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Physical & Chemical properties

Water solubility

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Description of key information

Fe3P was found to have a water solubility of ≤ 1 mg/l at 20°C.

Key value for chemical safety assessment

Additional information

A water solubility determination was performed as part of a package of Physicochemical testing (Huntingdon Life Sciences, 2011, Study FGE0002). The water solubility was determined according to OECD Method 105 and EU Method A6, and the study was conducted in compliance with GLP.

Fe3P was found to have a water solubility of ≤ 1 mg/l at 20°C.

On the basis of the low water solubility determined in the OECD105 test, a transformation / dissolution test was conducted according to OECD Test Guideline 29. Using a loading of 1 mg/L Fe3P in pH6 aqueous media, very small quantities of iron, phosphorus, and orthophosphate were measured in the test medium; after 28 days the concentrations of Iron, Phosphorus, and Orthophosphate measured were 12µg/L, 47µg/L, and 31µg/L respectively. It was considered that because these are all naturally-occurring species, and because the concentrations measured over 28 days were extremely low, that the environmental impact of Fe3P in water would be negligible.