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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient for n/i-C13 -C15 –aldehydes indicates that adsorption to soil is possible (log Koc: 3.12; ECT, 2011).

Key value for chemical safety assessment

Koc at 20 °C:
1 321

Additional information

In accordance with column 2 of REACH Annex VIII, an adsorption/desorption study is not required if the substance and its relevant degradation products decompose readily. This holds true for the submission substance (readily biodegradable).

In order to assess the adsorption coefficient for n/i-C13 -C15 aldehydes, the log Koc values of the individual components were calculated using the MCI method of KOCWIN v2.00 (EPI Suite, v4.10, US EPA), which is more accurate than the log Kow method of KOCWIN.

n-C13 -aldehyde: log Koc = 2.6

i-C13 -aldehyde: log Koc = 2.5

n-C15 -aldehyde: log Koc = 3.1

i-C15 -aldehyde: log Koc = 3.1

Following a worst-case-approach the log Koc value taken for n/i-C13 -C15 -aldehydes is 3.12. This value indicates that adsorption to the solid soil phase is expected (ECT, 2011). According to the classification scheme for mobility by McCall et al. (1981), this would correspond to the "low mobility class" (for Koc values between 500 and 2000). The scheme differentiates between 6 classes for Koc values between 0 and >5000: very high mobility (0 -50); high mobility (50 -150), medium mobility (150 -500), low mobility, slight mobility (2000 -5000) and immobile (>5000).

McCall, P.J.; Laskowski, D.A.; Swann, R.L.; Dishburger, H.J. (1981)

Measurement of sorption coefficients of organic chemicals and their use in environmental fate analysis

In: AOAC, Association of Official Analytical Chemists, Test Protocols for Environmental Fate & Movement of Toxicants, Proceedings of a Symposium Association of Official Analytical Chemists, 94th Annual Meeting, October 21, 22, 1980, Washington, DC, 89-109

[LogKoc: 3.12]