Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

Calculation with AOPWIN v1.92 (EPIWIN software by US-EPA), overall gas-phase reaction constant: 44.02 E-12 cm³/molecules-sec (= 0.0000038 cm³/molecules-day) 

Key value for chemical safety assessment

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

Additional information

The phototransformation in air of the substance 1-Propanesulfonic acid, 3-mercapto-, monosodium salt was determined by the computer program AOPWIN v1.92 (EPIWIN software) by US-EPA (Chemservice S.A., 2011). The program estimates the gas-phase reaction rate for the reaction between the most prevalent atmospheric oxidant (hydroxyl radicals) and the target chemical. For the substance an overall gas-phase reaction constant (also called OH rate constant) of 44.02 E-12 cm³/molecules-sec (= 0.0000038 cm³/molecules-day) and an atmospheric half-life of 0.243 days (around 2.913 hours based on a 12h light day) was calculated. Neither an ozone reaction nor any nitrate radical reaction is important for the substance. No GLP criteria are applicable for the usage of this tool, but due to the fact that it is a scientifically accepted calculation method the estimations performed are reliable with restrictions and can be used for the chemical safety assessment.