Registration Dossier

Administrative data

Endpoint:
phototransformation in soil
Type of information:
experimental study
Adequacy of study:
other information
Study period:
no data
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary literature

Data source

Reference
Reference Type:
secondary source
Title:
Water-related environmental fate of 129 priority pollutants Vol. 1
Author:
Callahan MA, Slimak MW, Gabel NW, May IP, Fowler CF, Freed JR, Jennings P, Durfee RL, Whitmore FC, Maestri B, Mabey WR, Holt BR and Gould C
Year:
1979
Bibliographic source:
U.S. EPA 440/4-79-029a

Materials and methods

GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Isophorone, purity not reported
Radiolabelling:
no

Results and discussion

Details on results:
lambda(max) at 312 nm (epsilon = 45 M-1 cm-1).
It was reported that photolysis of isophorone in water at wavelengths >200 nm gave dimerization products. Dimerization products were also found when isophorone was irradiated at >300 nm in organic solvents. Such dimerization products are unlikely in the aquatic environment under the highly dilute environmental conditions.
It was also reported that photolysis of isophorone at >300 nm in air-saturated carbon tetrachloride solution resulted in the loss of isophorone. This information indicates that loss of isophorone could occur via interactions of isophorone with organic substances in aquatic systems.

Applicant's summary and conclusion

Conclusions:
Dimerization of isophorone and reaction of isophorone with other organic substances may be caused by UV irradiation when the concentrations of the reaction partners are sufficiently high.
Executive summary:

Dimerization of isophorone and reaction of isophorone with other organic substances may be caused by UV irradiation when the concentrations of the reaction partners are sufficiently high.