1,2-dichloro-3-nitrobenzene

Phototransformation in water

Link to relevant study record(s)

Reference

Endpoint:

phototransformation in water

Type of information:

other: BUA report

Adequacy of study:

other information

Reliability:

other: BUA report

Rationale for reliability incl. deficiencies:

other: No reliability is given as this is a summary entry for the BUA report.

Principles of method if other than guideline:

BUA report

GLP compliance:

not specified

Although 1,2-dichloro-3-nitrobenzene absorbs in the range of wavelength > 290 nm, no reacting of a aqeous solution at irradiation is observed. But in presence of titanium dioxide a rapid photo mineralisation is detected. The tests were conducted concentrations of 7.68 mg/l 1,2-dichloro-3-nitrobenzene and 500 mg/l titanium dioxide (disperse) were used. After 35 minutes 50 % of 1,2-dichloro-3-nitrobenzene were decomposed. After 3 hours 1,2-dichloro-3-nitrobenzene was not yet complete degraded. Primary reaction products are dichloronitrobenzene (mainly 1,2-dichloro-3,5dinitrobenzene) and dichloronitrophenole.

The photocatalytical reaction with titanium dioxide is also possible at sunlight but with lower reaction rate. (Hustert et al., 1987). Indications of photocatalytical degradation were obtain by Kondo et al (1982). A concentration decay of 3.8 % was detected after 5 day storage at pH 7 and 20+/- 5 °C in darkness; in daylight the concentration decay was 7.6%. The interpretation of the values is critical because for the preparation of the solutions acetone was used. Acetone may act as a sensitizer.

Executive summary:

Although 1,2-dichloro-3-nitrobenzene absorbs in the range of wavelength > 290 nm, no reacting of a aqeous solution at irradiation is observed. But in presence of titanium dioxide a rapid photo mineralisation is detected. The tests were conducted concentrations of 7.68 mg/l 1,2-dichloro-3-nitrobenzene and 500 mg/l titanium dioxide (disperse) were used. After 35 minutes 50 % of 1,2-dichloro-3-nitrobenzene were decomposed. After 3 hours 1,2-dichloro-3-nitrobenzene was not yet complete degraded. Primary reaction products are dichloronitrobenzene (mainly 1,2-dichloro-3,5dinitrobenzene) and dichloronitrophenole.

The photocatalytical reaction with titanium dioxide is also possible at sunlight but with lower reaction rate. (Hustert et al., 1987). Indications of photocatalytical degradation were obtain by Kondo et al (1982). A concentration decay of 3.8 % was detected after 5 day storage at pH 7 and 20+/- 5 °C in darkness; in daylight the concentration decay was 7.6%. The interpretation of the values is critical because for the preparation of the solutions acetone was used. Acetone may act as a sensitizer.

Description of key information

For transported isolated intermediates according to Reach, Annex XVIII, 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".

Although 1,2-dichloro-3-nitrobenzene absorbs in the range of wavelength > 290 nm, no reacting of a aqeous solution at irradiation is observed. But in presence of titanium dioxide a rapid photo mineralisation is detected. The tests were conducted concentrations of 7.68 mg/l 1,2-dichloro-3-nitrobenzene and 500 mg/l titanium dioxide (disperse) were used. After 35 minutes 50 % of 1,2-dichloro-3-nitrobenzene were decomposed. After 3 hours 1,2-dichloro-3-nitrobenzene was not yet complete degraded. Primary reaction products are dichloronitrobenzene (mainly 1,2-dichloro-3,5dinitrobenzene) and dichloronitrophenole.

The photocatalytical reaction with titanium dioxide is also possible at sunlight but with lower reaction rate. (Hustert et al., 1987). Indications of photocatalytical degradation were obtain by Kondo et al (1982). A concentration decay of 3.8 % was detected after 5 day storage at pH 7 and 20+/- 5 °C in darkness; in daylight the concentration decay was 7.6%. The interpretation of the values is critical because for the preparation of the solutions acetone was used. Acetone may act as a sensitizer.