Registration Dossier
Registration Dossier
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EC number: 203-400-5 | CAS number: 106-46-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Calamari et al (1982) tested the degradation of 8 and 40 mg/l 1,4 -dichlorobenzene by primary sludge in a respirometer test comparable to a MITI(I) test. The degradation of 8 mg/l concentration reached 100%; 40 mg/l probably had a toxic effect and a degradation rate of 30% at day 28. The publication does not state whether the 10 -day-window criterion was respected or not. By plotting the results on a graph it can clearly be seen that more than 60% were degraded 10 days after reaching 10% biodegradation.
Topping (1987) tested 1,4 -dichlorobenzene for rapid biodegradability in a Closed Bottle Test (OECD guideline D). Disappearance of the substance after 28 days (67%) was confirmed by specific HPLC analysis. Thus, the 60% threshold is passed. Due to the lack of intermediate results it is not possible to conclude whether the 10 -day window is respected or not.
As an intermediate metabolite 3,6 -dichlorobrenzcatechine was identified, which however disappeared after 3 hours. (Schraa 1986).
Under anaerobic conditions with sewage sludge from a domestic sewage treatment plant, the substance degrades up to 80% within 32 days. (Kirk 1989).
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
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