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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Taking all information into account the substance is expected to show low potential for bioaccumulation.

Key value for chemical safety assessment

Additional information

No experimental data on bioaccumulation are available. The high log Kow of 6.62 - 7.64 (KOWWIN v1.68) as an intrinsic chemical property of the substance might indicate a potential for bioaccumulation since it is above the trigger value set out in Annex IX, column 2 of Regulation (EC) No 1907/2006. However, this value might over- or under-estimate the bioaccumulation potential since the environmental fate in regard to biodegradation and metabolism and excretion of the substance are not reflected by the log Kow itself. The gathered information from QSAR-estimation in combination with data on environmental behaviour and excretion provide enough evidence (in accordance to the Regulation (EC) No 1907/2006, Annex XI General rules for adaptation of the standard testing regime set out in Annexes VII to X, 1.2.), to cover the data requirements of Regulation (EC) No 1907/2006, Annex IX to state that the substance is likely to show low bioaccumulation potential.

Due to ready biodegradability and considerable potential of adsorption, the substance can be effectively removed in conventional sewage treatment plants (STPs) by biodegradation and by sorption to biomass (ECHA, 2012). If released into the aquatic environment, Reaction products of oleoyl sarcosine with sodium hydroxide undergoes extensive biodegradation and sorption on organic matter. Thus, the bioavailability of the substance to aquatic organisms in the water column is reduced rapidly. The relevant route of uptake of the substance in aquatic organisms is considered predominantly by ingestion of particle bound substance. 

Should the substance be taken up by fish it is not expected to be rapidly metabolized via enzymatic hydrolysis to the corresponding hydrolysis products. However, mammalian data (rats) available for one of the category members showed that after oral administration of [14C]Sodium Lauroyl Sarcosinate, 82 - 89% was excreted after 24 h in the urine and faeces (CIR, 2001), clearly indicating the capacity of mammal depuration systems to rapidly eliminate the substance from the body. Moreover, frequent oral application to rats did not cause accumulation of radiolabelled [14C]Sodium Lauroyl Sarcosinate in bone and in muscle tissue (Allison, 1994). These two studies provide strong evidence of the expected low bioaccumulation potential of the Sarcosine category members. A validated (Q)SAR model (BCFBAF v3.01) resulted in BCF values of 211.7 - 1509 L/kg for representative components based on Arnot-Gobas model (upper trophic). This value is clearly below 2000 L/kg to be classified as bioaccumulative or very bioaccumulative (Annex XIII criterion for Bioaccumulative (B) substances, Regulation (EC) No 1907/2006)).

In conclusion the log Kow of 6.62 - 7.64 overestimates the true potential for bioaccumulation. Only low concentrations are expected to be found in the aquatic environment. After uptake, fast excretion and direct elimination is expected based on mammalian data reducing the bioaccumulation potential. BCF/BAF values estimated with the BCFBAF v3.01 program also indicate that the substance will not be bioaccumulative (all well below 2000 L/kg (Annex XIII criterion for Bioaccumulative (B) substances, Regulation (EC) No 1907/2006)). Taking all these information into account, it can be concluded that the bioaccumulation potential of Reaction products of oleoyl sarcosine with sodium hydroxide is expected to be low.

References

Allison JB et al. (1994). The distribution of C14 from compound 105 in the rat. Hampshire Chemical Corporation. 3: 58-66.

ECHA (2012). Guidance on information requirements and chemical safety assessment, Chapter R.7b: Endpoint specific guidance.

CIR (2001). Final Report on the Safety Assessment of Cocoyl Sarcosine, Lauroyl Sarcosine, Myristoyl Sarcosine, Oleoyl Sarcosine, Stearoyl Sarcosine, Sodium Cocoyl Sarcosinate, Sodium Lauroyl Sarcosinate, Sodium Myristoyl Sarcosinate, Ammonium Cocoyl Sarcosinate, and Ammonium Lauroyl Sarcosinate” (see IJT, 10 (Suppl.): 1-14, 2001)

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