Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Readily biodegradability:

The substance is considered not readily biodegradable since 1% degraded within 28 days. The toxicity control showed that the test item SymWhite 377 can be identified as non toxic in a ready biodegradability test.

Partition coefficient:

The calculated logPow is approx. 2.11. According to ECHA guidance on information requirements and chemical safety assessment - chapter R.11: PBT assessment, May 2008), “for organic substances with a log Kow value below 4.5 it is assumed that the affinity for the lipids of an organism is insufficient to exceed the B criterion, i.e. a BCF value of 2000 L/kg (based on wet weight of the organism, which refers to fish in most cases).” Thus, it can be assumed that the BCF of SymWhite 377 is lower than 2000 L/kg which indicates that neither the B nor the vB criterion is fulfilled. For further information please refer to the CSR - PBT, vPvB assessment.

Hydrolysis:

The substance does not undergo hydrolysis at 50 °C at pH 4 and 7 but was subject to slight hydrolysis at pH 9 in the preliminary test. In the advanced test, the degradation of the test item at pH 9 was < 10 % for 20 °C and
> 10 % for 30 and 50 °C (29 % and 93 %, respectively). With regard to the guideline on hydrolysis the results indicated a half life of > 1 year for the SymWhite® 377 at pH 4 and pH 7 (25 °C). At pH 9 a half life of 2613 hours resulted from hydrolysis at 25 °C.

Adsorption/Desorption screening:

According to the McCall classification scheme of soil mobility potential SymWhite 377 is classified as highly mobile in soil (log Koc= 1.96) (OECD 121).

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