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Environmental fate & pathways

Phototransformation in air

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Description of key information

Using the AOPWIN QSAR model, the photochemical degradation rate of 2 -(2 -(2-butoxyethoxy)ethoxy)ethanol in the atmosphere is 51.5 E-12 cm3/molecule-sec, with a resultatnt predicted half live of 2.5 Hrs.
If released to air, a vapor pressure of 2.5X10-3 mm Hg at 25 deg C indicates triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) will exist solely as a vapor in the atmosphere. Vapor-phase triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 7.5 hours.
Alcohols and ethers do not contain chromophores that absorb at wavelengths >290 nm and therefore triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) is not expected to be susceptible to direct photolysis by sunlight.

Key value for chemical safety assessment

Half-life in air:
2.5 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

Using the AOPWIN QSAR model, the photochemical degradation rate of 2 -(2 -(2-butoxyethoxy)ethoxy)ethanol in the atmosphere is 51.5 E-12 cm3/molecule-sec, with a resultant predicted half live of 2.5 Hrs.

OVERALL OH Rate Constant = 51.5446 E-12 cm3/molecule-sec
HALF-LIFE = 0.208 Days (12-hr day; 1.5E6 OH/cm3)
HALF-LIFE = 2.49 Hrs

If released to air, a vapor pressure of 2.5X10-3 mm Hg at 25 deg C indicates triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) will exist solely as a vapor in the atmosphere. Vapor-phase triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 7.5 hours.

Alcohols and ethers do not contain chromophores that absorb at wavelengths >290 nm and therefore triethylene glycol monobutyl ether or (2-(2-(2-butoxyethoxy)ethoxy)ethanol) is not expected to be susceptible to direct photolysis by sunlight.