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Toxicity to microorganisms

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Reference
Endpoint:
activated sludge respiration inhibition testing
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The target substance Fatty acids, tall-oil, reaction products with maleic anhydride and triethylene-tetramine (TOFA-MA-TETA) and the source substance Fatty acids, tall-oil, reaction products with di-ethylenetriamine (DETA), maleic anhydride, tetraethylenepentamine (TEPA) and triethylenetetramine (TETA) are characterised by the same starting materials: the hydrophobic part from fatty acids and the hydrophilic part from the polyethyleneamines.
The source substance is a mixture of ethyleneamines of different lengths (DETA, TETA and TEPA). The target substance contains only one ethyleneamine: TETA.
The source and the target substance show therefore the same reactive groups and a similar composition with the absence of two original ethyleneamines (DETA and TEPA) as biggest difference. A read-across to the source is therefore justified.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
The target substance actually is manufactured from the same starting materials of the source:
Fatty acids, tall-oil and maleic anhydride. TOFA is reacted with maleic anhydride to make a Diels-Alder intermediate which is a tri-acid. This is reacted with the TETA to produce a mixture of amido-amine & oligomeric UVCB constituents. The source substance also contains two other ethyleneamines: di-ethylenetriamine and tetraethylenepentamine.
The source substance has been registered already and the EC50 and NOEC were determined to be greater than the nominal tested concentration of product > 100.0 mg/L
The absence of two amines does not influence the acute toxicity effect on microorganisms of the substance.

3. ANALOGUE APPROACH JUSTIFICATION
The target substance is one of the constituent of the UVCB source substance and thus read-across from the bigger compound Fatty acids, tall-oil, reaction products with diethylenetriamine, maleic anhydride, tetraethylenepentamine and triethylenetetramine to TOFA-MA-TETA is common practice and justified.

4. DATA MATRIX
Whereas the source substance is a Fatty acids, tall-oil, reaction products with di-ethylenetriamine (DETA), maleic anhydride, tetraethylenepentamine (TEPA) and triethylenetetramine (TETA), hence using a mixture of DETA, TETA and TEPA as reactant, the target substance uses pure TETA (triethylenetetramine) instead, being a more purified (narrower cut distillation) form of DETA/TETA/TEPA resulting in a name change of the target substance, being Fatty acids, tall-oil, reaction products with maleic anhydride and triethylenetetramine (TETA).
Reason / purpose for cross-reference:
read-across source
Qualifier:
according to guideline
Guideline:
OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation))
Qualifier:
according to guideline
Guideline:
EU Method C.11 (Biodegradation: Activated Sludge Respiration Inhibition Test)
Duration:
3 h
Dose descriptor:
NOEC
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Duration:
3 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Conclusions:
The EC50 and NOEC were determined to be greater than the nominal tested concentration of product > 100.0 mg/L

Description of key information

The  EC50 and NOEC determined for microorganisms in activated sludge were determined to be greater than the nominal tested concentration of product > 100.0 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
100 mg/L
EC10 or NOEC for microorganisms:
100 mg/L

Additional information