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EC number: 201-067-0
CAS number: 77-90-7
The photodegradation of
tributyl acetylcitrate in the atmosphere by reaction with OH radicals
was calculated using the computer program EPIWIN (v4.00), AOPWIN
(v1.92). Based on the reaction rate constant k(OH)=14.4562 x 10E-12
cm³/molecule x sec at 25°C and assuming a OH radical concentration of 5
x 10E5 radicals/cm³ (24 -h day) a half-life t1/2of ca.
27 h was calculated. The base-catalysed
hydrolysis rate constant of tributyl acetyl citrate was calculated by
HYDROWIN program (v 2.00) published by the U.S. Environmental Protection
Agency. Tributyl acetyl citrate is in the applicability of the model.
The total aqueous base-catalysed rate constant (Kb) at ph > 8 and 25 °C
has been calculated to be 5.755 x 10E-2 L/mol x sec. Predicted
half-lifes of 3816 y (at pH 4), 3.82 y (at pH 7), 139.4 d (at pH 8) and
13.94 d (at pH 9) indicate moderate to slow hydrolysis of tributyl acety
citrate under environmental conditions.
Biodegradation in water:
biodegradation of tributyl acetyl citrate was investigated in a study
conducted corresponding to OECD Guideline 302C: "Inherent
Biodegradabilty: Modified MITI Test (II)"over
a period of 28 days and using activated sludge as inoculum. The
biodegradation rate was determined by measurement of oxygen consumption.
Inoculum blank and procedural/functional control with the reference
substance aniline were performed.The test item proved to be
inherently biodegradable under
the test conditions employed (82% biodegradation after 28 d). The
functional control reached the pass level >60% after 14 d.
The ready biodegradation of
tributyl acetyl citrate was investigated in a study conducted according
to EU Method C.4-E (Determination of the "Ready" Biodegradability -
Closed Bottle Test; 2008) and OECD Guideline 301 D (Ready
Biodegradability: Closed Bottle Test; 1992) over a period of 28 days and
using a mixed inoculum composed of sewage from a sewage treatment plant
working predominantly on domestic sewage and soil. The test item proved
to be not readily biodegradable under the test conditions employed (16%
biodegradation after 28 d). In the toxicity control containing both test
and reference item 47%biodegradation based on ThOD occurred within 14 d
thus indicating that the test item was not inhibitory at the
concentration tested. The inherent biodegradation of tributyl acetyl
citrate was investigated in a study conducted corresponding to OECD
Guideline 302C: "Inherent Biodegradabilty: Modified MITI Test (II)" over
a period of 28 days and using activated sludge as inoculum. The test
item proved to be inherently biodegradable under the test conditions
employed (82% biodegradation after 28 d).
Biodegradation in soil
From several test results on
mineralization in soil and compost, acetyl tributy citrate can be
classified as readily biodegradable in these substrates. The reduced
degradation in one test with compost could be attributed to deficiencies
in the applied method.
No experimental studies on
bioaccumulation of tributyl acetylcitrate in aquatic and terrestrial
organisms are available.
bioconcentration factor BCF of tributyl acetyl citrate was calculated
using EPIWIN (v 4.0), BCFBAF (v 3.00). The calculation yielded a
BCF=31.57 L/kg wet wt taking into account the measured log Kow of 4.86.
Based on the result, a low potential for bioconcentration is to be
The soil sorption
coefficient Koc of tributyl acetylcitrate was determined using the HPLC
method (OECD 121, EC C.19). The resulting log Koc was 4.271, i.e. Koc =
18664 L/kg. According to the classification scheme of Blume & Ahlsdorf
(1993), tributyl acetylcitrate shows a high (log Kow method) to very
high sorption onto soil organic matter.
Henry's Law constant
Henry's Law constant of
tributyl acetylcitrate was calculated using EPIWIN (v4.0), HENRYWIN
(v3.20). The calculation of Henry's Law constant according to the
equation H=vp/ws yielded a value of 4.434 Pa x m³/mole using a measured
water solubility of 4.49 mg/L and a vapour pressure of 0.000371 mm Hg.
Based on the result, tributyl acetylcitrate can be considered to be
moderately volatile from aqueous solution.
distribution of tributyl acetylcitrate was calculated according to
Mackay Level I (v3.00). The substance is about equally distributed to
air (16.1%); water (10.5%), soil (37.9%) and sediment (35.4%); the
distribution to the other compartments (fish, aerosol, suspended
particles) is negligible.
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