Sodium diisobutylnaphthalenesulphonate

PBT assessment

PBT assessment: overall result

Reference

Name:

Sodium diisobutylnaphtalene sulphonate

Type of composition:

legal entity composition of the substance

State / form:

solid: particulate/powder

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

Reference substance:

Sodium diisobutylnaphtalene sulphonate

PBT status:

the substance is not PBT / vPvB

Justification:

Assessment of PBT/vPvB properties

 

The assessment of PBT/vPvB properties has been done on the basis of the data available from the testing programme as well as from some calculated approaches.

 

Persistent assessment

 

To evaluate the persistence of Sodium diisobutylnaphtalene sulphonate, a readily biodegradation study, an inherently biodegradation study, a biodegradation study in soil and a biodegradation study with activated sludges are available. The substance resulted not readily biodegradable, but inherently, primary biodegradable, with a 27% of biodegradation after 28 days.

Also a hydrolysis test has been carried out, but the half life of the substance has been extimated to be higher than 1 year at 25°C and, therefore, hydrolysis is not expected to be a relevant pathway of removal from the environment.  

The logKoc for Sodium diisobutylnaphtalene sulphonate is in the range from 1.78 to 2.37 and the substance is therefore expected to have a medium to high mobilty.

If released in the atmosphere, Sodium diisobutylnaphtalene sulphonate is not expected tobe present as vapour, basing on a vapour pressure of 2.9 x 10^-11Pa (water: 3,200 Pa at 25°C).

 

As a result of the previous considerations, Sodium diisobutylnaphtalene sulphonate meets the criteria of Annex XIII of Regulation EC 1907/2006 for the classification as “Persistent”.

 

 Bioaccumulation assessment

 

As a result of the low value of logKOW (0.54), Sodium diisobutylnaphtalene sulphonate is not expected to bioaccumulate in aquatic organisms.

On the basis of the above consideration, the substance is not expected to meet the criteria of Annex XIII of Regulation EC 1907/2006 for the classification as “Bioaccumulative”.

 

Toxicity assessment

 

In acute toxicity studies with aquatic organism, the substance showed L(E)C50 values > than 1 mg/L and it is not of concern for its aquatic toxicity. The substance is classified nether as Toxic nor as carcinogenic (category 1 or 2), mutagenic (category 1 or 2), or toxic for reproduction (category 1A, 1B or 2) according to Regulation 1272/2008/EC. Basing on the available data, the substance is not of concern for its chronic toxicity.

On the basis of the above consideration, it can be reasonably assumed that the substance does not meet the criteria of Annex XIII of Regulation EC 1907/2006 for the classification as “Toxic”.

  

Summary and overall conclusions on PBT or vPvB properties

 

On the basis of the available data, Sodium diisobutylnaphtalene sulphonate, if released in the environment, will mainly distribute into the aquatic compartment, where it is not expected to rapidly degrade through a biotic pathway. The substance is not expected to bioaccumulate and it is of moderate toxicity for aquatic organisms, as indicated by the short-term ecotoxicity studies on fish, crustaceans and algae preformed.

In conclusion, considering all the available data, the substance fulfil the criteria for the classification as “Persistent” according toAnnex XIII of Regulation EC 1907/2006 but itdoes not meet the criteria of classification as “Bioaccumulative” and “Toxic”. Therefore Sodium diisobutylnaphtalene sulphonate is not considered to be neither a PBT nor a vPvB substance.

  

Emission characterization

 

Because the substance does not fulfil the PBT and vPvB criteria, no emission characterisation is performed.