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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to the solid soil phase is not expected, and may be waived on the basis that the substance has a low Log Kow value (which is related to this parameter).

In addition, reliable calculated Koc and Log Koc values of (31 and 1.49, respectively) are available from formic acid (Franco and Trapp, 2008; BASF SE, 2009) and is considered to be suitable for read-across, given that potassium formate a potassium salt of formic acid, and will dissociate immediately in aqueous and biological surroundings to the formate ion. It is therefore expected that the environmental profile of formic acid and potassium formate will be similar. 

Key value for chemical safety assessment

Koc at 20 °C:
31

Additional information

In accordance with column 2 of REACH Annex VIII, the study does not need to be conducted since potassium formate is readily biodegradable (HRC, 1992) and has a low potential for adsorption due to high water solubility coupled with a very low octanol-water partition coefficient (log Kow <0, OSPAR, 2002).

A read across was performed to formic acid in order to have a reliable value for the calculation of PNECsed and PNECsoil via the equilibrium partitioning method.

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 and Trapp (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).

[LogKoc: 1.49]