Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate: Fid-Bau Portal

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Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate

Kutsuna, Shuzo / Chen, Liang / Ohno, Kayo / Tokuhashi, Kazuaki / Sekiya, Akira

AbstractHenry's law constants (H) and hydrolysis rate constants (kh) of two fluorinated esters [CH3C(O)OCH2CF3 and CF3C(O)OCH3] were determined at 278–298K by a column-stripping method. The H value at 298K (H298) and the standard solvation enthalpy for gas-to-liquid transfer (ΔHsol) were determined from the van’t Hoff equation to be $H 298 =0.58±0.04 M atm$ ⁻¹ and $Δ H sol =− 44±3 kJ mol$ ^−
1 for CH3C(O)OCH2CF3, and $H 298 =0.12±0.04 M atm$ ^−
1 and $Δ H sol =− 41±16 kJ mol$ ^−
1for CF3C(O)OCH3. Hydrolysis of CH3C(O)OCH2CF3 was not observed $(k h <7×10$ ^−
5 s ^−
1), whereas the kh value of CF3C(O)OCH3 was determined to be $10$ ^5.3±2.0 exp{ − (5.07±1.27)×10 ³/T } s ^−
1. The effects of pH and metal ions, and the salting-out effects of NaCl were also examined for CH3C(O)OCH2CF3. Dissolution in seawater is expected to be a significant tropospheric sink of these fluorinated esters.

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Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate

Kutsuna, Shuzo / Chen, Liang / Ohno, Kayo / Tokuhashi, Kazuaki / Sekiya, Akira

AbstractHenry's law constants (H) and hydrolysis rate constants (kh) of two fluorinated esters [CH3C(O)OCH2CF3 and CF3C(O)OCH3] were determined at 278–298K by a column-stripping method. The H value at 298K (H298) and the standard solvation enthalpy for gas-to-liquid transfer (ΔHsol) were determined from the van’t Hoff equation to be $H 298 =0.58±0.04 M atm$ ⁻¹ and $Δ H sol =− 44±3 kJ mol$ ^−
1 for CH3C(O)OCH2CF3, and $H 298 =0.12±0.04 M atm$ ^−
1 and $Δ H sol =− 41±16 kJ mol$ ^−
1for CF3C(O)OCH3. Hydrolysis of CH3C(O)OCH2CF3 was not observed $(k h <7×10$ ^−
5 s ^−
1), whereas the kh value of CF3C(O)OCH3 was determined to be $10$ ^5.3±2.0 exp{ − (5.07±1.27)×10 ³/T } s ^−
1. The effects of pH and metal ions, and the salting-out effects of NaCl were also examined for CH3C(O)OCH2CF3. Dissolution in seawater is expected to be a significant tropospheric sink of these fluorinated esters.

Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate

Kutsuna, Shuzo / Chen, Liang / Ohno, Kayo / Tokuhashi, Kazuaki / Sekiya, Akira

AbstractHenry's law constants (H) and hydrolysis rate constants (kh) of two fluorinated esters [CH3C(O)OCH2CF3 and CF3C(O)OCH3] were determined at 278–298K by a column-stripping method. The H value at 298K (H298) and the standard solvation enthalpy for gas-to-liquid transfer (ΔHsol) were determined from the van’t Hoff equation to be $H 298 =0.58±0.04 M atm$ ⁻¹ and $Δ H sol =− 44±3 kJ mol$ ^−
1 for CH3C(O)OCH2CF3, and $H 298 =0.12±0.04 M atm$ ^−
1 and $Δ H sol =− 41±16 kJ mol$ ^−
1for CF3C(O)OCH3. Hydrolysis of CH3C(O)OCH2CF3 was not observed $(k h <7×10$ ^−
5 s ^−
1), whereas the kh value of CF3C(O)OCH3 was determined to be $10$ ^5.3±2.0 exp{ − (5.07±1.27)×10 ³/T } s ^−
1. The effects of pH and metal ions, and the salting-out effects of NaCl were also examined for CH3C(O)OCH2CF3. Dissolution in seawater is expected to be a significant tropospheric sink of these fluorinated esters.

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Titel:

Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate

Beteiligte:

Kutsuna, Shuzo (Autor:in) / Chen, Liang (Autor:in) / Ohno, Kayo (Autor:in) / Tokuhashi, Kazuaki (Autor:in) / Sekiya, Akira (Autor:in)

Erschienen in:

Atmospheric Environment ; 38 ; 725-732

Erscheinungsdatum:

06.10.2003

Format / Umfang:

8 pages

ISSN:

DOI:

https://doi.org/10.1016/j.atmosenv.2003.10.019

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

Fluorinated ester , Gas-to-liquid partitioning , Solubility , Column-stripping method , Atmospheric lifetime

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