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Diss Factsheets
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EC number: 201-116-6 | CAS number: 78-42-2
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Justification for type of information:
- 1. SOFTWARE
Individual model KOCWIN included in the Estimation Programs Interface (EPI) Suite.
2. MODEL (incl. version number)
KOCWIN v2.00 included in EPISuite v 4.11, 2000-2012.
3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
A CAS NUMBER was entered in the initial data entry screen. In the structure window, the molecular weight, structural formula and the structure of the input SMILES notation is shown.
4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
a. Defined endpoint: Organic carbon partition coefficient, given as log Koc.
b. Dependent variable: KOCWIN estimates log Koc with two separate estimation methodologies:
(1) Estimation using first order Molecular Connectivity Index (MCI),
(2) Estimation using log Kow (octanol-water partition coefficient)
c. Algorithm:
Log Koc according to MCI method is calculated using the formula:
log Koc = 0.5213 MCI + 0.60 + ΣPfN
(ΣPfN is the sum of all relevant correction factor coefficients multiplied by the number (N) of that factor in each chemical structure)
Log Koc according to the log Kow method is calculated using two formulas (depending on the polarity of the substance):
log Koc = 0.8679 log Kow - 0.0004 (Non-polar substances)
log Koc = 0.55313 log Kow + 0.9251 + ΣPfN (polar substances)
d. Descriptor values:
Log Kow method:
The independent variable input parameter (log Kow) can be either be estimated directly by the programme using the related model KOWWIN v1.68 input model or can be user-entered based on measured experimental data, as applicable.
e. Applicability domain: The minimum and maximum values for molecular weight are the following:
Training Set Molecular Weights: 32.04-665.02 g/mol,
Validation Set Molecular Weights: 27.03-991.15 g/mol
f. Statistics for goodness-of-fit:
Statistical accuracy of MCI methodology for training and validation set:
i. Training without corrections:
Number: 69
R^2 correction coefficient: 0.967
Standard deviation (log Koc): 0.247
Average deviation (log Koc): 0.199
ii. Training with corrections:
Number: 447
R^2 correction coefficient: 0.900
Standard deviation (log Koc): 0.340
Average deviation (log Koc): 0.273
iii. Validation data set:
Number: 158
R^2 correction coefficient: 0.850
Standard deviation (log Koc): 0.583
Average deviation (log Koc): 0.459
Statistical accuracy of Log Koc methodology:
i. Training without corrections:
Number: 68
R^2 correction coefficient: 0.877
Standard deviation: 0.478
Average deviation: 0.371
ii. Training with corrections:
Number: 447
R^2 correction coefficient: 0.855
Standard deviation (log Koc): 0.396
Average deviation (log Koc): 0.307
iii. Validation data set:
Number: 150
R^2 correction coefficient: 0.778
Standard deviation (log Koc): 0.679
Average deviation (log Koc): 0.494
g. Mechanistic interpretation: Log Koc is estimated based on the likeliness of a substance for sorption to surfaces of soil/sediment particles. This characteristic is triggered by lipophilic character of substances but may be modified by certain molecular fragments that need to be considered by application of correction factors. The Log Koc is a physical inherent property used extensively to describe a chemical’s likeliness to adsorb to organic carbon.
h. The uncertainty of the prediction (OECD principle 4): Tris(2-ethylhexyl) phosphate is not highly complex and the rules applied for the substance appear appropriate. An individual uncertainty for the investigated substance is not available.
5. APPLICABILITY DOMAIN
a. Descriptor domains:
i. Molecular weights: With a molecular weight of g/mole the substance is within / out of the range of the training set (32 - 665 g/mol) as well as in the range of the validation set (27 -– 991 g/mol).
ii. Structural fragment domain: Regarding the structure of Tris(2-ethylhexyl) phosphate the fragment descriptors found by the program are complete. For log Koc estimation according to MCI method and log Kow method, one fragment descriptor was applied (OrganoPhosphorus, aliphatic). For estimation of log Koc according to log Kow method the log Kow estimated directly by the programme using the related model KOWWIN v1.68 input model was used.
iii. Mechanism domain: No information available.
iv. Metabolic domain: Not relevant.
b. Structural analogues: not applicable
i. Considerations on structural analogues: not applicable
6. ADEQUACY OF THE RESULT
a. Regulatory purpose: The data may be used under any regulatory purpose.
b. Approach for regulatory interpretation of the model result: If no experimental data are available, the estimated value may be used to fill data gaps needed for hazard and risk assessment, classification and labelling and PBT / vPvB assessment. Further the value is used for other calculations.
c. Outcome: The prediction of organic carbon partition coefficient yields a useful result for further evaluation.
d. Conclusion: The result is considered as useful for regulatory purposes. - Guideline:
- other: REACH Guidance on QSARs R.6
- Principles of method if other than guideline:
- Estimation Program Interface EPI-Suite version 4.11: KOCWIN (v2.00) for the estimation of the organic carbon-normalized sorption coefficient for soil and sediment (Koc).
The Estimation Program Interface was developed by the US Environmental Agency's Office of Pollution Prevention and Toxics, and Syracuse Research Corporation (SRC). © 2000 - 2012 U.S. Environmental Protection Agency for EPI SuiteTM (Published online in November 2012).
Scientific Papers:
Boethling R.S., Howard PH and Meylan W. 2004, Finding and estimating chemical property data for environmental assessment. Environ. Toxicol. Chem. 23: 2290-3308).
Doucette, W.J. 2000. Soil and sediment sorption coefficients. In: Handbook of Property Estimation Methods, Environmental and Health Sciences. R.S. Boethling & D. Mackay (Eds.), Boca Raton, FL: Lewis Publishers (ISBN 1-56670-456-1).
Meylan, W., P.H. Howard and R.S. Boethling. 1992. Molecular topology/fragment contribution method for predicting soil sorption coefficients. Environ. Sci. Technol. 26: 1560-1567.
Sabljic, A. 1984. Predictions of the nature and strength of soil sorption of organic pollutants by molecular topology. J. Agric. Food Chem. 32:243-246.
Sabljic, A. 1987. On the prediction of soil sorption coefficients of organic pollutants from molecular structure: application of molecular topology model. Environ. Sci. Technol. 21:358-66.
Sabljic, A., H. Gusten, H. Verhaar and J. Hermens. 2005. QSAR modeling of soil sorption. Improvements and systematics of log Koc vs. log Kow correlations. Chemosphere 31:4489-4514. (see also Chemosphere 33: 2577).
Schuurmann, G., R. Ebert and R. Kuhne. 2006. Prediction of the sorption of organic compounds into soil organic matter from molecular structure. Environ. Sci. Technol. 40:7005-7011
Software Package:
Estimations Programs Interface for Windows (EPI Suite) v4.11 (November 2012) Available at: http://www.epa.gov/opptintr/exposure/pubs/episuite.htm - GLP compliance:
- no
- Type of method:
- other: Estimation
- Specific details on test material used for the study:
- SMILES: CCCCC(CC)COP(=O)(OCC(CC)CCCC)OCC(CC)CCCC
- Key result
- Type:
- Koc
- Value:
- 2 468 000 L/kg
- Remarks on result:
- other: QSAR predicted value
- Remarks:
- MCI Method
- Type:
- Koc
- Value:
- 1 895 000 L/kg
- Remarks on result:
- other: QSAR predicted value
- Remarks:
- KOW Method
- Conclusions:
- KOCWIN predicts a KOC value of 2.468E+06 L/kg for the registered substance, based on the first-order Sabljic molecular connectivity index (MCI), and a KOC value of 1.895E+06 L/kg based on the log Kow methodology.
- Executive summary:
The adsorption coefficient (KOC) of the registered substance was estimated using the KOCWIN v2.00 QSAR model available from the US EPA.
The estimated adsorption coefficient of the registered substance, based on the first-order Sablljic molecular connectivity index is 2.468E+06 L/kg. Additionally, log Kow methodology predicted a KOC value of 1.895E+06 L/kg, for the registered substance.
According to the Koc values, the registered substance is considered as immobile in soils (McCall et al. 1981).
McCall P.J., Laskowski D.A., Swann R.L., and Dishburger H.J., (1981), “Measurement of sorption coefficients of organic chemicals and their use, in environmental fate analysis”, in Test Protocols for Environmental Fate and Movement of Toxicants. Proceedings of AOAC Symposium, AOAC,Washington DC.
Reference
KOCWIN predicted that tris(2 -ethylhexyl) phosphate has a Koc = 2.468E+06 L/kg, when using the MCI method.
KOCWIN predicted that tris(2 -ethylhexyl) phosphate has a Koc = 1.895E+06 L/kg, when using the log Kow method.
Description of key information
KOCWIN predicted that tris(2 -ethylhexyl) phosphate has a Koc = 2.468E+06 L/kg, when using the MCI method.
KOCWIN predicted that tris(2 -ethylhexyl) phosphate has a Koc = 1.895E+06 L/kg, when using the log Kow method.
Key value for chemical safety assessment
- Koc at 20 °C:
- 10 000
Additional information
Two acceptable (Q)SAR predictions for tris(2 -ethylhexyl) phosphate indicate that the soil adsorption coefficient (Koc) is >10,000 L/kg. When used in exposure modelling, a Koc of 6,000 L/kg results in close to 99 % adsorption and doesn't significantly rise with increasinf Koc. Therefore, the generally accepted limit value of Koc = 10,000 L/kg is used for chemical safety assessment, which is the limit value for EUSES modelling.
[LogKoc: 4.0]
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.
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