Registration Dossier

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Provides basic data

Data source

Reference
Reference Type:
publication
Title:
The effect of pH on the decomposition of hydrophenols in aqueous solutions by ultraviolet direct photolysis and the ultraviolet-hydrogen peroxide process.
Author:
Shen, Y.S., Lin, C.C.
Year:
2003
Bibliographic source:
Water Environment Research, 75(1): pp. 54-60. Reprinted with permission from Water Environment Federation, Alexandria, Virginia.

Materials and methods

Study type:
other: Direct and indirect photolysis
Test guideline
Qualifier:
according to guideline
Guideline:
other: Direct and indirect photolysis
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Resorcinol
EC Number:
203-585-2
EC Name:
Resorcinol
Cas Number:
108-46-3
Molecular formula:
C6H6O2
IUPAC Name:
benzene-1,3-diol

Results and discussion

% Degradation
% Degr.:
95
Test condition:
Hydroxyl radical destruction

Any other information on results incl. tables


The light absorbance and photolytic properties of catechol and resorcinol were found to be highly dependent on solution pH and can be adequately described with a three-species distribution model. For the UV-H2O2 process, the individual
contribution to the decomposition of pollutants by direct photolysis and indirect hydroxyl radical destruction was
differentiated by studying the linear addition of UV light absorbance of various reactant species. The contribution to
the decomposition of the two hydrophenols by hydroxyl radical destruction was more than 95% in acidic and neutral
solutions for treatment with the UV-H2O2 process.

Applicant's summary and conclusion

Conclusions:
The light absorbance and photolytic properties of catechol and resorcinol were found to be highly dependent on solution pH and can be adequately described with a three-species distribution model. For the UV-H2O2 process, the individual contribution to the decomposition of pollutants by direct photolysis and indirect hydroxyl radical destruction was differentiated by studying the linear addition of UV light absorbance of various reactant species. The contribution to the decomposition of the two hydrophenols by hydroxyl radical destruction was more than 95% in acidic and neutral solutions for treatment with the UV-H2O2 process.