Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information


The calculated Koc is based on the method detailed in the TGD. Calculation of the log Koc to determine the potential for adsorption/desorption of chemicals is acceptable provided that a recognised and scientifically robust method is used. The TGD includes a method for calculating a log Koc using the log Kow. The log Kow of n-pentane is 3.54. The Koc of n-pentane was calculated from Log Kow 3.45 using TGD calculation of Koc = 0.81 x Log Kow + 0.1. The Koc for n-pentane is 794.3 (log Koc = 2.9). The calculated Koc of 794.3 was used in the EU RAR for n-pentane and so is considered suitable as key study for this endpoint. The value indicates that although the adsorption of n-pentane to soil will be moderate they still have good mobility in the environment.

Distribution modelling:

The distribution of the substance in the environmental compartments, air, water, soil, and sediment, has been calculated using the PETRORISK Model, version 5.3. Computer modeling is an accepted method for estimating the environmental distribution of chemicals. Distribution modeling results are included in the 'Multimedia distribution modeling results' tab in the PETRORISK spreadsheet attached to IUCLID section 13.