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The paper presents geochemical researches of the Westphalian sedimentary rocks from the Lublin Coal Basin (Poland) with the use of various digestion methods. For all samples the concentration of main and trace elements was identified (Co, Mn, Bi, Cu, Zn, Mo, Pb, Ni, Fe, P, Mg, U, Ca, Sr, Zr, K, Rb, Al, V, Ba, Cr, Na, Th, Cd), using inductively coupled plasma mass spectroscopy (ICP-MS) The samples were prepared for testing by means of two different dissolution methods: the method of complete dissolution пїЅ multi-a...