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EC number: 201-622-7
CAS number: 85-68-7
Benzyl butyl phthalate is readily biodegradable.
Data is available from multiple studies. All
indicate that benzyl butyl phthalate biodegrades rapidly.
CITI Japan (1992) report that in an OECD
301C test benzyl butyl phthalate degraded by 81 % over 2 weeks. The
innoculum was activated sludge. This value is used by the EU RAR to
determine that the substance is readily biodegradable. This is used as a
The two other tests which are of sufficient
quality to be key studies are tests for inherent biodegrability.
inherent biodegradability study by Saeger and Tucker (1976), with
domestic sewage as the inoculum, showed >93% degradation of benzyl butyl
phthalate within 24 hours. This near-guideline publication is used as a
inherent biodegradability study by Suggart et. al (1984) had adapted
domestic sewage as the inoculum. Mean primary degradation was 77.7% with
pooled phthalate acid ester inoculum. With inoculum adapted only to BBP,
primary degradation was 97% and ultimate degradation was 88%. Therefore
in the test system used, BBP was found to be extensively biodegradable.
This near-guideline publication is used as a key study.
(1976) performed tests using the Thomspon-Duthie-Sturm procedure, the
Semi-Continuous Activated Sludge Procedure and a River Die-Away
procedure. All indicated a high biodegradability of the test substance.
These results were used as supporting studies.
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