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Physical & Chemical properties

Stability in organic solvents and identity of relevant degradation products

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The nature of MK92K makes assessment of stability technically challenging. MK92K is considered to be a UVCB substance comprising multiple components, of similar chemical functionality, in varying proportions. A quantitative assessment of these components would therefore present considerable technical difficulty, as it would not be readily apparent for many of the components whether any change had taken place. Were changes to occur they would be considered unlikely to affect the overall nature of the material.
Testing on MK92K where exposure to a solvent would be expected has focussed on water solubility, partition coefficient, and soil adsorption coefficient. In each of these tests the multi component nature of MK92K has been evident from the range of values obtained for the properties under study. For each of these tests MK92K was dispersed in either an entirely aqueous environment or a mixture of organic solvent and water, with analysis occurring relatively soon after the dispersion. The only exception was the water solubility assessment where the samples were re-analysed due to an instrumental problem. This re-analysis produced results of a comparable magnitude to the initial analysis (where a direct comparison was possible) and so stability in the aqueous environment is considered to be demonstrated.

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