Dicopper hydroxide phosphate

Endpoint summary

Additional information

The water solubility of the test material has been determined to be 4.73 x 10-2 g/L of solution at 20.0 ± 0.5 °C. The effect of temperature over the range 10 to 30 °C has been considered not to have had a significant influence on the solubility of the test material (range 4.71 x 10-2 to 4.77 x 10-2 g/L). The initial solution pH was also shown to significantly influence solubility of the test material. When using an identical initial saturation period of 72 hours, the use of the pH 4 buffer solution somewhat increased the resulting phosphate concentration dissolved (when compared to unbuffered water) whereas the use of the pH 9 buffer solution slightly decreased the analysed phosphate concentration. It had been anticipated that an acidic pH would suppress solubility. However, although the pH 4 buffer solution was initially more acidic than the unbuffered water, due to its buffering capacity, increased dissolution of the test material occurred before the resulting acidic solution began to suppress test material dissolution. Therefore, although the maximum observed solubility was 0.644 g/L (at a final solution pH of 3.9), the water solubility may increase further in cases where additional buffering capacity exists.

Dicopper hydroxide phosphate is not considered to possess any of the following hazardous physico-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.