jf061962d_si_001.pdf (28.02 kB)
Experimental Study on the Removal of Dioxins and Coplanar Polychlorinated Biphenyls (PCBs) from Fish Oil
journal contribution
posted on 2006-12-27, 00:00 authored by Ayato Kawashima, Ryouji Iwakiri, Katsuhisa HondaRecently, it has been found that fish oils contain a high proportion of contaminants, namely,
polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and coplanar
polychlorinated biphenyls (cPCBs). In this study, the removal of contaminants from fish oil by
supercritical CO2 extraction (SCE) and by using adsorbents (0.13 wt % of oil) was investigated. Dioxins
and cPCBs were extracted from fish oil by SCE at a temperature of 60 °C and a pressure of 28 MPa,
and the removal efficiencies for PCDDs and PCDFs were in the range of 15−90% and those for
cPCBs were in the range of 70−90%. However, 40% of the oil was extracted simultaneously with
contaminants. On the adsorbent treatment, activated carbon showed high efficiency, and the removal
efficiencies were >90% for PCDDs and PCDFs, but below 30% for cPCBs. A combination of both of
these methods is more effective, and almost 100% of the total toxicity equivalence quantity value
could be reduced.
Keywords: Fish oil; dioxins; supercritical CO2; extraction; activated carbon