3-nitrotoluene

Phototransformation in water

Link to relevant study record(s)

Reference

Endpoint:

phototransformation in water

Type of information:

experimental study

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Study type:

direct photolysis

Principles of method if other than guideline:

see Method

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material (as cited in study report): 3-Nitrotoluene
- Analytical purity: no data

Analytical method:

high-performance liquid chromatography

Light source:

sunlight

Light spectrum: wavelength in nm:

366

Details on light source:

A merry-go-round photoreactor (Moses et al., 1969) equipped with a 450 W mercury lamp and Corning 0-52 and 7-37 filters to isolate the 366-nm line was used for the monochromatic light exposures.

Dark controls:

yes

Computational methods:

Rate constant for photoreaction represents the disappearance rate constant incorporating both corrections for variation in light intensity during exposure as well as light attenuation effects by the
humus solutions.

Quantum yield (for direct photolysis):

0.02

Predicted environmental photolytic half-life:

A half-life of 2.6 hours can be derived under the conditions of latitude 40°N in surface waters. It has to be kept in mind that this half-life cannot be transferred directly to environmental conditions because the photolytical active zone is only close to the surface of surface waters due to turbidity and absorption.

It was observed that the photodegradation in pure water is slower than in natural water. The photodegradation depends on the content in humic acid and nitrates, which is higher in natural water.

Executive summary:

Simmons, 1986

A half-life of 2.6 hours can be derived under the conditions of latitude 40°N in surface waters. It has to be kept in mind that this half-life cannot be transferred directly to environmental conditions because the photolytical active zone is only close to the surface of surface waters due to turbidity and absorption.

It was observed that the photodegradation in pure water is slower than in natural water. The photodegradation depends on the content in humic acid and nitrates, which is higher in natural water.

Description of key information

For transported isolated intermediates according to REACh, Article 18, this endpoint is not a data requirement. However, data is available for this endpoint and is thus reported under the guidance of "all available data".

Simmons, 1986

A half-life of 2.6 hours can be derived under the conditions of latitude 40°N in surface waters. It has to be kept in mind that this half-life cannot be transferred directly to environmental conditions because the photolytical active zone is only close to the surface of surface waters due to turbidity and absorption.

It was observed that the photodegradation in pure water is slower than in natural water. The photodegradation depends on the content in humic acid and nitrates, which is higher in natural water.