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Sci Total Environ. 2019 Feb 10;650(Pt 1):193-201. doi: 10.1016/j.scitotenv.2018.08.407. Epub 2018 Aug 29.

Organophosphate esters in house dust: A comparative study between Canada, Turkey and Egypt.

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Department of Chemistry, The American University in Cairo, New Cairo 11835, Egypt. Electronic address:
Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada.
Department of Chemistry, The American University in Cairo, New Cairo 11835, Egypt.
Department of Environmental Engineering, Faculty of Civil Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey.
Faculty of Agriculture, Adnan Menderes University, 09100 Aydin, Turkey.
Department of Environmental Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, 16310 Yildirim/Bursa, Turkey.
Air Quality Processes Research Section, Environment and Climate Change Canada, 6248 Eighth Line, Egbert, ON, Canada.


Organophosphate esters (OPEs) are commonly used as flame retardants (FRs) and plasticizers. The usage of OPEs has increased recently due to the ban of several brominated flame retardants, but information on levels in the environment, including the indoor environment is still limited. We investigated the occurrence and distribution of 12 OPEs in urban house dust from Vancouver, Canada; Istanbul, Turkey; and Cairo, Egypt. The median ∑OPE concentration was 41.4 μg/g in the Vancouver samples while median levels in Istanbul and Cairo were significantly lower. The median composition profiles of OPEs in Vancouver and Cairo were dominated by tris (2-butoxyethyl) phosphate (TBOEP), accounting for 56 and 92% of total OPEs respectively while it showed a detection frequency of only 14% in Istanbul. Tris (2-chloropropyl) phosphate (TCPP) was the most abundant chlorinated OPE representing 20 and 36% of the total OPEs in Vancouver and Istanbul respectively, but was below the detection limit in the Cairo dust samples. Consistent with other studies, ΣOPE concentrations were ~1 to 2 orders of magnitude higher than PBDEs and currently used flame retardants in the same dust samples. The mean estimated daily intakes (EDI) of ΣOPE from dust were 115, 38 and 9 ng/kg/bw/day in Vancouver, Cairo and Istanbul respectively for toddlers where adults were ~10 times lower. The total toddler OPE intake ranged from 115 to 2900, 38 to 845 and from 9 to 240 ng/kg bw/day across the three cities. TBOEP had the largest contribution to the EDI in both toddler and adults, where toddler TBOEP exposures via dust represented 4% to 80%, 2% to 44% and 0.1% to 6% of the Reference Doses (RfD) in the mean and high intake scenarios for toddlers in Vancouver, Cairo and Istanbul respectively.


Exposure; House dust; Organophosphate esters

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