Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Water solubility

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-07-07 to 2010-07-15
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed, 2007-03-21
Type of method:
flask method
Water solubility:
12 mg/L
Conc. based on:
element
Remarks:
molybdenum
Loading of aqueous phase:
1 g/L
Incubation duration:
7 d
Temp.:
20 °C
pH:
>= 4.3 - <= 4.5
Water solubility:
0.9 mg/L
Conc. based on:
element
Remarks:
iron
Loading of aqueous phase:
1 g/L
Incubation duration:
7 d
Temp.:
20 °C
pH:
>= 4.3 - <= 4.5
Details on results:
The measured concentrations were neither constant for Mo nor Fe. This is probably due to the fact that the test item, iron molybdate, slowly reacts with water under dissolution. As a result, the solubility equilibrium cannot be established and the guideline criteria of less than 15 % variation is not fulfilled.
Conclusions:
Interpretation of results: slightly soluble (0.1-100 mg/L)
a) A definitive water solubility of iron molybdate could not be determined in this test.
b) Under the conditions of this test (e.g. a loading of ca. 1 g/L iron molbdate, agitation for one week), constantly increasing concentrations over time of dissolved Mo and Fe were detected, reaching approximately 12 mg/L and 0.9 mg/L for Mo and Fe, respectively, at the end of the test (day 7).

Description of key information

An experimental study on the water solubility of iron molybdate was conducted (OECD 105, flask method). Within the one week test period (daily sampling), the measured concentrations increased constantly over time for Mo and Fe. This is probably due to the fact that the test item, iron molybdate, slowly reacts with water under dissolution. As a result, the solubility equilibrium ("saturation") was could not be established (the guideline criteria of less than 15 % variation between subsequent samples is not fulfilled).


Conclusions:


a) A definitive saturation water solubility of iron molybdate could not be determined in this test.


b) Under the conditions of this test (e.g. a loading of ca. 1 g/L iron molybdate, agitation for one week), constantly increasing concentrations over time of dissolved Mo and Fe were detected, reaching approximately 12 mg/L and 0.9 mg/L for Mo and Fe, respectively, at the end of the test (day 7).


In addition to the standard OECD TG 105 water solubility study, the substance has also been tested in a bioelution study (in vitro bioaccessibility) in artificial gastric juice. This test and the results are described in the stand-alone document „MoCon read-across concept (human health)“, which is attached to the technical dossier in IUCLID section 13.

Key value for chemical safety assessment

Additional information