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Physical & Chemical properties

Water solubility

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Description of key information

On applying the saturation periods of 24, 48 and 72 hours, the mean dissolved nickel concentration increased from 2.27 x 10-3to 6.62 x 10‑3 g/l of solution at 20.0 ± 0.5°C (equivalent to 3.09 x 10-3to 9.03 x 10-3g/l of dissolved nickel subsulfide).   Therefore, extended saturation periods of 96, 120 and 144 hours were applied to a further three samples. Again no saturation plateau was evident on analysis, with the mean dissolved nickel concentration increasing from 7.35 x 10-3 to 1.16 x 10-2 g/l of solution 20.0 ± 0.5°C across these three samples (equivalent to 1.00 x 10-2 to 1.58 x 10-2 g/l of dissolved nickel subsulfide). Further discussion is provided below. 

Key value for chemical safety assessment

Additional information

Monitoring the total dissolved nickel concentration of the sample solutions, the test material failed to achieve a saturation plateau using the saturation and equilibration periods stated in EC Method A6 and OECD Method 105. On applying the saturation periods of 24, 48 and 72 hours the mean dissolved nickel concentration increased from 2.27 x 10-3 to 6.62 x 10-3 g/l of solution at 20.0 ± 0.5°C (equivalent to 3.09 x 10-3 to 9.03 x 10-3 g/l of dissolved nickel subsulfide). Therefore, extended saturation periods of 96, 120 and 144 hours were applied to a further three samples. Again no saturation plateau was evident on analysis, with the mean dissolved nickel concentration increasing from 7.35 x 10-3 to 1.16 x 10-2 g/l of solution 20.0 ± 0.5°C across these three samples (equivalent to 1.00 x 10-2 to 1.58 x 10-2 g/l of dissolved nickel subsulfide).

In the absence of a saturation plateau even after adaptation of the method guidelines and applying an extended saturation period of 144 hours, it was not considered that a definitive water solubility result could be obtained for the test material. However it is equally important to note that as both ICP and AAS are non-substance specific elemental methods only, the generation of the dissolved nickel content in the sample solutions may also be as a product of transformation as opposed to true dissolution of the parent subsulfide salt.