2-octadecyl-1H-thioxantheno[2,1,9-def]isoquinoline-1,3(2H)-dione

PBT assessment

PBT assessment: overall result

PBT status:

the substance is not PBT / vPvB

Justification:

Classification of 2-octadecyl-1H-thioxantheno[2,1,9-def]isoquinoline-1,3(2H)-dione for effects in the environment:

 

2-octadecyl-1H-thioxantheno[2,1,9-def]isoquinoline-1,3(2H)-dione (CAS no. 27870-92-4) is used as an intermediate in dyestuff application and chemical synthesis as well as laboratory chemcal. The aim of the PBT assessment was to evaluate whether this chemical fulfils the PBT criterion within Annex XIII. The PBT assessment were based on toxicological information in conjunction with standardized environmental fate- and bioaccumulation models. Here follows a description of the PBT assessment.

 

 

Persistence assessment

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

 

Environmental fate

According to the fugacity model levels III, the most likely environmental fate for this test chemical is soil (i.e.estimated to 83.4%). The half-life in soil (75 days estimated by EPI suite) indicates that the exposure risk to soil-dwelling organism should therefore be low.

 

If released in to the environment, 16.4 % of the chemical will partition into water according to the Mackay fugacity model level III in EPI suite version 4.1 (2016). However, the half-life (37.5 days estimated by EPI suite) indicates that the exposure risk to aquatic animals is moderate to low.

However, its persistent characteristic is only observed in the sediment compartment but Fugacity modelling shows that sediment is not an important environmental fate (less than 1% when estimated by EPI Suite version 4.1). Hence it has been concluded that 2-octadecyl-1H-thioxantheno[2,1,9-def]isoquinoline-1,3(2H)-dione is not persistent in nature.  

 

 

Bioaccumulation assessment

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

 

The BCF value is estimated as 18.09 at 25ºC (EPI suite version 4.1, 2016). 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:

 

Mammals

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

The available short-term eco-toxicity estimation for fish, invertebrates and algae for the substance indicates the LC50/EC50 value as 515.10 and 0.0000000823 mg/L, 93.72 and 0.000000127 mg/L; 20.28 and 0.00000596 mg/L respectively.These values suggest classification for aquatic toxicity will be applicable as per CLP criteria but since the substance has a molecular weight of 555.823 g/mol, by speculation, the molecular size of the test substance was so large that reduce the intake rate of chemical into the tissues of aquatic biota. Hence, based on this it can be considered that the chemical was non-toxic to aquatic organisms and thus can be classified as non- hazardous as per the CLP criteria.In addition, the chemical was not considered as hazardous to aquatic environments as per the criteria set out in Annex XIII.

 

 

Conclusion

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