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Adsorption / desorption

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Description of key information

logKoc > 5; extrapolated value: logKoc: 6.4 (Garcia-Sanchez, 2011)
Calculation with KOCWIN v4.10 (EPIWIN software by US-EPA), organic-normalized sorption coefficient (Koc): 17,320,000 L/kg (MCI method estimation)

Key value for chemical safety assessment

Koc at 20 °C:
2 511 886.4

Additional information

The adsorption coefficient was determined by the HPLC screening method in accordance with OECD Guideline 121 (Garcia-Sanchez, 2011).The column temperature of the HPLC system was 40 °C. The reference Koc-values in the OECD guideline presumably refer to 25 °C. Even though the column temperature was 40 °C, this temperature has no influence on the result of the determination. Therefore the Koc -value of the test item determined within this study also refers to 25 °C. As result a logKoc greater than 5 is reported, the extrapolated value is 6.4.

Furthermore, a prediction for soil adsorption property of the substance bis(2,6-diisopropylphenyl)carbodiimide was performed by the computer program KOCWIN v2.00 (EPIWIN software) by US-EPA (Chemservice S.A., 2011). The program estimates the organic-normalized sorption coefficient for soil, which is designated as Koc. The following two models are used: the Salbjic molecular connectivity (MCI) method as well as the traditional method which is based on the logPow value of the substance. The MCI method is taken more seriously into account, due to the fact that it includes improved correction factors, resulting in a log Kocvalue of 7.239 L/kg for the chemical compound. The traditional method gives a log Koc value of 7.568 L/kg. No GLP criteria are applicable for the usage of this tool, but due to the fact that it is a scientifically accepted calculation method the estimations performed are reliable with restrictions and can be used for the chemical safety assessment.


Other adsorption coefficient indicated as dimensionless:
- other: logKoc ,6.4 at the temperature 25.0°C

[LogKoc: 6.4]