Registration Dossier
Registration Dossier
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EC number: 235-649-0 | CAS number: 12410-14-9
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Initially very soluble (>>10 g/L), rapid transformation/speciation in environmental waters and body fluids
Initial solubilities cannot be determined for FeClSO4 as the dry salt is not stable
Key value for chemical safety assessment
Additional information
- OECD Organisation for Economic Co-operation and Development (2007). SIDS Initial Assessment Report for SIAM 24. Chemical Category: Iron Salts. Self-published, Paris, France, 17-20 April. 138 p.
Testing for this endpoint has been waived in accordance with column 2 restrictions. All soluble iron salts dissociate in aqueous media to the respective anions and kations, and are then subject to further change of oxidation and speciated state according to the conditions. Thus the salts are not stable and undergo fast hydrolysis (DT50 < 12 h) in water, particularly if oxygen is present and the pH is in the common environmental ranges. Nonetheless a number of generally high initial water solubilities are published, which are reported in the following paragraphs. Comparably aqueous solutions are initially (i.e. before transformation/speciation) unlimitedly miscible with water and water solubility is not a relevant endpoint for them, as they are unlimitedly miscible with water.
Ferric chloride sulphate (FeClSO4)
It is not possible to prepare the sample in solid form for testing and the salt is marketed as watery solution only.
Ferric and ferrous kations
The following Table below shows the maximum dissolved concentration of the iron kations in pure water as it depends upon pH (see section on Hydrolysis).
Table: Calculated maximum solubility of iron in solution at 20 °C depending on pH (OECD 2007, table 13, p 33)
pH |
Ferrous iron (II) |
Ferric iron (III) |
||
[mg Fe/L] |
[mmol/L] |
[mg Fe/L] |
[mmol/L] |
|
4 |
>1E+06 |
>1.8E+04 |
6.16E-02 |
1.1E-03 |
5 |
>1E+06 |
>1.8E+04 |
6.16E-05 |
1.1E-06 |
6 |
>1E+06 |
>1.8E+04 |
6.16E-08 |
1.1E-09 |
7 |
89600 |
1600 |
6.16E-11 |
1.1E-12 |
8 |
896 |
16 |
6.16E-14 |
1.1E-15 |
In conclusion the limit of the ferric iron kation solubility is even at significantly acidified conditions is of the order of ng Fe(III)/L.
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