Polybrominated diphenyl ethers and alternative flame retardants in house dust in Denmark – levels, patterns and changes over time

Katrin Vorkamp, Marie Frederiksen, Jesper Bo Nielsen, Lars Schiøtt Sørensen, Lisbeth E. Knudsen

Research output: Contribution to journalConference abstract in journalResearch

Abstract

House dust has been recognized as a source of exposure to polybrominated diphenyl ethers (PBDEs), in particular for children [1]. Since the EU ban of the commercial PBDE Penta- and OctaBDE mixtures in 2004 and the regulation of DecaBDE through the EU Restriction of Hazardous Substances (RoHS) Directive, replacements might have been in use [2]. Building on our previous results on PBDEs in house dust from Denmark and associations with perinatal exposure [3], the present study addresses i) PBDE levels in dust sampled in 2014 in comparison with 2007, ii) the occurrence of novel flame retardants (NFRs) in samples from both years. The NFRs studied here included bis(2-ethylhexyl)tetrabromophthalate (BEH-TEBP), 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EH-TBB), 1,2-bis(2,4,6-tribromophenoxy)-ethane (BTBPE), decabromodiphenyl ethane (DBDPE), 2,3-dibromopropyl-2,4,6-tribromophenyl ether (TBP-DBPE) and dechlorane plus (DDC-CO). Furthermore, hexabromocyclododecane (HBCD) was included although globally banned since 2013. While TBP-DBPE was below detection limits in several dust samples, the remaining NFRs were detected in all samples from 2007 and 2014. DDC-CO had relatively low concentrations (median < 5 ng/g for each of the isomers). HBCD had the highest concentration (median of 200 ng/g, predominated by g-HBCD), followed by DBDPE > BEH-TEBP > BTBPE ~ EH-TBB, based on median values. None of these median concentrations reached the median value of BDE-209 of 432 ng/g obtained in 2007 [3]. As previously observed for PBDEs, distributions were skewed with arithmetic means clearly higher than medians, suggesting that exposure might be much above average for certain individuals. Likewise, the NFR composition in dust varied, with individual dust samples containing more BEHT-TEBP or BTBPE than DBDPE. The large variation in the data prevents 2007 and 2014 data from being significantly different, but there are indications of higher concentrations of DBDPE, BEH-TEBP and EH-TBB in 2014 than in 2007. While BDE-209 remained unchanged from 2007 to 2014, BDE-47 appeared lower in the 2014 samples. Similar developments have been reported from the USA [4]. BDE-209 and DBDPE were found to be correlated in the dust samples, which might reflect similar use patterns. Future work will focus on the significance of the occurrence of these compounds in dust for questions of human exposure. [
Original languageEnglish
JournalScientific Research Abstracts
Volume5
Pages (from-to)157-157
Number of pages1
ISSN2464-9147
Publication statusPublished - 2016
EventDUST2016: 2nd International Conference on Atmospheric Dust - Nova Yardinia, Taranta, Italy
Duration: 12 Jun 201617 Jun 2016
http://www.scientevents.com/dust2016/

Conference

ConferenceDUST2016
LocationNova Yardinia
CountryItaly
CityTaranta
Period12/06/201617/06/2016
Internet address

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  • DUST2016

    Marie Frederiksen (Participant)

    12 Jun 201617 Jun 2016

    Activity: Attending an eventConference organisation or participation

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