Registration Dossier
Registration Dossier
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EC number: 267-466-7 | CAS number: 67874-37-7
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Assessment of PBT/vPvB Properties
Persistence(P, vP)
PDiTDP is expected to readily hydrolyse in water and thus is not expected to meet the criteria for P or vP. Further, the hydrolysis products of PDiTDP (isotridecanol, phenol and phosphorous acid) are readily biodegradable are also do not meet the criteria for P or vP.
Further, new OECD 301 D studies of triphenyl phosphite (TPP) and TiTDP show that this class of phosphites is inherently to readily biodegradable when the test system is properly designed for the properties of the substance.
Bioaccumulation (B, vB)
Bioaccumulation concentration factor (BCF) cannot not be measured for PDiTDP due to its rapid hydrolysis. The BCF model estimates are generally low, though they may be of limited utility given their wide range and the fact that hydrolysis is not considered in the model. Given the rapid hydrolysis, the bioaccumulation potential of the hydrolysis products, isotridecanol, phenol and phosphorous acid, were considered. All are low and well below the criterion for B (bioaccumulative) or vB (very bioaccumulative). As such, it is concluded that PDiTDP does not meet the criteria for B or vB.
Toxicity (T)
PDiTDP has a low order of toxicity to mammalian species. The primary effect is skin sensitisation; for which it is classified.
Based on PDiTDP’s low water solubility and rapid hydrolysis, it is not anticipated to cause aquatic toxicity based on the amount and relatively aquatic toxicity of its hydrolysis products. One of its hydrolysis products (phenol) is classified as dangerous to the environment (Aquatic Chronic 2). Based on the relative amounts of phenyl groups in PDiTDP a classification of Aquatic Chronic 3 (H412) has been added for PDiTDP.
PBT/vPvB criteria and justification
PDiTDP is not classifiable as a PBT or a vPvB substance as it does not meet criteria for either persistence or bioaccumulation and toxicity effects are primarily related to its potential for skin sensitisation.
It should be noted that a closely related analog to this substance, phenyl diisodecyl phosphite, was reviewed by the ECB PBT Working Group and the conclusion from their assessment was that it is not a PBT or vPvB substance.
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