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PBT assessment

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PBT assessment: overall result

Reference
Name:
2'-acetonaphthone
Type of composition:
boundary composition of the substance
State / form:
solid: bulk
Reference substance:
Composition 1
PBT status:
the substance is not PBT / vPvB
Justification:

Classification of 2’-acetonaphthone for effects in the environment:

 

The chemical 2’-acetonaphthone (CAS no. 93-08-3) is used as a flavouring agent or adjuvant. It is also used as an inert ingredient in non-food pesticide products. The aim was to assess whether the PBT criterion within Annex XIII was fulfilled for 2’-acetonaphthone.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.

 

Persistence assessment

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

 

Biotic degradation

35-days Closed Bottle test following the OECD guideline 301 D was performed to determine the ready biodegradability of the test chemical. The test system included control, test item and reference item. The concentration of test and reference item ( Sodium Benzoate) chosen for both the study was 4 mg/L, while that of inoculum was 32 ml/l. ThOD (Theoretical oxygen demand) of test and reference item was determined by calculation. % degradation was calculated using the values of BOD and ThOD for test item and reference item. The BOD35 value of test chemical was observed to be 0.87 mgO2/mg. ThOD was calculated as 2.63 mgO2/mg. Accordingly, the % degradation of the test item after 35 days of incubation at 20 ± 1°C according to Closed Bottle test was determined to be 33.07 %. Based on the results, the test chemical, under the test conditions was considered to be primary inherently biodegradable at 20 ± 1°C over a period of 35 days.

 

Thus, based on the available information, it indicates that chemical 2’-acetonaphthone can be considered to be primary inherently biodegradable in water and thus likely to be not persistent (not P) in nature.

 

Environmental fate

According to the fugacity model levels III, the most likely environmental fate for this test chemical is soil (i.e.estimated to 74%). In soil,2’-acetonaphthonewas expected to have slow mobility based upon a Log KOC value of 2.834. The half-life in soil (30 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, 19.2% 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 (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and 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 1% i.e. reported as 0.675% when estimated by EPI Suite version 4.1).

 

Hence it has been concluded that 2’-acetonaphthone 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 octanol water partition coefficient of the test chemical was determined to be 2.677, respectively, 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.

 

 

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

All of the available short-term eco-toxicity data for fish, aq. invertebrates and algae for the substance2’-acetonaphthoneindicates the LC50/EC50 value to be in the range 5 mg/l to 48.1 mg/L, respectively. These value suggest that the substance is likely to be hazardous to aquatic organisms at environmentally relevant concentrations and can be considered to be classified in ‘Aquatic chronic category 2’ as per the CLP regulation.

 

On the basis ofthe estimated data oflong term eco-toxicity data for fish and aq. Invertebrates, the NOEC value was estimated to be ranges from 1.798 to 2.587 mg/l, respectively. By speculation, long-term NOEC for aquatic organisms were not expected for the substance 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.

 

 

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.