As shown in
Table 3 and Figure 1, octachlorodibenzo-p-dioxin (OCDD)
was the most abundant congener of PCDD/Fs in all samples,
which took up 60−70% of the total PCDD/Fs. Generally,
concentrations decreased in the following order: OCDD >
heptachlorodibenzo-p-dioxins (HpCDDs) > hexachlorodibenzo-
p-dioxins (HxCDDs) > pentachlorodibenzo-p-dioxins
(PeCDDs) > tetrachlorodibenzo-p-dioxins (TeCDDs).