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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air: Key study: The estimated rate constant for the vapor-phase reaction of Calcium Acetate with photochemically-produced hydroxyl radicals has been estimated as 0.0843 E-12 cm3/molecule-sec at 25 ºC. This corresponds to an atmospheric half-life of about 126.85 days (12-hours day) at an atmospheric concentration of 1.5E(+6) hydroxyl radicals per cm3. (Calculation by EPI Suite v3.20, EPA (USA)/ AopWin v1.92).

Key value for chemical safety assessment

Half-life in air:
126.85 d

Additional information

Key study: Calculation by EPI-Suite, EPA (USA) v3.20 / AopWin v1.92 estimate

Atmospheric Oxidation (25 deg C) [AopWin v1.92]:

Hydroxyl Radicals Reaction:

OVERALL OH Rate Constant = 0.0843 E-12 cm3/molecule-sec

Half-Life = 126.850 Days (12-hr day; 1.5E6 OH/cm3)

Ozone Reaction:

No Ozone Reaction Estimation

Fraction sorbed to airborne particulates (phi):

0.000226 (Junge,Mackay)

Note: the sorbed fraction may be resistant to atmospheric oxidation