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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The compound MK92K eluted as multiple peask. Two of these peaks eluted beforre formamide, with a further three peaks eluting between formamide and the lowest calibration standard (Acetanilide). For the components with retention times shorter than that of the lowest standard, the soil adsorption coefficient was considered to be less than that of the lowest standard. For the remaining peaks the results of the estimation may be expected to be realistic, as the results were calculated by interpolation rather than extrapolation. It was possible to establish the calibration line with five different calibration compounds. There were only minimal defferences between the replicates of retention times for each of the reference and test substances, and between the two injection sequences. The resultant calculated values differed only to a small extent and therefore the results may be considered as acceptable for regulatory purposes. The test substance eluted as eleven components with a retention time corresponding to log Koc values of between <1.25 to 5.40, indicating wide range of mobility.

Key value for chemical safety assessment

Additional information

A screening test conducted in accordance with OECD 121 indicated that due to its multi component nature MK92K displayed a range of Log Koc values from <1.25 to 5.40. Similarly, MK92K displayed a range of Log Pow values from <0.3 to 3.93, with a significant proportion of the components having Log Pow values < 3. Whilst there is some potential for adsorption on the basis of these data, it is considered that the significant proportion of MK92K is mobile and water soluble. Additionally, the nature of MK92K makes assessment of hydrolysis 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 there is not considered to be an analytical method that is sufficiently sensitive, and so a more detailed assessment in accordance with OECD 106 for example would not be technically possible.