2,2'-(octadecylimino)bisethanol

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.684 µg/L

Assessment factor:

50

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.87 µg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.068 µg/L

Assessment factor:

500

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

3.5 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

1.692 mg/kg sediment dw

Assessment factor:

1

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.169 mg/kg sediment dw

Assessment factor:

1

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

5 mg/kg soil dw

Assessment factor:

100

Extrapolation method:

assessment factor

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

PNEC oral

PNEC value:

7.77 mg/kg food

Assessment factor:

90

Additional information

All endpoints are based on measured data applying assessment factors, with PNEC sediment calculated using the equilibrium partition coefficient method.

The PNEC_{aquatic bulk} is calculated using the assessment factor proposed by the TGD. As long-term NOECs from species representing two trophic levels are available (algae and daphnia) an assessment factor of 50 may be used. Based on the observed comparable or lower toxicity to fish for primary fatty amine ethoxylates it is considered unlikely that fish toxicity will be critical for primary fatty amine ethoxylates. Hence any additional toxicity testing with fish will not add scientific value to the ecotoxicity profile of the primary fatty amine ethoxylates other than for obtaining a lower assessment factor. It is therefore concluded that for scientific reasons and in accordance to REACH legislation further testing on fish has to be avoided for reasons of animal welfare. This means that it is proposed to waive the long term fish unless a further refinement of the effect assessment is considered necessary based on the outcome of the chemical safety assessment. For primary fatty amine ethoxylates a safety factor of 50 is applied for the derivation of the PNEC_{aquatic, bulk}

Conclusion on classification

Ecotoxicity

Due to intrinsic properties of amine containing cationic surfactants river water ecotoxicity tests deliver more reproducible test results with limited uncertainty. As river water has a mitigating effect on ecotoxicity due to sorption of the amines toand suspended matter a factor of 10 should be applied to the L(E)C₅₀to correct for the lower ecotoxicity observed.

Table Available algae, daphnia and fish test results (Klimisch 1, 2 and 4)

 

Primary fatty amines ethoxylates	CAS number	96 h Fish LC50 (µg/L)	72 h algae ERC50(µg/L)	72 h algae ERC10/ NOEC (µg/L)	48 h daphnia EC50 (µg/L)	21 d daphnia EC50 (µg/L)	21 d daphnia EC10/ NOEC (µg/L)	EC50corr(µg/L) (corrected for Classification with Factor 10)	EC10corr(µg/L) (corrected for Classification with Factor 10)
2,2'-(C16-18 (evennumbered) alkyl imino) diethanol	1218787-30-4		40	34.5		566	320	40	3.45

Figures given in bold are based on read across; figures given in italic and underlined are performed in reconstituted lab water and these are therefore not corrected.

Biodegradability

The primary fatty amine ethoxylates are readily biodegradable

 

Bioaccumulation potential

No measured BCF fish is available for the primary fatty amine ethoxylates. Standard OECD 305 tests are technically very complicated with these strongly sorbing easily biodegradable substances. Three valid measured log Kow values are however available as presented in the table below.

primary fatty amines ethoxylates	CAS number	Measured Log Kow
2,2'-(C12-18 evennumbered alkyl imino) diethanol	71786-60-2	0.7
2,2'-(C16-18 (evennumbered) alkyl imino) diethanol	1218787-30-4	3.6
2,2’(octadec-9-enylimino)-bisethanol	25307-17-9	3.4

 

The highest log Kow is observed for 2,2'-(C16-18 (evennumbered) alkyl imino) diethanol (CAS no 1218787-30-4). For this product has also the lowest CMC of 3.5 mg/L was observed. The measured log Kow value of 3.6 indicates a moderate bioaccumulation potential for narcotic substances. For polar narcotics like the primary fatty amine ethoxylates however there is only limited information on the relationship between log Kow and BCF. The observed rapid biotransformation of the C₁₂ to C₁₈ alkyldiethanol amines demonstrates that it will be very unlikely that these substances will accumulate in fish. This was confirmed by the calculated BCF values which were all below the CLP threshold value of 500 L/kg.

With a log Kow of 3.6 the BCFBAF model predicts a BCF of 110 L/kg wwt without metabolism and 14.7 L/kg wwt with metabolism.

Classification according(Classification, Labeling & Packaging Directive 1272/2008/EC)

As all acute ecotoxicity values (corrected and uncorrected) as given in the first table are below 1 mg/L the substances should be classified as acute aquatic hazard category 1. Primary fatty amine ethoxylates are all ‘readily biodegradable’ and have a measured log Kow < 4. Based on long-term studies a classification for chronic aquatic toxicity is warranted according to 2nd ATP to CLP. This leads to the following environmental classification accordingfor n-Primary alkyl amines ethoxylates

Acute (short-term) aquatic hazard category 1

M factor 10

Chronic aquatic hazard category 1

M factor 1

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