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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
other: Endpoint Assessment Report: Adsorption/desorption
Adequacy of study:
key study
Study period:
March 2018
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline required
Principles of method if other than guideline:
- Principle of test: Screening procedure used to assess the potential for adsorption/desorption of PPG-2 myristic ether propionate.
- Short description of test conditions: The assessment has been made with reference to the soil adsorption coefficient, partition coefficient and water solubility properties of the substance in relation to soil adsorption coefficients (Log Koc). Log Koc values were calculated via KOCWIN v2.00, which estimates Koc using the Molecular Connectivity Index (MCI) method. This is regarded as more robust than the log Kow-based method.
- Parameters analysed / observed: Potential of PPG-2 myristic ether propionate to adsorption/desorption to soil/sediment and migrate to ground water.
GLP compliance:
no
Key result
Type:
other: Enpoint Expert Assessment: adsorption/desorption
Remarks on result:
other: Quantative results not determined as no test was performed for this endpoint.
Key result
Type:
other: Enpoint Expert Assessment: adsorption/desorption
Remarks on result:
other: Quantative results not determined as no test was performed for this endpoint.
Conclusions:
The calculated soil adsorption coefficients (Log Koc) of the identified constituents of PPG-2 myristil ether propionate fall in the range 3.378-4.386.
This indicates that the substance overall will exhibit a strong sorption to soil/sediment, and negligible to slow migration to ground water.
Executive summary:

The constituents of PPG-2 myristyl ether propionate are expected to be insoluble in water due to the presence of long non-polar hydrocarbon chains. Although polar functionality is present in the constituents, it is believed that these functionalities would not be sufficient to offset the lipophilicity of the tetradecyl hydrocarbon chains.

The substance is therefore expected to be highly insoluble in water based on the overall non-polar nature of the constituents present.

Calculated water solubilities range from 0.001361 - 0.1828 mg/L at 25°C.

Calculated partition coefficients (Log Kow) range from 6.04 - 7.53.

Calculated soil adsorption coefficients range (Log Koc) range from 3.378 - 4.386.

Based on the calculated Log Koc values, the constituents of PPG-2 myristyl ether propionate can be described as exhibiting a strong sorption to soil/sediment, and negligible to slow migration to ground water.

The high log Kow values and very low water solubilities strongly support this conclusion.

Description of key information

Calculated soil adsorption coefficients range (Log Koc) range from 3.378 - 4.386.

Based on the calculated Log Koc values, the constituents of PPG-2 myristyl ether propionate can be described as exhibiting a strong sorption to soil/sediment, and negligible to slow migration to ground water.

Key value for chemical safety assessment

Koc at 20 °C:
3.378

Additional information

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