Registration Dossier

Classification & Labelling & PBT assessment

PBT assessment

Administrative data

PBT assessment: overall result

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

Classification of 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid for effects in the environment

Several major guideline – estimation values (Klimisch 2) are available for3-acetamido-5-amino-4-hydroxybenzenesulphonic acid, indicates non substantial toxic effect for any of the 3 key trophic levels (fish, invertebrate and algae). Among the values lower values which lead to the classification of the substance the value which have been considered for further calculation (invertebrate) is LC50 = 120.261 mg/L.

 

In determining the classification appropriate to3-acetamido-5-amino-4-hydroxybenzenesulphonic acid, it 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

Reliable studies are available to demonstrate that 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is non persistent in nature and so is considered to have rapid biodegradation in the environment. In other words 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid degradation may therefore be expected to be fast. Thus it can be inferred that 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is non persistent in character. 

 

3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is non persistent and so do not satisfy the criteria for classification as persistent (P). 

 

Potential to accumulate

Predicted and measured log Kow values for 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is less than 4 (Log Kow = -0.301). The potential for 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is negligible as the BCF factor for the substance is less than 1000.  

 

 The calculated BCF of 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is 6.38 dimensionless and below the threshold of 2000. 

 

3-acetamido-5-amino-4-hydroxybenzenesulphonic acid does not satisfy the criterion for classification as bioaccumulative (B).

 

The toxicity values of fish, invertebrates and algae are LC50 = 147.8293 mg/L, EC50 = 120.261 mg/L are EC50 = 199.5558 mg/L, respectively. The toxicity values of all the trophic levels do not fall in the criteria for classification (CLP regulation) and so will not qualify for classification as per the aquatic CLP criteria for classification. 

So, 3-acetamido-5-amino-4-hydroxybenzene sulphonic acid does not satisfy for the environmental effects criterion for classification as toxic (T).

 

Thus it can be inferred that 3-acetamido-5-amino-4-hydroxybenzenesulphonic acid is neither P & B (including vPvB) substance, nor will qualify as T.