Registration Dossier
Registration Dossier
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EC number: 483-390-9 | CAS number: 12508-61-1
Endpoint summary
Administrative data
Description of key information
Additional information
Environmental fate and pathways
As the registered substance is an inorganic metal salt it was not technically possible, or necessary, to perform testing in this area.
Hydrolysis
Hydrolysis tests are not possible on metal salts. Therefore testing was not performed.
Biodegradation in water
Annex VII, point 9.2.1.1 of column 2 of Regulation (EC) No 1907/2006 of the European Parliament and of the council of 18th December 2006, states that "The study does not need to be conducted if the substance is inorganic", therefore this test has not been conducted.
Absorption/desorption
In accordance to Annex XI section 2 REACH Regulation (EC) No 1907/2006, the performance of the adsorption/ desorption study is technically not feasible. The adsorption/desorption method OECD 121 (HPLC method) is technically not feasible. The analytical determination of the substance with the recommended HPLC method is not possible since the substance is a metal containing inorganic material.
Also in the adsorption/desorption study OECD 106 reproducible and reliable analytical methods are required to quantify the substance. The substance magnesium hydroxide sulphate trihydrate (EC 483-390-9) dissociates in water into the sulfate, hydoxide and magnesium ion. In the tests with aqueous media (water solubility, acute aquatic toxicity) magnesium was analytically determined. This is the only possibility to analyse the substance. The water solubility based on the measurement of magnesium was 46 mg/L. This would be the maximum test concentration which could be used in an adsorption/desorption study. For the adsorption/desorption study OECD 106 soils should cover a wide range of soil properties. With exception of sandy soils with a low pH and rich in quartz the used soil matrix contains considerable amounts of magnesium. As a natural component in soils magnesium occurs up to 5 g/kg soil in Central European soils. Besides the magnesium in the solid soil components, magnesium can be found in the soil solutions and as exchangeable magnesium on the surface of the soil. Concentrations up to 60 mg/L can be observed in soil solutions (Scheffer, Schachtschabel (2010) – Lehrbuch der Bodenkunde). Magnesium contained in the substance does not absorb/desorb to/from soil but constantly exchanges with magnesium or other kations (e.g. calcium) present on the soil surface. Due to the steady exchange between magnesium from the test substance and magnesium from soil a differentiation of both magnesium sources is not possible with the analytical method. Consequently, only the determination of the total magnesium is feasible whereas a quantification of the magnesium originating from the test substance is not possible. Thus, the analysis of magnesium will lead to invalid results.
A high adsorption of magnesium hydroxide sulphate trihydrate is not expected due to the properties of the substance (e.g. water solubility, dissociation in water). For such substances for which a low Koc is expected the batch equilibrium method (OECD 106) is unsuitable. It is required in the guideline that a soil-to-solution ratio should be selected, for which the percentage adsorbed is >20% and preferably >50%, which would not be possible to achieve with magnesium hydroxide sulphate trihydrate even if the soil-to-solution ratio is 1:1.
In summary it is concluded that the performance of an adsorption/desorption study is not feasible and also scientifically not needed for the substance magnesium hydroxide sulphate trihydrate (EC 483-390-9).
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.
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