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Physical & Chemical properties

Water solubility

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Description of key information

Dissolved  boron orthophosphate (GLP, OECD 105, flask method): 
Unbuffered solution: 0.143 g/L (final solution pH 3.1 - 3.5)

Key value for chemical safety assessment

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

Additional information

The water solubility of boron orthophosphate was determined using the flask method in a study conducted according to EU Method A.6 under GLP conditions (O’Connor and Woolley, 2010). The ion chromatography method applied directly quantified the dissolved phosphate content of each sample solution and these have been corrected to equivalent test material concentrations based on the theoretical phosphate content of the test material.The water solubility of the test material has been determined to be approximately 0.143 g/l of solution at 20.0 ± 0.5°C in un-buffered glass double-distilled water, resulting in sample solution pH’s in the range 3.1 to 3.5.

In addition, the water solubility was demonstrated to be both temperature and pH dependent. Solubilities of 9.44 x 10‑2 g/l, 0.121 g/l and 0.143 g/l were determined at test temperatures of 10°C, 20°C and 30°C respectively following a common 72 hour saturation period at 30°C. Increased solubility was observed in both pH 4 buffer solution and pH 9 buffer solution when compared to that observed under identical conditions in un-buffered glass double-distilled water.