Registration Dossier
Registration Dossier
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EC number: 260-252-4 | CAS number: 56539-66-3
Endpoint summary
Administrative data
Description of key information
Phototransformation in air:
Indirect photolysis of MMB is estimated with a degradtion of 50% in 1.1 days under 12h irridation (indirect photolysis) calulated with SRC-AOPWIN v1.90. The estimated rate constant in reaction with OH radicals is estimated with 9.96E-12 cm3/ molecule*s.
Hydrolysis:
MMB is stable in water having a half-life of more than a year at pH 4, 7 and 9 and 25°C.
Biodegradation:
MMB is considered readily biodegradable in water.
Further tests on biodegradation in surface waters, sediments and soils are therefore waived and exposure of sediments or soils to MMB is not expected due to a low adsorption potential (log Koc = 0.41).
Bioaccumulation:
MMB has an estimated log BCF of 0.50 (BCF = 3.16 L/kg ww) which indicated no potential for bioaccumulation in aquatic species, especially fish.
Adsorption / desorption and Henry´s law constant:
QSAR calculations indiate a log Koc value of 0.41. Therefore MMB is not expected to bind to soils but rather, if released, will partition to the water compartment. Henry's law constant is reported as 0.1 Pa x m3/mol. Distribution of MMB which is emitted to water has been modelled. It is not expected that MMB will end in the soil compartment.
Distribution in environmental compartements:
Assuming as a most likely case a 100% release of MMB to water, the McKay Level III calculation predicts 10.1% emitted to air and 0.4 % remaining in the sediment. The model does not predict any emissons to soil.
Additional information
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