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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is possible.

Key value for chemical safety assessment

Additional information

Log Koc calculated using the formula for nonhydrophics as given in TGD part 3 (2003), resulted in a value of 1.202, suggesting moderate to high mobility of formaldehyde in soil (BASF SE, 2008). This observation is underlined by an assessment on soil adsorption properties of formaldehyde as given in WHO (2002) and Environment Canada (2001): "Formaldehyde is not expected to adsorb to soil particles to a great degree and would be considered mobile in the soil, based on its estimated Koc (log Koc range: 0.70 to 1.57 as derived from various literature studies). According to Kenaga (1980), compounds with a Koc of 100 are considered to be moderately mobile. Formaldehyde can be transported to surface water through runoff and to groundwater as a result of leaching. Parameters other than Koc affecting its leaching to groundwater include the soil type, the amount and frequency of rainfall, the depth of the groundwater and the extent of degradation of formaldehyde."

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