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Environmental fate & pathways

Adsorption / desorption

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Link to relevant study record(s)

Description of key information

A study conducted in accordance with the OECD Testing Guideline 121 (Adsorption Coefficient on Soil and on Sewage Sludge using HPLC) and GLP requirements. The results of this study indicate that the mean log Koc value is 1.66.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

The objective of the key study was to determine the Adsorption Coefficient of the test item heptan-1-ol applying the procedure described in the OECD Guideline 121 Adsorption Coefficient on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC).

As it can be seen in the table below, the 3 replicate determinations show that the mean log Koc value is 1.66. 




Adsorption Coefficient

Log Koc

Test 1


Test 2


Test 3


Mean Value



A log Koc experimental value of 1.14 is also reported in Meylan and Howard, 1992* but without any details with regards to the experimental conditions. Nevertheless, this value confirms that the substance has a low adsorption potential.


*MEYLAN-W, HOWARD-PH, BOETHLING-RS. 1992. Molecular topology/fragment contribution method for predicting soil sorption coefficients. Environ-Sci-Technol: 26, 1560-1567