Registration Dossier
Registration Dossier
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EC number: 203-715-8 | CAS number: 109-88-6
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Magnesium methanolate hydrolysis within minutes into methanol and magnesium hydroxide.
The hydrolysis product methanol is readily biodegradable under both aerobic and anaerobic conditions in a wide variety of environmental media including fresh and salt water, sediments and soils, ground water, aquifer material and industrial wastewater. The hydrolysis product magnesium hydroxide is an inorganic substance and as such biodegradation is not relevant. Both hydrolysis products are natural occuring substances.
Magnesium methanolate and its hydrolysis products methanol and magnesium hydroxide are not persistance (P) in the environment.
Magnesium methanolate hydrolysis very fast into methanol and magnesium hydroxide. The determination of the partitions 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.
A very low logPow of magnesium methanolate was predicted by QSAR according to EPI Suite 4.11 (KOWWIN v. 1.68) and the data are used as supporting data. The predicted LogPow = -1.99 at 25°C. The LogPow of the hydrolysis product methanol is -0.77 at 20°C. For magnesium hydroxide as an inorganic substance no logPow can be determined.
Based on the available data it can be considered that magnesium methanolate and its hydrolysis products methanol and magnesium hydroxide have a low potential for bioaccumulation and can be considered as not bioaccumulative (B).
Magnesium methanolate hydrolyse very fast into methanol and magnesium hydroxide. Based on the available data for marine/freshwater organisms the hydrolysis products as natural occuring substances can be considered as safe for the environment. The substance magnesium methanolate and its hydrolysis products methanol and magnesium hydroxide are not CMR or chronic toxic substances. Therefore magnesium methanolate and its hydrolysis products methanol and magnesium hydroxide can be consiedered and not toxic (T).
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