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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air is not relevant due to low vapour pressure (0.000161 Pa at 25 °C).

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation of aminoiminomethanesulphinic acid (CAS No. 1758-73-2) in air are available. Results from AOPWIN v1.92 indicate that the substance is susceptible to indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 18.22 h (24 h day; OH-concentration: 0.5E+06 OH/cm³) (Müller, 2013). However, this is not expected to be a relevant environmental fate process, since aminoiminomethanesulphinic acid is not expected to enter the atmospheric compartment based on the low estimated vapour pressure under ambient conditions (0.000161 Pa at 25 °C). As this study is not a standard information requirement in REACh and there is no indication from the Chemical Safety Assessment (CSA) on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary for aminoiminomethanesulphinic acid.