2-chlorobenzothiazole

Phototransformation in water

Administrative data

Endpoint:

phototransformation in water

Type of information:

experimental study

Adequacy of study:

other information

Study period:

1990

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Study meets generally accepted scientific principles but was not specifically designed to examine photodegradation

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2003

Report date:

1990

Materials and methods

Study type:

other: Test on stability in water in the light

Principles of method if other than guideline:

Test on stability in water at elevated temperature and diffrent pH values in the light

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

2-chlorobenzothiazole

EC Number:

210-415-0

EC Name:

2-chlorobenzothiazole

Cas Number:

615-20-3

Molecular formula:

C7H4ClNS

IUPAC Name:

2-chloro-1,3-benzothiazole

Details on test material:

Purity > 99 % w/w

Study design

Analytical method:

high-performance liquid chromatography

Details on sampling:

Samples for analysis were taken at 6 or 7 sampling intervals between 0 and 72 hours after start of incubation.

Buffers:

Media (including algae nutrient medium containing trace amounts of inorganic components, e.g. heavy metals) see below
An amount of 2-Chloro-1,3-benzothiazole was dissolved in buffer solution (pH 7 or pH 9) or in nutrient medium. The final initial concentration of the test substance in the different test solutions was 20 mg/l.

Light source:

sunlight

Details on light source:

daylight

Results and discussion

Preliminary study:

in the dark and in the light

Test performance:

no observable decrease in the concentration of the substance, therefore no analytical check for phototransformation products

Predicted environmental photolytic half-life:

no numerical value can be derived

Transformation products:

not measured

Any other information on results incl. tables

no observable decrease in the concentration of the substance in the light, therefore no analytical check for phototransformation products

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

Under the test conditions, no decrease of the concentration of 2-chloro-1,3-benzothiazole was observed, and no phototransformation products were analyzed

Executive summary:

In a test designed to evaluate the stability of the substance in dilute aquatic media in the light and in the presence of air, the concentration of the substance did not decrease during at least three days at 50 °C in buffer at pH 7, in buffer at pH 9, and in a simulated environmental medium (algal nutrient medium containing traces of heavy metals, pH 9 after 3 d). No phototransformation products were analyzed