TY JOUR TI INVESTIGATION OF THE POSSIBILITY OF IDENTIFYING THERMALLY MODIFIED PETROLEUM PRODUCTS BY ATOMIC EMISSION SPECTRAL ANALYSIS KW thermally modified petroleum products KW identification of petroleum products KW combustion accelerators KW fire-technical examination KW temporary degradation KW biological transformation JO Problems of risk management in the technosphere AU Ivakhnyuk, S.G. PY 2023 IS 2023 PB Saint-Petersburg University of State Fire Service of Emercom of Russia