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Environmental fate & pathways

Phototransformation in soil

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Link to relevant study record(s)

Description of key information

Two studies were provided for this endpoint:
In the Hazleton, 1986, study; Dinoseb was added to a California sandy loam soil strips on thin layer chromatography plates and exposed to artificial sunlight. Dinoseb was photodegraded with a half-life of 14 hours. A minimum of four transformation products were detected, however these were not otherwise characterised.
In the Saxena, 1989, study; Dinoseb was added to soil in petri dishes at a concentration of 26 µg/g soil and irradiated with artificial light using a xenon lamp at 25 to 26 ºC. Dinoseb was photodegraded with a half-life of 4.8 lamp days corresponding to 6.2 days of natural sunlight. Low recovery was obtained for the irradiated samples.
Photodegradation was also observed with the artificial light however, no kinetics could be calculated.

Key value for chemical safety assessment

Additional information

These studies were entered for assessment purposes only and are not considered necessary for REACH purposes.

Both are considered to be supporting studies.

- The Hazleton, 1986, study was assigned a reliability rating of 2, according to the criteria of Klimisch, 1997 as the it was unclear if a standard methodology was utilized and if chemical analysis of treatment levels was performed.

- The Saxena, 1989, study was assigned a reliability rating of 1, according to the criteria of Klimisch, 1997 as the study was conducted according to EPA Guideline Subdivision N 161-3 (Photodegradation Studies on Soil) with analytical verification of test concentrations and GLP.