Registration Dossier
Registration Dossier
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EC number: 235-115-7 | CAS number: 12069-89-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
In a weight-of-evidence approach results are presented on the behaviour of Mo in natural samples (water, sediment, soil, suspended matter). In the reported environmental studies, analytical methods were used which are expected to provide relevant and reliable concentration levels of Mo in water and suspended matter/sediment/soil, respectively.
Key value for chemical safety assessment
Additional information
No data is available for dimolybdenum carbide (target substance). In a weight-of-evidence approach results are presented on the behaviour of Mo in natural samples (water, sediment, soil, suspended matter) at environmentally relevant temperatures. In the reported environmental studies, analytical methods were used which are expected to provide relevant and reliable concentration levels of Mo in water and suspended matter/sediment/soil, respectively. Kd values for the sediment-water system (log Kp, sediment-water) are in the range between 2.65 and 4.26, with typical EU country-specific values of 3.25 (Salminen et al., 2005). This range is consistent with the findings of the other presented studies, also reporting levels from further regions in the world. Values for the partitioning between suspended matter and water range from log Kp (suspended matter-water) = 2.19 (Popp and Laquer, 1980) to 3.9 (Neal et al., 2000), with a grand mean of 3.25, while the log Kp values for soil or soil-influenced systems range from 1.56 (Fox and Donner, 2003) to 2.6 (Buchter et al., 1989). The latter data were part of the data set that was used by Bockting et al. (1992) for deriving a typical log Kd (soil) of 2.94 for molybdenum, which was later accepted by RIVM as a relevant Kd soil for molybdenum (Crommentuijn et al., 1997).)
Other adsorption coefficient indicated as dimensionless:
- log Kp (suspended matter-water) ,3.25
- log Kp (sediment-water) ,3.25
- log Kp (soil-water) ,2.94
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