Registration Dossier
Registration Dossier
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EC number: 216-885-3 | CAS number: 1689-99-2
Endpoint summary
Administrative data
Description of key information
Not readily biodegradable (37% in 28 days; OECD Guideline No 301B).
DT50 in sediment at 20 °C: <2 to 4 hours (4.2 to 8.5 hours, recalculated to 12 °C), aerobic conditions
DT50 in sediment at 20 °C: 3.7 days, anaerobic conditions
DT50 = 0.14 to 34.07 days (0.28 to 47.62 days, recalculated to 12 °C), 29.4 – 64.28% degradation after 35 to 90 days, aerobic conditions
DT50 = 0.5 – 0.9 days at 20 °C (1.06 – 1.91 days, recalculated to 12 °C), 68.2 and 14.7% degradation after 121 and 126 days, anaerobic conditions
Additional information
A study was performed to assess the ready biodegradability of 2,6-dibromo-4-cyanophenyl octanoate in an aerobic aqueous medium, according to GLP and OECD Guideline No 301B. The test material attained 37% degradation after 28 days and therefore cannot be considered to be readily biodegradable according to OECD criteria.
A simulation study, according to GLP and BBA Guidelines for the Official Testing of Plant Protection Products, Part IV, Section 5-1 (1990), investigated the aerobic biodegradation of the test substance at 20 °C in aquatic model ecosystems. The formation of 14CO2 after 100 days accounted for 55.2 and 55.4%, respectively, of the applied radioactivity. The determined DT50 of the test compound ranged from <2 to 4 hours (4.2 to 8.5 hours, recalculated to 12 °C). The main degradation product in water and sediment was 3,5 -dibromo-4 -hydroxybenzonitrile.
In soil, the target substance attained 29.4 – 55.1% degradation (elevation of 14CO2) after 35 days and 19.4 °C, and the half-life of the test substance in soil was found to range from 0.14 – 0.62 days (0.28 – 1.25 days, recalculated to 12 °C).
Experimental data on the degradation of 2,6-dibromo-4-cyanophenyl octanoate in surface water is not available. The assessment is therefore based on data available for the structural analogue [14C]- 3,5-dibromo-4-hydroxybenzonitrile (CAS 1689-84-5) . The degradation of [14C]- 3,5-dibromo-4-hydroxybenzonitrile was investigated in natural water samples incubated in the dark under aerobic conditions at a temperature of 20 ± 2 °C in accordance with the OECD Test Guideline No. 309. The test-item remained stable under the conditions of the test (DT50 = >1000 days).
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