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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

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From all studies and publications assessed so far no consistent findings on accumulation of DP in the food chain can be derived. Bioconcentration studies using fish did not show high levels of bioaccumulation, but their relevance to highly insoluble substances such as Dechlorane Plus is limited. In some freshwater predator/prey sets and also in marine oysters, bioaccumulation was observed that could be considered very bioaccumulative. However, the results mainly reported in peer-reviewed literature did not indicate strong bioaccumulation, or even indicated no accumulation in the food webs investigated and many predator/prey sets. Whenever different flame retardants were assessed by authors it was stated, that bioaccumulation of DP was lower than for example for mirex, polychlorinated biphenyl ethers or Dechlorane 602.

When assessing the most conservative bioaccumulation results found the following findings can be summarized:
BCF: 2907 (Boudreau, 1973 using acetone as vehicle and thus of limited relevance)
Half-lifes in fish: 53.3 days and 40.4 days for the syn- and anti-isomer, respectively (Tomy, 2008, exposure via feeding of rainbow trouts under flow-through conditions).
BMF: 12 and 11 for syn- and anti-DP, respectively (Tomy, 2007 for trout/alewife set in Lake Ontario, whereas other predator/prey sets showed values ≤1)
log BAF: 4.4 (Wu, 2010 for water snake)
BSAF (freshwater sediment): 0.88 (0.33 - 2.8) for syn-DP, and 0.33 (0.086 - 1.0) for anti-DP (Wang, 2012)
BSAF (marine sediment): 4.6, ranging from 1.0 to 7.9 (Jia, 2011)

Thus, some findings do point to very bioaccumulative properties, whereas others show bioaccumulative properties or even no accumulation is some cases according to REACH Annex XIII. A conclusive picture therefore cannot be drawn, but it appears that lipid content of predator species plays a role (predator fish such as trouts do show higher bioaccumulation rates, also having higher lipid contents typically than their preys).

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