Registration Dossier
Registration Dossier
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EC number: 231-104-6 | CAS number: 7439-95-4
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Magnesium does not fulfill the criteria for persistency, bioaccumulation and toxicity as laid down in the TGD (EC, 2003). Therefore, this substance is not considered on PBT or vPvB substance.
-The estimated Biodegradetion show that magnesium is expected to degrade rapidly in both aerobic and anaerobic conditions.
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.1 Program and Biodegradation was predicted .
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Biowin1 (Linear Model Prediction) : Biodegrades Fast
Biowin2 (Non-Linear Model Prediction): Biodegrades Fast
Biowin3 (Ultimate Biodegradation Timeframe): Weeks
Biowin4 (Primary Biodegradation Timeframe): Days
Biowin5 (MITI Linear Model Prediction) : Biodegrades Fast
Biowin6 (MITI Non-Linear Model Prediction): Biodegrades Fast
Biowin7 (Anaerobic Model Prediction): Biodegrades Fast
Ready Biodegradability Prediction: YES
These results suggest that magnesium will be readily biodegradable and it is not expected to persist in the environment.
-A number of handbook sources at least one of which is reliable report report that the substance reacts with seawater forming the chloride
Due to magnesium ion's high solubility in water, it is the third most abundant element dissolved in seawater.
The average concentration of Magnesium ion Mg in seawater is 1295 mg/l.
Magnesium does not decompose water in cold but decomposes boiling water or steam.
Mg + H2O ( steam) ——→ MgO + H2
The half-life in marine water is smaller than 60 days
The half-life in fresh or estuarine water is smaller than 40 days
The half-life in marine sediment is smaller than 180 days
The half-life in fresh or estuarine water sediment is smaller than 120 days
The half-life in soil is smaller than 120 days
The half-life is below one week and the Biodegradetion is Fast.
Therefore, Magnesium does not fulfill the P and vP criterion.
-A reliable QSAR method predicts a value for the partition co-efficient (logKow) of -0.57 for this substance.
-This substance has a limited potential to bioaccumulate (based on log Kow used :, Log Kow estimated : -0.57, and predicted bioconcentration factors, log BCF =0.500 (EPIWIN/BCF Program).
The estimated BCF of 3.162L/kg wet-wt was measured by calculation from EPI SuiteTM v4.1 Program.
These values would suggest very low bioaccumulation potential.
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).
-This substance is effectively not toxic to Aquatic Organism and plants
This is clearly above the cut-off value of 0.1 mg/l.
Therefore, Magnesium does not meet the T criterion in the PBT assessment.
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