Registration Dossier
Registration Dossier
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EC number: 224-924-0 | CAS number: 4553-89-3
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Classification of disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate for effects in the environment
In determining the classification appropriate todisodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonateit is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behaviour that may present a long-term and/or delayed danger to the structure and/or functioning of aquatic ecosystems. These points are considered below.
Persistence
Based on the results from the predictions with Biowin models, supported by the Fugacity model III, which indicate the half life of the chemicaldisodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonateas 60 days in water medium, which clearly indicate that the is not persistent in water medium, though it is expected to be persistent in soil and sediment based on the half lives.
Thus, the chemical is likely to be Persistent in the sediment compartment of aquatic environment.
Potential to accumulate
The estimated bioconcentration factor (BCF) fordisodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonateis 3.162 L/kg wet-wt which does not exceed the bioconcentration threshold of 2000. Thus it is concluded that the chemical is not expected to bioaccumulate in the food chain.Thus, the chemical does not satisfy the criterion for classification as bio-accumulative (B).
The toxicity values of fish, invertebrates and algae are LC50 = 1311.92 mg/L, LC50 = 145.22 mg/L and EC50 = 155.21 mg/L, respectively. These values suggest that the chemical shall not exhibit Aquatic toxicity
Also, as per the Toxicity criteria of Annex XIII of the REACH regulation, the chemical is not expected to qualify the criteria as Toxic. Thus, it is a not toxic chemical.
Thus, the chemicaldisodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonateis not a PBT chemical.
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