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Classification & Labelling & PBT assessment

PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
Justification:

Persistence – Conclusion

1-Butylpyridinium heptachlorodialuminate (CAS 67226-45-3) is an ionic liquid that consist of an N-butylpyridinium cation and a heptachloroaluminate anion that hydrolyses very rapidly in contact with water. According to literature systems with chloroaluminate anions must be classified as extremely hygroscopic and labile towards hydrolysis. The aluminium (III) halides are extremely sensitive to even the smallest amounts of water. In the literature it is described that when water is added to chloroaluminate ionic liquid of any composition, an exothermic reaction occurs with the evolution of HCI. This reaction produces oxide- and proton-containing species, both of which can interact with other solutes.

Therefore, the substance itself is not persistent.

The hydrolysis product N-Butylpyridinium chloride (CAS 1124-64-7) is not readily biodegradable according to OECD criteria (see Section 4). Therefore, this hydrolysis product may persist in the environment (P).

 

Bioaccumulation– Conclusion

The hydrolysis product N-Butylpyridinium chloride (CAS 1124-64-7) has low log Kow values (<3) and, therefore, is not likely to bioaccumulate.

Furthermore, Assessment of the toxicokinetic behaviour of the substance and the breakdown products formed after hydrolysis in aqueous environment showed that all these compounds are relatively poorly absorbed, and fairly rapidly eliminated by the body and therefore no potential for accumulation is foreseen.

Therefore, the substance and hydrolysis products do not meet the screening criterion for bioaccumulation and are not considered to be bioaccumulative (B) or very bioaccumulative (vB).

 

Toxicity – Conclusion

The substance does not meet the classification for toxic (T) in the environment because the short term data available with aquatic invertebrates and algae present EC values >1 mg/L. Thus, the criteria set out in Annex XIII of Regulation (EC) No. 1907/2006 are not met and the test substance is not considered to meet the T criterion.

The substance is not classified as carcinogenic (cat. 1 or 2), mutagenic (cat. 1 or 2), or toxic for reproduction (cat. 1, 2 or 3) according to Directive 67/548/EEC or carcinogenic (cat. 1A or 1B), germ cell mutagenic (cat. 1A or 1B), or toxic for reproduction (cat. 1A, 1B or 2) according

to Regulation (EC) No. 1272/2008. There is no other evidence of chronic toxicity, as identified by the classifications T, R48 or Xn, R48 according to Directive 67/548/EEC or specific target organ toxicity after repeated exposure (STOT RE cat. 1 or 2) according to Regulation (EC) No. 1272/2008.

The test substance is not considered to meet the T criterion.