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Environmental fate & pathways

Phototransformation in water

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Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
other information
Study period:
1983-07-19 to 1983-07-22
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1986
Report Date:
1983

Materials and methods

Study type:
direct photolysis
Principles of method if other than guideline:
see Test Conditions
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
1,2,3,4-tetrahydronaphthalene obtained from Fluka AG, purity > 97%

Study design

Analytical method:
high-performance liquid chromatography
Buffers:
no
Light source:
sunlight
Relative light intensity:
1
Details on light source:
Direct exposure to sunlight
Details on test conditions:
(1) Dissolution of test substance in water
(2) Determination of UV/VIS absorption 280 - 600 nm
(3) Dilution to < 0.1 absorbance (for all wavelengths > 290 nm) if  necessary (not necessary for tetrahydronaphthalene)
(4) Exposure to sunlight in glass stoppered, 32 x 200 mm quartz test  tubes (autoclaved prior to test to avoid biodegradation); sunlight time:  43.7 hours; sunny weather, area free from shade; 3-5 flasks
(5) 1 Flask removed daily for analysis by HPLC
(6) negative control: identical solutions in glass tubes wrapped in  aluminum foil; concentration: 45.0 mg/l; 2-3 replicates
Duration of test at given test condition
Duration:
43.7 h
Initial conc. measured:
45 mg/L
Reference substance:
no
Dark controls:
yes

Results and discussion

% Degradationopen allclose all
% Degr.:
82.9
Sampling time:
43.7 h
Test condition:
Direct photolysis
Test condition:
Indirect photolysis
Dissipation half-life of parent compound
DT50:
ca. 17 h
Transformation products:
not measured

Any other information on results incl. tables

No absorbance peaks above 190 nm; 
test substance concentration after exposure time = 7.7 mg/l

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The direct photolysis of 1,2,3,4-tetrahydronaphthalene in approximately saturated aqueous solution was studied using direct exposure to sunlight and HPLC analysis with UV detection. 82.9 % degradation in 43.7 hours was observed corresponding to a half-life of approx. 17 hours.
Executive summary:

The direct photolysis of 1,2,3,4-tetrahydronaphthalene in approximately saturated aqueous solution was studied using direct exposure to sunlight and HPLC analysis with UV detection. 82.9 % degradation in 43.7 hours was observed corresponding to a half-life of approx. 17 hours.