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Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB

Classification of Dialuminium tris[4-hydroxy-3-[(4-sulphonato-1-naphthyl)azo]naphthalenesulphonate] for effects in the environment:


The chemical Dialuminium tris[4-hydroxy-3-[(4-sulphonato-1-naphthyl)azo]naphthalenesulphonate] (CAS no. 84041-67-8) is used as a colourant in food and cosmetics. The aim was to assess whether the PBT criterion within Annex XIII was fulfilled for the substance Dialuminium tris[4-hydroxy-3-[(4-sulphonato-1-naphthyl)azo]naphthalenesulphonate]. The PBT criterion was herein assessed based on experimental data in conjunction with standardized environmental fate models. Here follows a description of the PBT assessment.



Persistence assessment

The tested substance fulfils the P criterion within Annex XIII based on the assessment that here follows:


Biotic degradation

Biodegradability of test chemical Dialuminium tris(4-hydroxy-3-((4-sulphonato-1-naphthyl)azo)naphthalenesulphonate) is predicted using OECD QSAR tool box v3.3 using log Kow as primary descriptor. The predicted value for biodegradation of chemical Dialuminium tris(4-hydroxy-3-((4-sulphonato-1-naphthyl)azo)naphthalenesulphonate is 1.39 % by considering BOD parameter and microorganisms as inoculum in 28 days..


Experimental study on read across substances (CAS: 842-18-2 and 81-11-8) also indicate the substances to be not readily biodegradable.


Hence it has been concluded that the substance Dialuminium tris[4-hydroxy-3-[(4-sulphonato-1-naphthyl)azo]naphthalenesulphonate] is likely to be persistent in nature.  


Bioaccumulation assessment

The tested substance does not fulfil the B criterion within Annex XIII based on the assessment that here follows:


Theestimatedoctanol water partition coefficient of the test chemical is 2.5775 which is less than the threshold of 4.5. If this chemical is released into the aquatic environment, there should be a low risk for the chemical to bioaccumulate in fish and food chains.



Toxicity assessment

The tested substance does not fulfil the T criterion within Annex XIII based on the assessment that here follows:



The tested chemical is regarded to be not classified for carcinogenicity, mutagenicity and reprotoxicity, Further, there is no evidence of chronic toxicity, as identified by the classifications STOT (repeated exposure), category 1(oral, dermal, inhalation of gases/vapours, inhalation of dust/mist/fume) or category 2 (oral, dermal, inhalation of gases/vapours, inhalation of dust/mist/fume).


Aquatic organisms


All of the available short-term eco-toxicity estimations for fish, invertebrates and algae for the substance indicates the LC50/EC50 value to be >100 mg/L.

The water solubility of the substance is estimated to be 0.90 mg/L which contradicts with the above eco-toxicity results. But since the molecular weight of the substance is 1423.3254 g/mol, it is likely to be insoluble and since the effect level on the eco-toxicity estimations exceeds the water solubility by 10X, typically no effects at saturation (NES) can be reported.

These value suggest that the substance is likely to be non-hazardous to Aquatic organisms at environmentally relevant concentrations and can be considered to be not classified as per the CLP regulation.


There are no available long-term toxicity evaluations for Dialuminium tris[4-hydroxy-3-[(4-sulphonato-1-naphthyl)azo]naphthalenesulphonate]. By speculation, long-term NOEC for aquatic organisms were not expected for the substance at concentration below 0.01 mg/L based on the data mentioned above.


The chemical was therefore not considered as hazardous to aquatic environments as per the criteria set out in Annex XIII.




Based on critical, independent and collective evaluation of information summarized herein, the tested compound fulfils the P criterion but does not fulfil the B and T criterion and has therefore not been classified as a PBT compound within Annex XIII.