Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Based upon the experimentally-determined octanol-water partition coefficients for SAS, as well as the high molecular weight and polarity of SAS constituents, the potential for bioconcentration and bioaccumulation of SAS in aquatic and benthic species is low. Predicted BCF values provide further support for this conclusion. Therefore, testing is not required for this endpoint.

Key value for chemical safety assessment

Additional information

No bioconcentration or bioaccumulation studies are available for SAS. However, bioconcentration (accumulation in organisms from water) and bioaccumulation (accumulation in organisms from water and diet) are often predicted based upon the octanol-water partition coefficient (Kow or Pow). Two studies were conducted in order to determine the octanol-water partition coefficient, and thus indirectly assess the bioaccumulation potential of SAS. The constituents in the water-soluble fraction of SAS (approximately 75% of the sample) demonstrated measured log Pows of <0, while the constituents in the methanol-soluble fraction of Soltex® (85% SAS) additive demonstrated measured log Pows of <0, 1.1, 3.2, and >6.2. These data show that the majority of the constituents in SAS have measured log Pows of <3, and do not indicate a potential for bioaccumulation. Additional characteristics of SAS arguing against bioaccumulation potential are the high molecular weight and polarity of the components. The TGD (European Commission, 2003) indicates that molecules with a MW greater than 700 g/mol are less likely to be absorbed and to bioconcentrate. The largest fraction of SAS components, resins, have MWs of 800 to 2000, and the other fractions have MWs of 500 to 900 or 1000. Therefore, even fractions of SAS found to be fat soluble would not likely be absorbed due to their high molecular weight.

In addition, the predicted bioconcentration factors (BCFs) from EPIWIN (USEPA, 2009) for representative structures of SAS were approximately 80, which is far below the PBT criteria cutoff for bioaccumulation concern from the Technical Guidance Document, E.C. (2003).

References:

E.C. 2003. Technical Guidance Document on Risk Assessment in support of Commission Directive 93/67/EEC on Risk Assessment for new notified substances, Commission Regulation (EC) N° 1488/94 on Risk Assessment for existing substances, Directive 98/8/EC of the European Parliament and of the Council concerning the placing of biocidal products on the market. Luxembourg, Office for Official Publications of the European Communities.

USEPA. 2010. EPI Suite v. 4.0. United States Environmental Protection Agency. Copyright 2000-2009.