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EC number: 405-520-5 | CAS number: 95235-30-6 D-8; DD-8
Endpoint summary
Administrative data
Description of key information
Hydrolysis
D-8 was tested for hydrolytic stability in aqueous solutions according to OECD 111. The pH values tested were 4, 7 and 9. The samples were incubated at 50 °C for 24, 48, 72, 96 and 120 hours. The results showed a recovery of D-8 of more than 96 % for 5 days at 50 °C. Thus, it was concluded that D-8 is hydrolytically stable.
Biodegradation in water: sceening test
In the Modifies Sturm test, D-8 reached ca. 60 % biodegradation at the end of the 39-days exposure. During the standard 28-days OECD exposure, D-8 reached ca. 30 % degradation, therefore, the test item is considered to be inherently biodegradable.
Biodegradation in water: simulation test
D-8 was tested for degradation in an aerobic sewage treatment simulation test in the laboratory according to OECD Guideline 303A. Based on the results of this study, it can be considered that D-8 is well biodegradable (primarily degradation, 85 % based on LOQ) and does not affect the activity of the activated sludge. A clear trend towards mineralisation of D-8 was indicated by the DOC-measurements.
Biodegradation in sediment and/or soil
Direct or indirect exposure to the sediment and soil compartiments is not likely to happen. Therefore, the tests are considered scientifically not justified. The test item is well degradable in aquatic systems. No other effects are expected in soil or sediment.
Bioaccumulation: aquatic/sediment
The BCF for D-8 at a concentration level of 0.2 mg/L were determined to be 27 - 78 at 28 days and at concentration level of 0.02 mg/L to be 40 - 132 at 42 days, respectively.
Adsorption/desorption
At the pH 5.5, the adsorption coefficient Koc was determined to be 258 and the logKoc to be 2.41, respectively. At pH 9.0 Koc was determined to be 28.4 and the logKoc to be 1.45, respectively.
Solubility in organic media - distribution data
The solubility of D-8 does not depend on the initial concentration. The solubility may depend on the duration of mixing. The amount of D-8 solved in organic media was found to be higher than in deionized water. DOC and HPLC-analysis are in good agreement in the range of 20 to 30 mg D-8/L, but more variable at the low concentration level of 10 mg/L.
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