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EC number: 208-336-1 | CAS number: 522-75-8
Classification of 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione for effects in the environment:
The chemical 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione (CAS no. 522-75-8) is used in dyestuff industry. The aim was to assess whether the PBT criterion within Annex XIII was fulfilled for 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione. 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.
The tested substance does not fulfils the P criterion within Annex XIII based on the assessment that here follows:
According to the fugacity model levels III, the most likely environmental fate for this test chemical is soil (i.e.estimated to 87.1%). In soil, 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dionewas expected to have slow to negligible mobility based upon an estimated Log KOC in the range 3.10 – 3.42. Thehalf-life in soil (75 days estimated by EPI suite) indicates that the chemical is not persistent in soil and the exposure risk to soil dwelling animals is moderate to low.
If released in to the environment, 11.2% of the chemical will partition into water according to the Mackay fugacity model level III in EPI suite version 4.1 (2017). However, the half-life (37.5 days estimated by EPI suite) indicates that the exposure risk to aquatic animals is moderate to low.
Moreover, its persistent characteristic is only observed in the sediment compartment but Fugacity modelling shows that sediment is not an important environmental fate (less than 2% when estimated by EPI Suite version 4.1).
Hence it has been concluded that 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione is not persistent in nature
The tested substance does not fulfil the B criterion within Annex XIII based on the assessment that here follows:
The BCF value from various databases was determined to be in the range 25 - 382 L/kg wet wt. and the estimated octanol water partition coefficient of the test chemical is 3.53 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.
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).
All of the available short-term eco-toxicity estimation for invertebrates and algae for the substance indicates the LC50/EC50 value to be > 100 mg/L. These value suggest that the substance is likely to be non-hazardous to Aquatic organisms at environmentally relevant concentrations and can be considered as not classified as per the CLP regulation.
There are no available long-term toxicity evaluations for 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione. By speculation, long-term NOEC for aquatic organisms were not expected for 3H,3'H-2,2'-bi-1-benzothiophene-3,3'-dione 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 does not fulfil the P, B and T criterion and has therefore not been classified as a PBT compound within Annex XIII.
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