1,4-naphthoquinone

PBT assessment

PBT assessment: overall result

Reference

Reference 1

Name:

1,4-naphthoquinone

Type of composition:

boundary composition of the substance

State / form:

solid: particulate/powder

Reference substance:

1,4-naphthoquinone

Reference 2

Name:

1,4-naphthoquinone

Type of composition:

legal entity composition of the substance

State / form:

solid: particulate/powder

Reference substance:

1,4-naphthoquinone

PBT status:

the substance is not PBT / vPvB

Justification:

Comparison with the Criteria of Annex XIII. An assessment of the PBT/vPvB status of the test substance has been made using all available data.

Persistence Assessment. The substance is not considered to be readily biodegradable with no biodegradation seen in a 28 day study. However, hydrolysis of the substance was observed with an experimental half-life at 25°C of 12 days at neutral pH. This half-life was greatly reduced under alkaline conditions. This indicates that the substance is unlikely to be persistent under environmental conditions and will likely degrade abiotically.

Bioaccumulation Assessment: No studies to assess bioaccumulation in aquatic species have been conducted. The low Log Kow value (<4.5) indicates that the test material is unlikely to be bioaccumulative in aquatic systems, and as such is considered to have a low potential for bioaccumulation.

Toxicity assessment: The acute toxicity for all three trophic levels are much higher than the PBT screening criterion of < 0.1 mg/L (Fish the most sensitive species with a 96hr LC50 of 33.5 mg/L).

The overall conclusions, based on the present available data, are that the (screening) criteria for PBT/vPvB, as outlined in Annex XIII of REACH, are not met and that further testing in the scope of the final PBT assessment is not considered to be required.