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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

Magnesium methanolate hydrolyse very fast into methanol and magnesium hydroxide. The determination of the adsorption/desorption coefficient is technically not feasible with magnesium methanolate and the endpoint is waived.

The half life of magnesium methanolate was determined to be T1/2 < 1 min (Hydrolysis as a Function of pH). In all experiments the hydrolysis of magnesium methanolate in buffer solutions (pH4, pH7, pH9) takes place immediately. Hydrolysis rates of >= 90% within 1 minute reaction time are observed.

Hydrolysis product methanol:

Adsorption on soil is not to be expected due to the high water solubility (> 1000g/l) of the hydrolysis product methanol as well as its low octanol-water partition coefficient (-0.77). Lokke (1984) studied the adsorption of methanol onto three different soil types at 6 deg C. Adsorption coefficients of between 0.13 and 0.61 were measured for all soil types and at all concentrations. A Koc of 1 was calculated by BASF (2004). These coefficients indicate that methanol has a low adsorptive capacity on soils.

Hydrolysis product magnesium hydroxide:

Magnesium hydroxide has a low potential to adsorb to soil based on the derived Kd value of 1.65.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

The Koc 0.13 of the hydrolysis product methanol is used for the chemical safety report