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ABIOTIC DEGRADATION INAIR

DIRECT PHOTOLYSIS in air
C20/C22 ATQ 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 C20 ATQ and C22 ATQ can be calculated with US EPA AOPWIN Program estimating low degradation half-lives (C20 homologue 9.7h, C22 homologue 9h). But as C20/22 ATQ has a Henry’s Law Constant of <1.0*10-5Pa*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

C20/C22 ATQ has no functional groups which could be hydrolyzed under envrionmental conditions as stated in OECD Guideline 111.

 

DIRECT PHOTOLYSIS in water
C20/C22 ATQ 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 C20/C22 ATQ in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (C20 homologue 9.7h, C22 homologue 9h). Therefore C20/C22 ATQ may also be degraded in water by indirect photolysis if sufficent OH radicals were available.

ABIOTIC DEGRADATION IN SOIL

 

DIRECT PHOTOLYSIS in soil

C20/C22 ATQ 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 C20/C22 ATQ in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (C20 homologue 9.7h, C22 homologue 9h). Therefore C20/C22 ATQ may be degraded on soil surface by indirect photolysis but as C20/C22 ATQ is rapidly biodegraded in aerobic soils (see IUCLID Section 5.2.3) indirect photolysis will play a minor role in degradation.

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