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Environmental fate & pathways

Phototransformation in air

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Reference
Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Principles of method if other than guideline:
Method: other (calculated)
GLP compliance:
no
Specific details on test material used for the study:
1,2-benzisothiazol-3(2H)-one
Light source:
other: calculation
Key result
DT50:
7.568 h

BIT degrades quickly in the atmosphere by reaction with OH radicals, having a half life of 7.568 hours. Considering the low vapor pressure of BIT (5.8 x 107 hPa), pollution of the air by the use of BIT is not expected.
Validity criteria fulfilled:
yes
Conclusions:
The substance was found to degrade quickly in the atmosphere by reaction with OH radicals, with a half-life of 7.568 h.
Executive summary:

A study was conducted to determine the phototransformation of the substance in air using the AOPWIN program of EPI SUITE (US EPA, 2000). The photochemical and oxidative decomposition of 1,2-benzisothiazol-3(2H)-one in air was evaluated based on theoretical grounds by a calculation according to Atkinson.

Reaction rate constant : kOH = 16.9594 × 10-12 cm3 molecule-1 sec-1

Tropospherical half-life: The half-life of 1,2-benzisothiazol-3(2H)-one in air was estimated to be 7.568 hours using kOH.

The substance was found to degrade quickly in the atmosphere by reaction with OH radicals, with a half-life of 7.568 h.

Description of key information

Key value for chemical safety assessment

Half-life in air:
7.568 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

A study was conducted to determine the phototransformation of the substance in air using the AOPWIN program of EPI SUITE (US EPA, 2000). The photochemical and oxidative decomposition of 1,2-benzisothiazol-3(2H)-one in air was evaluated based on theoretical grounds by a calculation according to Atkinson.

Reaction rate constant : kOH = 16.9594 × 10-12 cm3 molecule-1 sec-1

Tropospherical half-life: The half-life of 1,2-benzisothiazol-3(2H)-one in air was estimated to be 7.568 hours using kOH.

The substance was found to degrade quickly in the atmosphere by reaction with OH radicals, with a half-life of 7.568 h.