Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 215-170-3 | CAS number: 1309-42-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- For details and justification of read-across please refer to the attached report in section 13 of IUCLID.
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Sample No.:
- #1
- Type:
- Kd
- Value:
- 1.65 L/kg
- Remarks on result:
- other: no details available on pH or temperature
- Transformation products:
- not specified
- Validity criteria fulfilled:
- not applicable
- Remarks:
- publication with measurements
- Conclusions:
- The median Kd vaule for magnesium hydroxide compounds is 1.65 L/kg based on read across.
- Executive summary:
The Forum of European Geological Surveys (FOREGS) Geochemical Atlas of Europe ('Salminen, R. (ed.) 2005) provided paired sediment-water concentrations of magnesium and magnesium oxide from which sediment partition coefficients (Kd values) could be derived. The cumulative distribution of the 806 pairs is available. The sediment-water partition coefficients were calculated for each of the pairs using the following equation: Kd = Cs / Caq Where Cs = the total concentration of the test substance in the solid phase (mg/kg) and Caq = concentration of test substance in aqueous phase (mg/L). The detection limit for magnesium and magnesium oxide in water was 0.001 mg/L. The median Kd value of 1.65 L/kg will be used for the risk assessment. This indicates that magnesium hydroxide has a low sediment adsorption potential.
Reference
Table 1. Sediment-water partition coefficients (Kd) for magnesium/magnesium oxide compounds
|
Kd (L/kg) |
||||
N |
Min |
Max |
Median |
10thPercentile |
90thPercentile |
806 |
0 |
562.5 |
1.65 |
3.5 |
12.23 |
Description of key information
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
Other adsorption coefficients
- Type:
- other: Kd (sediment-water)
- Value in L/kg:
- 1.65
Additional information
The Forum of European Geological Surveys (FOREGS) Geochemical Atlas of Europe ('Salminen, R. (ed.) 2005) provided paired sediment-water concentrations of magnesium and magnesium oxide from which sediment partition coefficients (Kd values) could be derived. The cumulative distribution of the 806 pairs is available.
The median Kd value of 1.65 L/kg will be used for the risk assessment. This indicates that magnesium hydroxide has a low sediment adsorption potential.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
