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EC number: 914-172-8 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate (multi-constituent):
The ranges of MCP and DCP within the reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate are typically 40-75% and 10-40% respectively. The reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate may contain the following main impurities, derived from the production process:
< 10% of Tricalcium phosphate (Hydroxylapatite) EC# 215-145-7
< 5 % of Phosphoric acid EC# 231-633-2
All other impurities > 5% are other inorganic phosphates or other related inorganic substances, similar to the registered substance, and which do not significantly affect its toxicological and ecotoxicological properties. Any hazardous impurities are present at <0.1%.
The reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate has a melting point of >450°C.
The water solubility of the reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate at 20.0±0.5°C, expressed as total dissolved calcium and orthophosphate has been determined according to the table below.
Nominal test item loading rate (g/L) |
Concentration (g/L)
|
As orthophosphate |
As calcium |
|
|
10 |
0.745 |
4.23 |
100 |
7.95 |
40.4 |
Consequently, the results also demonstrated that water solubility may increase further should loading rate be increased. Where 100g/L was loaded the pH of the resulting sample solution was pH 3.5. It was also noted that the pH of the sample solutions in the water solubility study decreased with increased loading rate.
As the substance is a mixture of two inorganic phosphates the substance will have different solubility’s in different pH's. As such it is difficult to determine an overall solubility. However the solubility will be in excess of 10g/L and therefore the test material can be regarded as very soluble.
The reaction mass of calcium bis(dihydrogenorthophosphate) and calcium hydrogenorthophosphate is not considered to possess any of the following hazardous physico-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.
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