Reaction products of triphenyl phosphite and isodecanol (1:2)

PBT assessment

PBT assessment: overall result

Reference

Reference 1

Name:

Diisodecyl phenyl phosphite (DDPP)

Type of composition:

boundary composition of the substance

State / form:

liquid

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference 2

Name:

Diisodecyl phenyl phosphite (DDPP)

Type of composition:

legal entity composition of the substance

State / form:

liquid

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

Reference substance:

Diisodecyl phenyl phosphite (DDPP)

PBT status:

the substance is not PBT / vPvB

Justification:

Assessment of PBT/vPvB Properties

Persistence(P, vP)

DDPP hydrolyses rapidly, as such, abiotic degradation is expected to be the dominant pathway for DDPP in the environment. Based on the very short half-lives in water, DDPP is not expected to meet the criteria for P or vP. The hydrolysis products of DDPP (isodecanol, phenol and phosphorous acid) are readily biodegradable are also do not meet the criteria for P or vP.

Further, a new study of triphenyl phosphite (TPP) shows that this class of phosphites are 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 DDPP due to its rapid hydrolysis. The BCF model estimates for DDPP 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, isodecanol, 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 DDPP does not meet the criteria for B or vB.

Toxicity (T)

DDPP has a low order of toxicity to mammalian species. The primary effect is skin sensitisation; for which DDPP is classified.

Based on DDPP’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 DDPP a classification of Aquatic Chronic 3 (H412) has been added for DDPP.

PBT/vPvB criteria and justification

DDPP 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 irritation and sensitisation.

It should be noted that this substance was reviewed by the ECB PBT Working Group and the conclusion from their assessment was that it is not a PBT or vPvB substance.