Registration Dossier
Registration Dossier
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EC number: 200-579-1 | CAS number: 64-18-6
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
For the non-dissociated formic acid as well as for the dissociated form (formate ion), significant adsorption to solid soil phase (e.g. clay) is not expected.
Key value for chemical safety assessment
- Koc at 20 °C:
- 31
Additional information
The log Koc of the non-dissociated species of formic acid was measured to be < 1.25 in a GLP test according to OECD guideline 121. As this value refers to the uncharged molecule, which will only be present under highly acidic conditions, the Koc and logKoc of the dissociated, charged form at realistic environmental pH values was calculated by using the pKa (= 3.70) and the logPow of the uncharged molecule (= -0.46) for a corrected logKoc according to Franco et al. (2008). For the formate ion which will be present at environmental relevant pH values, slightly higher adsorption rates were estimated (Koc = 31, log Koc = 1.49) (BASF SE, 2009).
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