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Environmental fate & pathways

Phototransformation in soil

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Endpoint:
phototransformation in soil
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Endpoint:
phototransformation in soil
Type of information:
other: Technical Discussion
Adequacy of study:
supporting study
Study period:
Not available
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well documented discussion on substance properties
Justification for type of information:
A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Reason / purpose:
read-across: supporting information
Qualifier:
no guideline followed
Principles of method if other than guideline:
Technical discussion
Validity criteria fulfilled:
not specified
Conclusions:
The substance does not exhibit any potential to undergo phototransformation in soil.
Executive summary:

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. Hydrocarbons, C9-C14, n-alkanes, isoalkanes, cyclics, contains hydrocarbon molecules that absorb UV light below 290 nm, a range of UV light that does not reach the earth's surface. Therefore, this substance does not have the potential to undergo photolysis in water and soil, and this fate process will not contribute to a measurable degradative loss of this substance from the environment.

Endpoint:
phototransformation in soil
Type of information:
other: Technical Discussion
Adequacy of study:
supporting study
Study period:
Not available
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well documented discussion on substance properties
Justification for type of information:
A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Reason / purpose:
read-across: supporting information
Qualifier:
no guideline followed
Principles of method if other than guideline:
Technical discussion
Validity criteria fulfilled:
not specified
Conclusions:
The substance does not exhibit any potential to undergo phototransformation in soil.
Executive summary:

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. Hydrocarbons, C9-C14, n-alkanes, isoalkanes, cyclics, contains hydrocarbon molecules that absorb UV light below 290 nm, a range of UV light that does not reach the earth's surface. Therefore, this substance does not have the potential to undergo photolysis in water and soil, and this fate process will not contribute to a measurable degradative loss of this substance from the environment.

Description of key information

Key value for chemical safety assessment

Additional information

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 (2-25% aromatics) 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 soil, and this fate process will not contribute to a measurable degradative loss of these substances from the environment.