicate such concentrations at the highest levels that can be obtained at the first or second stage of sequential chemical extraction, and thus their proper full environmental impact is not known. L1 - http://journals.pan.pl/Content/112134/PDF/rosik-dulewska-i-inni.pdf L2 - http://journals.pan.pl/Content/112134 PY - 2019 IS - No 4 EP - 146 DO - 10.24425/gsm.2019.128539 KW - leaching test KW - lignite ashes KW - heavy metals KW - sequential chemical extraction KW - BCR A1 - Rosik-Dulewska, Czesława A1 - Karwaczyńska, Urszula A1 - Ciesielczuk, Tomasz PB - Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN PB - Instytut Gospodarki Surowcami Mineralnymi i Energią PAN VL - vol. 35 DA - 2019.12.27 T1 - Comparative analysis of the evaluation of the influence of waste on the environment depending on the applied research method (on the example of brown coal ash) SP - 135 UR - http://journals.pan.pl/dlibra/publication/edition/112134 T2 - Gospodarka Surowcami Mineralnymi - Mineral Resources Management ER -