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Physical & Chemical properties

Water solubility

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water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2008-01-29 to 2008-04-09
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 105 (Water Solubility)
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Water solubility:
206.5 g/L
Conc. based on:
test mat.
Incubation duration:
>= 96 - <= 144 h
20 °C
Details on results:
The concentration measured between the three sampling dates between 96 hours and 144 hours differed not more than 15 % during the sampling dates and no tendency of increasing values were observed. So a saturation of the water phase with the test item in this period can be assumed and the water solubility is calculated as the mean value of the results between 96 and 144 hours (see attached material).
Interpretation of results: very soluble (> 10000 mg/L)
The water solubility of ammonium heptamolybdate tetrahydrate in bidistilled water (being in equilibrium with atmospheric carbon dioxide) at 20 ± 0.5 °C is determined to be 206.5 g/L. The pH of the saturated solution was pH 5.8.

Description of key information

The water solubility of ammonium molybdate tetrahydrate is 206.5 g/L at 20 °C and pH 5.8.

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

Water solubility:
206.5 g/L
at the temperature of:
20 °C

Additional information