Registration Dossier

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1981

Materials and methods

Principles of method if other than guideline:
To determine the extent of photodegradation of aqueous sodium salt solutions of 2, 4, 6-trihydroxy-1,3,5-triazine in pH 7.5 phosphate buffers under simulated sunlight irradiation.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): 2,4,6-trihydroxy-1,3,5-triazine (cyanuric acid)
- Analytical purity: 99.6%
- Lot/batch No.: E504-14-3 (FMC)

Study design

Radiolabelling:
no
Analytical method:
other: Differential pulse polarographic measurements
Buffers:
Buffer solutions of sodium phosphate monobasic, monohydrate was prepared and the pH adjusted to pH 7.5 with sodium hydroxide. The solutions were made with distilled water, tap water and well water.
Light source:
other: GE 20 watt F20T12.BL Blacklight fluorescent lamp
Details on test conditions:
TEST SYSTEM
- Type, material and volume of test apparatus/vessels: Photoreactor built from two borosilicate glass tubes of 1.5 and 3.0 inches in diameter with a volume capacity if about 1000 ml.
- Details of traps for volatile, if any: The air inlet was replaced by an absorbent tube filled with 6 inches of Tenax to collect any gaseous products.


TEST MEDIUM
- Volume used/treatment 850 ml
- Kind and purity of water: Distilled, tap and well water


REPLICATION
- No. of replicates (dark): 1
- No. of replicates (irradiated): 2


OTHER
-Temp: The temperature of solution was observed to fluctuate between 23ºC and 27ºC throughout tre study.
Duration of test at given test condition
Duration:
30 d
Temp.:
25 °C
Initial conc. measured:
100 mg/L
Dark controls:
yes

Results and discussion

Transformation products:
no

Applicant's summary and conclusion

Conclusions:
There was no significant change in the concentration of 2,4,6-trihydroxy-1,3,5-triazine in both the sample and control solutions over the 30 day period and therefore no photodegradation occurred during the experimental period.