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EC number: 307-301-9
CAS number: 97593-01-6
Category members with carbon number ranges from C6-24 are considered readily biodegradable. Category members with carbon numbers above C24 are not considered readily biodegradable.
large number of ready biodegradation studies following standard OECD
guidelines are available for members of this category. Studies are
available for category members with carbon number ranges from C6 to C28.
When contradictory results are available from biodegradation screening
studies the study which demonstrates the most biodegradation is used in
the risk assessment. Therefore, studies demonstrating ready
biodegradation have been assigned key study status, in preference to
those showing lower rates of degradation. Data has been read across
between category members and used to determine the carbon number above
which ready biodegradation has not been demonstrated.
has been found to be readily biodegradable in a standard biodegradation
screening study (MITI, 1989). The biodegradation of the test substance
was determined by measuring the oxygen consumption, Total Organic Carbon
and concentration of the test substance using GCMS over time. After 28
days >60% biodegradation was observed using each of these measures. The
results based on BOD showed a greater than 20% difference between
replicates. However, this variability was not observed with the other
two measures. Overall, this test demonstrated that hex-1 -ene met the
criteria for readily biodegradability. The
biodegradation of hex-1 -ene was also investigated by Miller and
Watkinson (1985) in a closed bottle test. A maximum of 45%
biodegradation was observed, and so the criterion for ready
biodegradability was not met in this study.
has been found to be readily biodegradable in a biodegradation screening
test (Cidaria, 1995). In this OECD 301F test >80% biodegradation was
observed at day 28, and the 10 day window was met.
with a carbon number range of C10 - 13 have also been found to be
readily biodegradable (Turner and Watkinson, 1985). After 28 days 60
-67% biodegradation was observed, indicating that the test substance is
readily biodegradable. The same study reports results from a Modified
Sturm test which showed 32 -43% biodegradation over 28 days.
and Watkinson (1984) report results from both an OECD 301D and an OECD
301B test with Alkenes C10 - 14. In both cases they found the test item
to be readily biodegradable, but failing the ten day window. However,
OECD guidance states that the 10 day window is not applicable when
testing a mixture of structurally similar chemicals, as here.
with a carbon number range of C11 -12 have been found to be readily
biodegradable in a biodegradation screening test (Cidaria, 1995). In
this OECD 301F test >77% biodegradation was observed at day 28, and the
10 day window was met.
and Watkinson (1985) investigated the biodegradability of tetradec-1
-ene in an OECD 301D closed bottle test. The validity criteria of the
test were met, and tetradec-1 -ene was shown to meet the criteria for
(1995) investigated the biodegradability of hexadec-1 -ene in an OECD
301D closed bottle test. The validity criteria of the test were met, and
hexadec-1-ene was shown to meet the criteria for ready biodegradability.
MITI (1989) report the results of an OECD 301C test with hexadec-1-ene.
Biodegradation after 28 days was reported based on BOD or analysed
concentrations as 55-77% and 81 -95% respectively. Douglas and Halls
(1993) also investigated the biodegradability of hexadec-1-ene in an
OECD 301D test. Biodegradation reached a maximum of 31% after 28 days.
Battersby (1995) also reports that C14 -16 alpha olefins was found to be
readily biodegradable in an OECD 301D test.
Miller and Watkinson (1984) tested alkenes
C15 - 18 in an OECD 301D test. 53 - 66% biodegradation was observed over
28 days. Battersby (1995a) also tested alkenes C15 - 18 in an OECD 301D
test and reported 55 - 61% biodegradation over 28 days. In both cases
although >60% biodegradation was observed the criteria for ready
biodegradability were not met. Miller and Watkinson (1984) also report
the results from an OECD 301B study. 39 - 49% biodegradation was
measured over 28 days. The study was extended to 41 days, but
biodegradation only reached 42 - 52% after this extended period. Taken
together, Miller and Watkinson (1984) and Battersby (1995a) indicate
that alkenes C15-18 only narrowly miss being considered readily
and Watkinson (1985) investigated the biodegradability of octadec-1 -ene
in a test similar to an OECD 301B modified Sturm test and an OECD 301D
closed bottle test. The highest level of biodegradation was observed in
the modified Sturm test. Although >60% biodegradation was observed
within 28 days the 10 -day window criterion was not met. Therefore,
despite reaching a high degree of biodegradation octadec-1 -ene was not
demonstrated to be readily biodegradable. A maximum of 48%
biodegradation was observed in the closed bottle test.
with a carbon number range of C20 -24 have been found to be readily
biodegradable in a biodegradation screening test (Mead, 1998). After 28
days 92% biodegradation was observed in this modified sturm test. This
is supported by another modified Sturm test (Clarke, 2008), where 92%
biodegradation was again observed after 28 days. The 10 day window was
met in this study therefore the substance is considered readily
studies demonstrate that C6, C10, C10-13, C10-14, C11-12, C14, C14-16,
C16 and C20-24 alkenes have been shown to be readily biodegradable.
Alkenes with carbon numbers of C15-18 and C18 have been shown to have
>60% degradation within 28 days, but did not meet all the criteria to be
considered readily biodegradable. Based on these results any category
members with carbon number ranges from C6-24 are considered readily
biodegradable. Category members with carbon numbers above C24 are not
considered readily biodegradable.
A number of studies are also available showing lower levels of
biodegradation for alkenes in the same carbon number ranges, and at
higher carbon number ranges. Due to the variability in results from
ready biodegradation studies, when a study is available demonstrating
ready biodegradation this is reported as the key study. All reliable
results are included in the dossier and the table of results for
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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