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This paper presents the extraction of major and trace elements from a coal   sample, in deionized water, by using three different extraction techniques.   Rotary mixing and ultrasonic extraction were examined for different   extraction times, while the microwave assisted extraction was performed at   different temperatures. Metal concentrations (Na, K, Ca, Mg, Al, Fe, Mn, Be,   Cd, Co, Cr, Hg, As, Ni, Se, Sb and Pb) in a solution were determined by   employing the inductively coupled plasma atomic emission spectrometry;   whereas the results obtained for Na, K, Ca and Mg were compared employing ion   chromatography. Comparing the rotary and ultrasonic-assisted extraction it is   shown that the former is more efficient for the determination of Fe, Na and   Pb, whereas the latter one has proven more efficient for the determination of   Co and Cr ions. Microwave-assisted extraction has proven the most efficient   method for any elements tested in coal. In addition, sequential extraction of   elements was done using microwave digestion. The results of sequential   extraction experiments indicated associations of investigated elements with a   mineral phase and organic matrix. Sequential extraction provided information   on possible leaching of As, Cd, Co, Cr, Ni, Pb, Fe and Mn in environmental   conditions. [Projekat Ministarstva nauke Republike Srbije, br. 172030

Investigation of different extraction procedures for the determination of major and trace elements in coal by ICP-AES and ion chromatography