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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
Not stated
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Experiment not conducted to a specific guideline or to GLP. Experimental result supports evidence that TEHP, when bound to particles, is more persistent in the environment than when in gaseous state- allowing long distance travel of the molecule.

Data source

Reference Type:
Heterogeneous OH Initiated Oxidation: A Possible Explanation for the Persistence of Organophosphate Flame Retardants in Air
Liu et al
Bibliographic source:
Environ. Sci. Technol., 48, 1041-1048.

Materials and methods

Test guideline
no guideline followed
Principles of method if other than guideline:
TEHP coated on ammonium sulphate particles and exposed to OH radicals at specific temperature and relative humidity. Degradation of TEHP measured using compact time-of-flight aerosol mass spectrometer (C-ToF-AMS) and second order rate constant determined.
GLP compliance:

Test material

Constituent 1
Chemical structure
Reference substance name:
Tris(2-ethylhexyl) phosphate
EC Number:
EC Name:
Tris(2-ethylhexyl) phosphate
Cas Number:
Molecular formula:
tris(2-ethylhexyl) phosphate
Test material form:
other: liquid
Details on test material:
- Name of test material (as cited in study report): tris-2-ethylhexyl phosphate (TEHP)
mass to charge: 435 mz
vapor pressure: 2.7 × 10^−4 pa
No other information stated.

Results and discussion

Any other information on results incl. tables

Mass spectra of unreacted and reacted TEHP coated particles compared kinetic degradation derived from results (second order rate constant) to determine atmospheric lifetime (4.3 days).

Table 1. Reaction kinetics of TEHP Coated on (NH4)2SO4 at 298K

                 k2 (1013cm3molecule−1s−1)
 exp 1  exp 2  exp 3  exp 4  exp 5  average k2,obs  diffusion corrected k2
 17  15  20  29  23  21 ± 5.5  27 ± 1.9

Table 2. Comparisons between measured and estimated k2 and lifetimes for TEHP

     k2 (1013cm3molecule−1s−1)     Atmospheric Lifetime (days)
 Laboratorya  AOPWINb  Laboratorya  AOPWINb
 2.7 x 10-12  9.8 x 10-11  4.3 (3.5 -5.6)  0.1

a       this study

b       structure activity relationship method (SAR)

Applicant's summary and conclusion

Atmospheric lifetime of TEHP is estimated to be 4.3 days. The data indicates that TEHP is more persistent in the atmospheric environment when it is in particle form versus gas form, potentially facilitating long distance travel of the molecule. This process has been put forward as a potential reason for observation of organophosphate esters in polar regions and other pristine environments.
Executive summary:

TEHP was coated onto ammonium sulphate particles and exposed to OH radicals in a photochemical flow tube at 298K and 38 % RH. The degradation of this particle-bound form of TEHP was observed as a result of OH exposure, as measured using a time-of-flight aerosol mass spectrometer. The derived second order rate constant for the heterogenous loss of TEHP was 2.7 x 10^12 cm3 molecule-1 s-1. Normalised values indicated an atmospheric lifetime of 4.3 days, potentially facilitating long distance atmospheric travel of the molecule.