HTC-15 - Abstract

Abstract Title: Dioxin, PCB, PBDE and PFAA concentrations in Baltic salmon during the 2000's
Abstract Type: Poster
Session Choice: Food/Drink
Presenter Name: Dr Jani Koponen
Co-authors:Dr Paivi Ruokojarvi
Prof Hannu Kiviranta
Dr Jaakko Mannio
Dr Pekka Vuorinen
Dr Marika Jestoi
Company/Organisation: National Institute for Health and Welfare (THL)
Country: Finland

Abstract Information :

In the past monitoring programs, the levels of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) and polychlorinated biphenyls (PCBs) in the big Baltic herring (Clupea harengus membras) and salmon (Salmo salar) have exceeded the established maximum levels set by the European Commission for food. The present project was launched in 2016 to gain up to date information on the levels of PCDD/Fs, PCBs, polybrominated diphenylethers (PBDEs) and perfluoro alkyl acids (PFAAs) in Baltic fish. This paper reports the results of the environmental contaminants of Baltic salmon species sampled from different locations in the Baltic Sea area. PCDD/Fs, PCBs, PBDEs and PFAAs were analysed from pooled, freeze-dried fish samples according to an accredited method (T077, accreditation by FINAS according to EN ISO/IEC 17025). Both the isotope dilution/GC-HRMS (Peltonen H. et al., Chemosphere, 2014) and LCESI- MS/MS (Koponen et al., J Chrom A, 2013) were applied for the instrumental analysis.

According to our results, six out of eight salmon samples exceeded the EU maximum level for PCDD/Fs (3.5 pg TEQ/g fw) and all samples exceeded the maximum level for the sum of PCDD/Fs and PCBs (6.5 pg TEQ/g fw). The non-dioxin-like PCBs (indicator-PCBs), did not exceed the EU maximum level (75 ng/g fw). The PCDD/F and PCB concentrations in Baltic salmon decreased considerably from the levels of 2002 and 2009 (Figure 1). The decrease in PCDD/Fs and PCBs in salmon varied between different sampling locations from 54% and 57% from 2002 to 2016 and between 0% and 39% from 2009 to 2016. The overall decrease in the total TEQ concentration from all sampling sites was 58% during 2002 -2016, and 21% during 2009 -2016.

The levels of PBDEs slightly decreased, whereas a slight increase in the concentration of perfluoro-octane sulfonate (PFOS, the main PFAA homologue) was observed between 2009 and 2016. The PBDEs including BDE-209 and PFAAs were not analyzed in 2002 samples. So far, no maximum levels have been set for PBDEs or PFAAs in food by EU.