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Environmental fate & pathways

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MTDID 22327 is a member of the Perfluorinated Organic Chemicals, C5-C18 category. It is a liquid at room temperature with a vapor pressure of 213 mm Hg at 20 °C.  MTDID 22327 water solubility values for predominant constituents are 0.679 μg/L to 758 µg/L at ca. 23 - 24 °C.  Its Henry’s law constant is read across from constituents, as range: 171 - 1021 atm∙m³/mol at 22 °C (expressed as the ratio of vapor phase partial pressure over aqueous phase concentration).  MTDID 22327 is manufactured in the EU for the export market.  Limited releases are expected. The vapor pressure, low water solubility and high Henry’s law constant indicate that MTDID 22327 will distribute from any terrestrial compartment into the atmosphere.  Once in the atmospheric compartment, this substance will not partition to terrestrial or aquatic compartments based on the same properties.  Therefore, it will remain in the atmosphere if released during manufacture and packaging.  MTDID 22327 contains no hydrolysable groups and is not biodegradable.  Degradation in the environment is expected to be solely by direct photolysis in the upper atmosphere. An overall lifetime of 1600 - 4000 years is expected through these processes.  The ultimate degradation products are hydrofluoric acid (HF, CAS# 7664-39-3), carbon dioxide, and oxides of nitrogen.  These materials are miscible in water and are completely ionized in rainwater.  They are expected to undergo wet deposition with no further significant transformation upon return to the troposphere.

As MTDID 22327 is a highly fluorinated substance, ozone depletion potential may be of interest.  USEPA states flatly that hydrofluorocarbons do not deplete ozone because they lack chlorine or bromine.  Fluorine radicals do not contribute to ozone depletion because of fast quenching of F* by water or hydrogen donors, slow reaction of FO* radicals with oxygen, and obligate reformation of F* in the pathway (1).  F* radicals are rapidly and irreversibly removed from the atmosphere after quenching as HF.  Therefore, neither MTDID 22327 nor any of its acidic photodegradation products contribute to ozone depletion.  As a fully-fluorinated organic compound with long atmospheric lifetime, global warming potential is high.

MTDID 22327 is not expected to partition to moist soils or surface waters.  Upon accidental, direct release of MTDID 22327 to the aquatic compartment, the chemical is expected to volatilize rapidly.  Members of the Perfluorinated Organic Chemicals, C5-C18 category did not show signs of biodegradation in reliable Closed Bottle (BOD) tests.  In particular, a headspace biodegradation (OECD310) assay of category member FC-770 (perfluoro-N-C1,3-alkyl morpholines) showed no biodegradation.  However, lack of biodegradation of MTDID 22327 in aquatic or terrestrial compartments is not expected to be relevant to MTDID 22327 fate due to rapid volatilization.

Despite the expected range of log Kow values, MTDID 22327 is expected to have little potential to bioaccumulate.  Given its high volatility, it will not exist in aquatic environments or organisms for a sufficient time to allow partitioning into lipid tissues or testing of bioconcentration under relevant conditions.

Please see IUCLID section 13 for the category justification and a matrix of fate and pathway data for members of the Perfluorinated Organic Chemicals C5-C18 category.

References:

1) A.J. Colussi, M.A. Crela. 1994.  Rate of the reaction between oxygen monofluoride and ozone. Implications for the atmospheric role of fluorine.  Chem. Phys. Lett. Vol. 229, pp. 134-138.