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EC number: 201-052-9
CAS number: 77-73-6
No measurable biodegradation observed over a 28 day testing period.
DCPD/Codimer Concentrate cannot be considerd readily biodegradable
This study was GLP compliant and followed
guidelines. The study is considered adequate for assessment. Under the
test conditions used no biodegradation was observed. DCPD/Codimer had
biodegraded by 0% in 28 days.
DCPD is not readily biodegradable
study for DCPD/Codimer
68478-10-4) was available for review (Exxon Mobil, 2004) and was
considered suitable for read across. The ready biodegradability study
using activated sludge following OECD Guideline 301 F (Ready
Biodegradability: Manometric Respirometry Test) showed no biodegradation
after 28 days. The DCPD/Codimer
Concentrate consists of dicyclopentadiene and codimers of
cyclopentadiene. The substance consists of DCPD along with lower
concentrations of other codimers of cyclopentadiene which have similar
structures to DCPD and are expected to have similar biodegradation
properties. Therefore, read across of this conservative result to DCPD
is considered robust.
from MITI Japan indicating that the substance was not readily
biodegradable was unavailable for review. However, this study is from a
regulatory source and has been used in the OECD SIDS and therefore is
included as a supporting study.
use of a QSAR to predict the biodegradability of
3a,4,7,7a-tetrahydro-4,7-methanoindene is an appropriate technique to
use as part of a weight of evidence approach. The use of BioHCwin and
Biowin is appropriate for 3a,4,7,7a-tetrahydro-4,7-methanoindene as this
compound clearly falls within the applicability domains of these models
as all substructures in 3a,4,7,7a-tetrahydro-4,7-methanoindene are
included in the models. The results from both QSAR indicate that
3a,4,7,7a-tetrahydro-4,7-methanoindene is expected not to be readily
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