Abstract
Abstract Complete dissolution of the coal sample has been achieved using an integrated approach based on oxidative pyrolysis (OP) and microwave-assisted digestion (MWD) for the quantitative determination of major to ultra-trace elements by inductively coupled plasma (ICP)-based techniques. The coal samples were initially pyrolysed by heating to ∼500 °C in the presence of an oxygen stream. Subsequently MWD was applied to the pyrolysed coal residue with an acid mixture of 8 mL of 20%HNO 3 + 5%HF + 5%H 2 O 2 or 20%HNO 3 + 0.4%NH 4 HF 2 + 5%H 2 O 2 . Analysis was carried out by ICP-MS (Be, V, Cr, Mn, Co, Ni, Cu, Zn, As, Rb, Sr, Mo, Cd, Sb, Cs, Ba, W, Tl, Pb, Th, U and REEs) and ICP-OES (Na, K, Ca, Mg, Fe, Al, Sc, Ti). Critical experimental parameters related to OP and MWD were optimized through the analysis of two standard reference materials (SRMs) NIST-1632d and NIST-2685b. Studies with NH 4 HF 2 have demonstrated that it can be used as a replacement to the highly toxic HF for achieving quantitative recovery (>95%) of most of the elements studied here. The optimized method was subsequently applied to Indian coal samples collected from different coal mines.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.