Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Di-tridecylamine, branched and linear (CAS 101012-97-9) is a mixture of (predominantly) di-alkyl amines with varying alkyl-chain length in a range between C13 and C29.The main fraction consists of isomers of di-tridecylamines (C26H55N). Secondary fractions were detected to have chain lenghts from C11 to C15. The following structures and relative fractions were proposed:

Isomers of C13H29N (mono alkyl amine): 0.2%

Isomers of C23H49-N: 0.4%

Isomers of C24H51-N: 4.4%

Isomers of C25H53-N: 8.7%

Isomers of C26H55-N: 81.2%

Isomers of C27H57-N: 3.5%

Isomers of C28H59-N: 1.3%

Isomers of C29H61-N: 0.2%

The main fraction with an amount of > 80% are isomers of C26H55N. For this fraction, di-iso-tridecylamine (CAS 57157 -80 -9) was selected as representative substance. The assessment of ecotoxicology is predominantly focussed on this molecule, especially in cases of calculations and non-BASF studies.

Short-term toxicity to fish:

Acutely not harmful to fish (96 -h LL50 > 100 mg/L based on loading rate)

Short-term toxicity to aquatic invertebrates:

Acutely harmful to aquatic invertebrates (48 -h EL50 = 46.9 mg/L based on loading rate)

Growth inhibition to aquatic algae:

Acutely harmful to aquatic algae (72 -h ErL50 = 12.3 mg/L based on loading rate)

Toxicity to microorganisms:

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriately low concentrations (180 -min EC10 = 490 mg/L based on nominal concentrations).

Remark:

Due to its low water solubility, in the key studies on acute toxicity to fish, daphnids and algae the test item (DTDA, CAS 101012 -97 -9) was applied as water accommodated fraction (WAF) as described in OECD TG 23. This procedure ensures that no undissolved test material is applied. In these studies, toxic effects expressed in a concentration-response relationship were observed although the (nominal) concentrations were far above the water solubility of DTDA of ca. 30 µg/L. These effects might be explained by the mono alkyl amine fraction (C13H29N) of 0.2%. These isomers of the C13H29N fraction are also known as tridecylamine, branched and linear (TDA, b+l, CAS 86089 -17 -0). This compound has a higher water solubility of 15 - 40 mg/L. The acute toxicity values (LC/EC50) for effects of TDA, b+l on fish, daphnids and algae are known to be in a range between 15 and 65 µg/L. These effect data correspond with the theoretical concentrations of TDA, b+l (relative fraction 0.2%) in the above listed studies with DTDA.