Oleic acid, monoester with propane-1,2-diol

PBT assessment

PBT assessment: overall result

PBT status:

the substance is not PBT / vPvB

Justification:

Classification of Oleic acid, monoester with propane-1,2-diol for effects in the environment:

 

The chemical Oleic acid, monoester with propane-1,2-diol (CAS no. 1330-80-9) is used as a surfactant. The aim was to assess whether the PBT criterion within Annex XIII was fulfilled for Oleic acid, monoester with propane-1,2-diol. 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

In a prediction done by SSS (2017) using OECD QSAR toolbox version 3.4 with log Kow as the primary descriptor, percentage biodegradability of test chemical 2-hydroxypropyl octadec-9-enoate(CAS No. 1330-80-9)was estimated. Test substance undergoes 68.16% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical 2-hydroxypropyl octadec-9-enoate was estimated to be readily biodegradable in water.

 

In another prediction using the Estimation Programs Interface Suite (EPI suite, 2017), the biodegradation potential of the test compound 2-hydroxypropyl octadec-9-enoate(CAS No. 1330-80-9)in the presence of mixed populations of environmental microorganisms was estimated. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that chemical 2 -hydroxypropyl octadec-9 -enoate is expected to be readily biodegradable.

 

Various experimental studies on read across substances (CAS: 111-03-5 and 111-82-0) also indicate the substances to be readily biodegradable.

 

Environmental fate

According to the fugacity model levels III, the most likely environmental fate for this test chemical is soil (i.e.estimated to 73.5%). In soil, Oleic acid, monoester with propane-1,2-diol was expected to have negligible mobility based upon an estimated Log KOC in the range 4 – 5.44. 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, 23.1 % of the chemical will partition into water according to the Mackay fugacity model level III in EPI suite version 4.1 (2016). However, the half-life (15 days estimated by EPI suite) indicates that 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 5% when estimated by EPI Suite version 4.1).

 

Hence it has been concluded that Oleic acid, monoester with propane-1,2-diol is not persistent in nature.  

 

Bioaccumulation assessment

The tested substance fulfils the B criterion within Annex XIII based on the assessment that here follows:

 

The estimated BCF value for the substance is in the range 2000 - 2006 L/kg wet wt and the estimated log octanol-water partition coefficient (log Kow) was determined to 7.46. If this chemical is released into the aquatic environment, there should be a moderate 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

As per Column 2 (Annex VII and VIII) of the REACH regulation, a study does not need to be conducted if there are mitigating factors indicating that aquatic toxicity is unlikely to occur for instance if the substance is insoluble in water (solubility: 0.0097 mg/L). 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 fulfils the B criterion but does not fulfil the P and T criterion and has therefore not been classified as a PBT compound within Annex XIII.