1,2,3,4-tetrahydronaphthalene

Phototransformation in water

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

Test material information

Constituent 1

Reference substance name:

Tetrahydronaphthalene

IUPAC Name:

Tetrahydronaphthalene

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

% Degradation

% Degradation 1

% Degr.:

82.9

Sampling time:

43.7 h

Test condition:

Direct photolysis

% Degradation 2

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.