Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Abiotic degradation in air

Direct photolysis in air

SAS does not absorb light > 290 nm (ozone band) and therefore a direct photolysis in air will not occur.

Indirect photolysis in air

OH-radical induced indirect photolysis of SAS can be calculated with US EPA AOPWIN program estimating a low degradation half-life of 0.9d. But as SAS has a Henry’s Law Constant of 4.7*10 -7Pa*m3/mole (see IUCLID Sections 4.6 & 4.8), volatilisation is not an exposure route which has to be considered. 

Abiotic degradation in water

Hydrolysis

SAS has no functional groups which could be hydrolysed under environmental conditions as stated in OECD guideline 111. In addition, SAS is readily biodegradable.

Direct photolysis in water

SAS does not absorb light > 290 nm (ozone band) and therefore a direct photolysis in water will not occur.

Indirect photolysis in water

OH-radical induced indirect photolysis of SAS in air can be estimated with US EPA AOPWIN program estimating a low degradation half-life of 0.9 d. Therefore, SAS may also be degraded in water by indirect photolysis if sufficient OH radicals were available. As SAS is rapidly biodegraded in surface water (see IUCLID Section 5.2.2) indirect photolysis will play a minor role in degradation.

Abiotic degradation in soil

Direct photolysis in soil

SAS does not absorb light > 290 nm (ozone band) and therefore a direct photolysis on soil surface will not occur.

Indirect photolysis in soil

OH-radical induced indirect photolysis of SAS in air can be estimated with US EPA AOPWIN Program estimating a low degradation half-life of 0.9 d. Therefore, SAS may be degraded on soil surface by indirect photolysis but as SAS is rapidly biodegraded in aerobic soils (see IUCLID Section 5.2.3) indirect photolysis will play a minor role in degradation.