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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption desorption (OECD 121, EU Method C.19) The mean adsorption coefficient log KOC of "3-hydroxy-2-(hydroxymethyl)-2-methylpropionaldehyde" is 1.16 at pH 6.5.

Key value for chemical safety assessment

Koc at 20 °C:
15

Additional information

The adsorption coefficient (log Koc) was determined using HPLC.

The actual pH value of the mobile phase during the test was 6.5.

The temperature during the test was 35 °C.

The calibration curve of the reference substances was: log k' = 0.4092 x log KOC – 0.491.

The results of the individual determinations of the decadic logarithm of the adsorption coefficient log KOC of "3-hydroxy-2-(hydroxymethyl)-2- methylpropionaldehyde" were 1.16 and 1.16. The mean adsorption coefficient log KOC of "3-hydroxy-2-(hydroxymethyl)-2-methylpropionaldehyde" is 1.16* at pH 6.5.

*The experimentally determined log KOC is outside the range (1.5 to 5.0) for which the method is published in the guideline.