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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB

8.1.1. Persistence Assessment A closed bottle test (OECD 301D) showed that vinyl chloride is not readily biodegradable. However, as vinyl chloride is a gas at ambient temperature, it can be assumed that the air compartment is the most important compartment for assessment of the persistence. According to the recommendations in the Guidance on information requirements and chemical safety assessments, Chapter R.7b: Endpoint specific guidance, Section R. (May 2008, ECHA), it may be considered for substances that are a gas under ambient condition, that they are removed from the aquatic compartment via volatilization. In the atmosphere, vinyl chloride degrades via reaction with hydroxyl radicals with a half-life time of approximately 2.3 days; vinyl chloride can therefore be regarded as not persistent. 8.1.2. Bioaccumulation Assessment No experimental BCF results are available. The potential for bioaccumulation was therefore assessed on the basis of the log KOWusing the computer program BCFWIN™ (2000). The model shows no bioaccumulative potential for vinyl chloride (3.55 l/kg). Further testing in the scope of the PBT assessment is therefore not deemed necessary. 8.1.3. Toxicity Assessment The acute effect information for all three trophic levels is much higher than the screening criterion of 0.1 mg/l. It can therefore be expected that vinyl chloride is not toxic towards aquatic organisms. However, vinyl chloride is classified as a carcinogenic, category 1 and therefore needs to be assigned as being T. 8.1.4. Summary and overall Conclusions on PBT or vPvB Properties The overall conclusions, based on the present available data, of the preliminary PBT assessment are that the (screening) criteria for PBT/vPvB are not met and that further testing in the scope of the final PBT assessment is not considered to be required.

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