Registration Dossier
Registration Dossier
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EC number: 217-038-0 | CAS number: 1726-23-4
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air
Stability of the substance in the atmosphere was calculated using the computer program AOPWIN (v 1.92). It is predicted that the substance will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals. The half-life for this reaction in air is estimated to be approximately 28 hours.
The overall degradation rate constant with OH radicals is estimated to be equal to 1.19E-06 cm3/(molecule-day).
Hydrolysys
In accordance with REACH Regulation 1907/2006, Annex VIII, Column 2, section 9.2.1.1, hydrolysis as a function of pH does not need to be determined as the substance can be regarded as readily biodegradable.
Biodegradation
Ready biodegradability has been assessed using OECD test method 301C which determined the sustance to be readily biodegradable.
The screening test inherent to the biodegradability of the substance has also been calculated using the software BIOWIN v4.10 which predicts the substance to be readily biodegradable.
These results indicate that tributyl benzene-1,2,4 -tricarboxylate (DIPLAST TM 4) is expected to be readily biodegradable.
In accordance with REACH Regulation 1907/2006/EC (Annex IX - 9.2.1.2 & 9.2.1.4 - column 2) simulation tests of biodegradation in water and sediment do not need to be conducted as the substance can be regarded as biodegradable via common microbial pathways although the rate of degradation is likely to be limited due to limited bioavailability as a result of low water solubility.
Bioaccumulation
The BCF and BAF of the substance were estimated using the software BCFBAF v.3.01 to give respectively values of 231 L/kg ww and 12 L/kg ww.
The Bio Half-Life was estimated to be: 0.0342 days (normalized to 10 g fish at 15 deg C).
The primary biotransformation rate constant (kM) was estimated to be: 20.27 /day (10 gram fish).
It is therefore concluded that the potential for bioaccumulation oftributyl benzene-1,2,4-tricarboxylate (DIPLAST TM 4) is moderate.
Adsorption / desorption
The Soil Adsorption Coefficient (Koc) of DIPLAST TM 4, calculated using the softwareKOCWINv2.00, leads to the following estimated results:
Log Koc= 4.8060 (Koc = 63973 L/kg) (from MCI)
Log Koc= 4.2067 (Koc = 16095 L/kg) (from Log Kow)
Overall, the MCI methodology is somewhat more accurate than the Log Kow methodology, although both methods yield good results, then the Koc estimate value from MCI was selected for the environmental assessment.
According to the McCall classification scheme, this means that the above substance is immobile (Koc > 5000) on soil.
Henry's Law constant
The Henry's Law Constant (HLC) of tributyl benzene-1,2,4-tricarboxylate, calculated using the software HENRYWIN v3.20, leads to the following estimated results:
HLC= 1.87E-03 Pa-m3/mole (bond contribution)
HLC= 4.11E-04 Pa-m3/mole (group contribution)
HLC= 3.84E-02 Pa-m3/mole (VP/WS ratio)
It appears reasonable that the key HLC value, needed for the chemical safety assessment, can be the average of them:
HLC_key=1.36E-02 Pa-m3/mole(1.34E-07 atm-m3/mole)
The above value indicates that the substance is essentially non volatile from surface water.
Distribution modelling
Distribution in environmental compartments has been calculated using a Fugacity model according to Mackay, Level III. The soil (69 %) was then found to be the major target compartment.
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