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EC number: 203-328-4 | CAS number: 105-76-0
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
The BCF of 81.34 L/kg wet weight based on a measured log Pow of 3.4 was chosen as the most reliable endpoint.
Key value for chemical safety assessment
- BCF (aquatic species):
- 81.34 L/kg ww
Additional information
According to the requirements of the regulation, a study on bioaccumulation should be conducted if the log Pow of the substance is >= 3. As the measured log Pow of dibutyl maleate is 3.4, the criteria for conducting this study would be fulfilled. However, this value is only curtly above the trigger value of 3.
To decide whether a study on bioaccumulation would be necessary or not, two comparative (Q)SAR calculations were conducted first for the determination of the bioconcentration factor (BCF). For the first one, the measured log Pow of 3.4 was used as the calculation basis. For the second one, the estimated log Pow of 4.16 was taken. The BCF derived from the measured log Pow resulted in 81.34 L/kg wet weight, whereas the BCF based on the estimated value resulted in 258.1 L/kg wet weight, which is about three times higher than the one calculated with the measured value. It can be assumed that a measured BCF value would also be lower than an estimated one.
Furthermore, the modelling approach does not take into account any processes of biotransformation. The metabolism of dibutyl maleate in the liver catalyzed by esterases results in the formation of maleic acid and butanol, thus making it much more hydrophilic resulting in an increased excretion. Based on this, accumulation in the fish body is not expected. A study on bioaccumulation is therefore not necessary.
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