Registration Dossier
Registration Dossier
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EC number: 203-696-6 | CAS number: 109-69-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The substance n-butylchloride was described as inherently biodegradable, with poor anaerobic biodegradation.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
One study and several publications were available to estimate the ready biodegradability of 1-chlorobutane.
In the key study, the oxygen consumption of 73.2 mg/L 1-chlorobutane (equivalent to a ThOD of 9.65 per L) was tested in a BODIS test according to the draft of an ISO-Guideline (now ISO DIS 10708). After 28 days, 47.2% of the test substance was found biodegraded (Study director, 1997).
Inherent or partial biodegradation were also supported by four further publications (Hanson & Brusseau 1994, Visscher & Brinkman 1989, Gerhold & Malaney 1966 and Malaney & Gerhold 1962).
Hongwei et al. (2004) tested the anaerobic biodegradability of n-butylchloride according to EPA OTS 796.3140 and found poor anaerobic biodegradation.
Further studies showed that only certain microorganisms that occur naturally to 1 -5% in activated sludges can biodegrade 1-chlorobutane effectively (e.g. Alcaligenes faecalis, Ancylobacter aquaticus, Xanthobacter sp.).
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