FIELD: analytical methods. SUBSTANCE: as internal standard in quantitative determination of monofluoro-polychlorinated dibenzo-p-dioxins, a polyhalogenated dioxin mixture is used containing 15-70 wt % monofluorotetrachlorodibenzo-p- dioxin, 70-15 wt % monofluoropentachlorodibenzo-p-dioxin, and monofluoroheptachlorodibenzo-p-dioxin to the balance. For determining tetrachlorodibenzo-p-dioxins, 2-fluoro-6,7,8,9-tetrachlorodibenzo-p- dioxin and, for determining hexa- and heptachlorodibenzo-p-dioxins, 2- fluoro-1,3,4,6,7,8,9-heptachlorodibenzo-p-dioxin are utilized. EFFECT: improved reliability of analysis. 4 cl, 3 tbl
