Registration Dossier

Environmental fate & pathways

Endpoint summary

Currently viewing:

Administrative data

Description of key information

Phototransformation in air

The phototransformation in air was estimated from the AOPWIN v1.92 calculations of phototransformation.

 

The phototransformation rate of decane is 11.11 x 10-12 cm3/molecule/sec. The calculated half-life is 0.963 d (11.552 hrs). This value is largely below the trigger limit (2 days). Therefore, decane is not persistent.

 

The phototransformation rate of undecane is 12.52 x 10-12 cm3/molecule/sec. The calculated half-life is 0.854 d (10.249 hrs). This value is largely below the trigger limit (2 days). Therefore, undecane is not persistent.

 

The phototransformation rate for dodecane is 13.94 x 10-12 cm3/molecule/sec. The calculated half-life is 0.767 d (9.210 hrs). This value is largely below the trigger limit (2 days). Therefore, dodecane is not persistent.

 

The phototransformation rate of tetradecane is 16.76 x 10-12 cm3/molecule/sec. The calculated half-life is 0.638 d (7.657 hrs). This value is largely below the trigger limit (2 days). Therefore, tetradecane is not persistent.

Hydrolysis

Hydrolysis is a reaction in which a water molecule or hydroxide ion substitutes for another atom or group of atoms present in a chemical resulting in a structural change of that chemical. Potentially hydrolyzable groups include alkyl halides, amides, carbamates, carboxylic acid esters and lactones, epoxides, phosphate esters, and sulfonic acid esters. The lack of a suitable leaving group renders compounds resistant to hydrolysis

The chemical constituents that comprise C9-14 Aliphatics (≤ 2% aromatic) consist entirely of carbon and hydrogen and do not contain hydrolyzable groups. As such, they have a very low potential to hydrolyze. Therefore, this degradative process will not contribute to their removal from the environment.

Phototransformation in water

The direct photolysis of an organic molecule occurs when it absorbs sufficient light energy to result in a structural transformation. The absorption of light in the ultra violet (UV)-visible range, 110-750 nm, can result in the electronic excitation of an organic molecule. The stratospheric ozone layer prevents UV light of less than 290 nm from reaching the earth's surface. Therefore, only light at wavelengths between 290 and 750 nm can result in photochemical transformations in the environment.

A conservative approach to estimating a photochemical degradation rate is to assume that degradation will occur in proportion to the amount of light wavelengths >290 nm absorbed by the molecule. C9-14 Aliphatics (≤ 2% aromatic) contain hydrocarbon molecules that absorb UV light below 290 nm, a range of UV light that does not reach the earth's surface. Therefore, these substances do not have the potential to undergo photolysis in water and soil, and this fate process will not contribute to a measurable degradative loss of these substances from the environment.

Phototransformation in soil

The direct photolysis of an organic molecule occurs when it absorbs sufficient light energy to result in a structural transformation. The absorption of light in the ultra violet (UV)-visible range, 110-750 nm, can result in the electronic excitation of an organic molecule. The stratospheric ozone layer prevents UV light of less than 290 nm from reaching the earth's surface. Therefore, only light at wavelengths between 290 and 750 nm can result in photochemical transformations in the environment.

A conservative approach to estimating a photochemical degradation rate is to assume that degradation will occur in proportion to the amount of light wavelengths >290 nm absorbed by the molecule. C9-14 Aliphatics (≤ 2% aromatic) contain hydrocarbon molecules that absorb UV light below 290 nm, a range of UV light that does not reach the earth's surface. Therefore, these substances do not have the potential to undergo photolysis in water and soil, and this fate process will not contribute to a measurable degradative loss of these substances from the environment.

Additional information