Registration Dossier
Registration Dossier
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EC number: 237-997-9 | CAS number: 14154-09-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Experimental data on the adsorption/desorption behaviour oftrimanganese bis(orthophosphate) are not available.
The data on the adsorption /desorption for manganese has been taken from the publically available literature and is considered to be limited. The most relevant value for use in risk assessment is Kd= ca. 1200. This is the lowest available value and therefore is considered to be indicative of metal that is known to partition to organic matter (soils/sediments) as opposed to remaining in the water column and as manganese hydrogen phosphate and manganese bis(dihydrogen phosphate) are both soluble they can be considered to be ‘readily transformed’ in the environment.
The mobility of manganese in soil depends on the cation exchange capacity. Other factors driving manganese mobility are pH, organic matter, and oxygen content. Manganese is particularly mobile at low soil pH (less than 5.5). The availability decreases with increasing pH values (above 6).
The adsorption potential of polyphosphates increases with increasing length of phosphate units i.e. the adsorption potential of triphosphate is higher compared to orthophosphate. Whereas the mobility and solubility in soil increases when the number of phosphate units is decreased, for example by hydrolysis of triphosphate to orthophosphate (Busman 1984).
References
Busman, Lowell Marion, (1984)."Behavior of polyphosphates in soils " RetrospectiveTheses and Dissertations.Paper 8979.
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