Registration Dossier

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Administrative data

Endpoint:
bioaccumulation in aquatic species: fish
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference
Reference Type:
publication
Title:
Sorption of cationic surfactants to artificial cell membranes: comparing phospholipid bilayers with monolayer coatings and molecular simulations
Author:
Timmer, N.; Droge, S.T.J
Year:
2017
Bibliographic source:
Environ. Sci. Technol. 2017, 51, 2890-2898; 10.1021/acs.est.6b05662.

Materials and methods

Test guideline
Guideline:
other: Determination of Phospholipid-water partitioning coefficients
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Bioaccumulation factor
Type:
other: log Kplip-w (for C8-tert amine as worst case surrogate)
Value:
ca. 2.35 dimensionless

Applicant's summary and conclusion

Conclusions:
Phospholipid-water partitioning coefficients (kplip-w) can be used to investigate more realistic partitioning behavior of cationic surfactants, like the registration substance, as phospholipid bilayers or membranes have zwitterionic headgroups at the interface. Cations can interact favorably with the phosphate group. Log kplip-w values are published for several amine substances. These values decrease with lower C-chain length of the alkyl chain. Published values for tertiary alkyl-dimethyl-amines are: C8N(CH3)3+: 2.35; C10N(CH3)3+: 3.65; C12N(CH3)3+: 5.30
The value for the C8-tert amine (log Kplip-w=2.35) can be used as a conservative worst case-descriptor for substance distribution including a ionic mechanism as it has a longer alkyl-chain than the registration substance, and the value increases with increasing alkyl-chain-length.