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Environmental fate & pathways

Adsorption / desorption

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Description of key information

A Koc value of 0.00264 is predicted using the equations of Sabljić et al (1995) for non-hydrophobics.

Key value for chemical safety assessment

Koc at 20 °C:
0.003

Additional information

The result of the adsorption-desorption test with tetrakis(hydroxymethyl)phosphonium sulphate, a salt which is expected to behave similarly to the corresponding chloride salt showed that the adsorption phenomena is not expected to be important on soil or sediment. A median adsorption Koc of 210 was calculated which classifies the substance as medium to highly mobile in soil and sediment.

The adsorption-desorption potential on soil has been studied using the High Performance Liquid Chromatography (HPLC) method according to the OECD 121 guideline. During this experiment the test material did not eluate from the column. It was then concluded that the HPLC method was not appropriate to this substance.

Finally in accordance with the equation for non hydrophobic substances proposed in EUSES 2.1 as well as the ECHA guidance R7A a Koc value was estimated. This estimated value confirmed previous assumptions of low adsorption on soil and sediment with a Koc value of 0.00264 predicted. this latest value is used in the risk assessment.

The predicted Koc value of 0.00264 is considered as the more relevant for the risk assessment and is used for the risk evaluation.