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EC number: 201-070-7
CAS number: 77-93-0
Biodegradation in water
Triethyl citrate was tested for its
biodegradability potential according to EU method C.4 -D and OECD
Guideline 301 F (Feil, 2010). Sodium benzoate (purity of 100 %) was used
as reference compound. Also a toxicity control (test item and reference
compound mixed) was run in parallel, to ensure, that the chosen test
concentration was not inhibitory to microorganisms. The mean
biodegradation after 28 days of the test substance was 78 % (ThOD NH4),
further the 10 day window criterion was passed and therefore it is
considered to be readily biodegradable. The reference item sodium
benzoate was sufficiently degraded to 85 % after 14 days and to 88 %
after 28 days of incubation, thus confirming the suitability of the
aerobic activated sludge inoculum used. Furthermore, the test item was
found to be not inhibitory to the aerobic activated sludge micro
organisms and all validity criteria of the test method were met.
Biodegradation in water and sediment
Simulation testing on ultimate degradation
in surface water, information requirement 22.214.171.124 in Annex IX, does not
need to be conducted, as triethyl citrate (TEC) is considered to be
readily biodegradable. The mean biodegradation after 28 days of the
substance was 78%, the 10 day window criterion was passed from day 4
until day 14 [OECD Guideline 301 F, 2010].
Simulation testing on ultimate degradation
in sediment, information requirement 126.96.36.199 in Annex IX, does also not
need to be conducted, as it has been shown in soil biodegradation tests
with the structural analogue acetyl tributyl citrate (CAS 77-90-7; ATBC)
that the test substance is readily biodegradable.
The hazard assessment of TEC reveals neither
a need to classify the substance as dangerous to the environment, nor is
it a PBT or vPvB substance, nor are there any further indications that
the substance may be hazardous to the environment. Therefore, a
simulation test on biodegradation in surface water and sediment is
scientifically not justified.
Biodegradation in soil
Two experimental results are available
regarding biodegradation in soil for triethyl citrate. Both tests are
conducted according to US Guidelines, whereby the methodological
details, test conditions and results are reported in sufficient detail.
One experiment was conducted according to
EPA OPPTS 835.3300 and ASTM D5988, concluding that the test substance
can be considered as readily biodegradable in soil (Farrell, 2000). The
required time for achieving 50 % mineralisation (t50) or 60 %
mineralisation (t60) increased as the substance concentration in the
soil increased. Nevertheless, at all substrate concentrations, net
mineralisation of triethyl citrate was greater than that of the positive
control (cellulose). Moreover, biodegradation of the TEC met or exceeded
the ‘pass levels’ defined in the ASTM, FDA, and EPA guidelines.
Another experiment regarding ultimate
biodegradation was conducted according to ASTM D5338 and ASTM D5988,
whereby actively aerated compost was used as inoculum (Farrell, 2000),
where the mineralisation of the test substance reached 64.9 % ThCO2in
45 days. Both the TEC and cellulose reference achieved total, net
mineralisation values ≥ 50 % ThCO2during the 45-day
test exposure, cellulose was the only test material to exceed the 60 %
ThCO2pass level defined in the ASTM guideline during the test
exposure. Nevertheless, the calculated t60for the TEC was 53
days – well within the time limit defined in ASTM Standard D 6002 (i.e.,
during a test exposure of up to 180 days).
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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