Temporal trends of polychlorinated dibenzo-p-dioxins and dibenzofurans and dioxin-like polychlorinated biphenyls in mothers' milk from Sweden, 1972-2011
2013 (English)In: Environment International, ISSN 0160-4120, E-ISSN 1873-6750, Vol. 60, 224-231 p.Article in journal (Refereed) Published
Temporal trends of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (DL-PCBs) in mothers' milk are still quite rare. Data are particularly scarce when it comes to concentrations from the last decade, 2000 and onwards. The aims of the present study were to assess temporal trends of PCDD, PCDF and DL-PCB in mothers' milk from Stockholm, 1972-2011 and to compare the results with previous analysis of some of the older samples. The samples were analyzed by high resolution GC/MS and results were statistically evaluated for the periods, 1972-2011 and 2002-2011. The rate of which Sigma PCDDs, Sigma DL-PCBs and the Sigma TEQ are decreasing (on pg/g fat WHO-TEQ2005) is higher in the last decade compared to the 40 year period, 1972-2011. A similar trend is indicated, but not confirmed, for Sigma TEQ of PCDFs, probably due to too many PCDF congeners below LOQ in the period 2002-2011. Concentrations of Sigma PCDDs, PCDFs, Sigma DLPCBs and Sigma TEQ all expressed as pg/g fat on TEQ-WH02005-basis, show a statistically significant decline over time, 5.8-6.8% per year, 1972-2011. The last ten years the annual declines for Sigma PCDDs, Sigma DL-PCBs and Sigma TEQ are 92-11% and for Sigma PCDF, 5.4%. Congener specific trend analysis, 2002-2001, of PCDDs and DL-PCBs showed the same pattern, while the PCDF congeners showed no such general trend. The results from the re-analysis showed good agreement with slightly lower Sigma TEQ1998 pg/g fat concentrations in six out of seven samples and mean difference of 13% in Sigma TEQ1998. The study shows that time series can be elongated from previous studies, as long as the sample population remains the same.
Place, publisher, year, edition, pages
2013. Vol. 60, 224-231 p.
Mothers milk, Dioxin, PCDD, PCDF, dioxin-like PCB, Time series
IdentifiersURN: urn:nbn:se:su:diva-98318DOI: 10.1016/j.envint.2013.08.019ISI: 000327566900026OAI: oai:DiVA.org:su-98318DiVA: diva2:683409