Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

ABIOTIC DEGRADATION IN AIR

DIRECT PHOTOLYSIS in air
HYEQS 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 HYEQS can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (C12 homologue 2.8h, C14 homologue 3h). But as HYEQS has a low vapour pressure, high water solubility and therefore a low Henry’s Law Constant of 1.5*10-4Pa*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

HYEQS has no functional groups which could be hydrolyzed under envrionmental conditions as stated in OECD Guideline 111. In addition HYEQS is readily biodegradable.

 

DIRECT PHOTOLYSIS in water
HYEQS 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 HYEQS in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (C12 homologue 2.8h, C14 homologue 3h). Therefore HYEQS may also be degraded in water by indirect photolysis if sufficent OH radicals were available. As HYEQS 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

HYEQS 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 HYEQS in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (C12 homologue 2.8h, C14 homologue 3h). Therefore HYEQS may be degraded on soil surface by indirect photolysis but as HYEQS is rapidly biodegraded in aerobic soils (see IUCLID Section 5.2.3) indirect photolysis will play a minor role in degradation.