FIELD: environment protection. SUBSTANCE: decontamination of toxic compounds such as mixture of polychlorobenzenes and polychlorobiphenyls is decontaminated successively treating with oleum or concentrated sulfuric acid at 170- 210 C for 8-18 hours and triethanol amine in equivalent amount to sulfurizing agent. EFFECT: more efficient decontamination process. 3 cl, 1 tbl
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