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Environmental fate & pathways

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ABIOTIC DEGRADATION IN AIR

DIRECT PHOTOLYSIS in air
PRIMARY ALKYL AMINES do 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 Primary alkyl amines can be estimated with US EPA AOPWIN Program estimating low degradation half-lives.(24 hour day and OH radical concentration of 500000 radicales/cm3) For the C12-C18 saturated homologue half-life 7.1 - 8.4 h are calculated (OH radical reaction). For 18' the half-life is 3.6 h (OH radical reaction) and 2.1 h (Ozone reaction).

Table: OH and Ozone raction half-lives of Primary alkyl amines calculated with US EPA EPIWIN 4.0

  Half-life (h)
Chain lenght OH radicale Ozone
C12 8.40 n.a.
C14 7.90 n.a.
C16 7.50 n.a.
C18 7.10 n.a.
C18' 3.60 2.1

 

ABIOTIC DEGRADATION IN WATER


HYDROLYSIS

PRIMARY ALKYL AMINES have no functional groups which could be hydrolyzed under envrionmental conditions as stated in OECD Guideline 111. In addition PRIMARY ALKYL AMINES are readily biodegradable.

 

DIRECT PHOTOLYSIS in water
PRIMARY ALKYL AMINES do not absorb light >290 nm (ozone band) and therefore a direct photolysis in water will not occur.

INDIRECT PHOTOLYSIS in water

In principal OH radical initiated photodegradation in water is possible..

 

ABIOTIC DEGRADATION IN SOIL

 

DIRECT PHOTOLYSIS in soil

PRIMARY ALKYL AMINES do 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 Primary alkyl amines in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (see chapter 5.1.1). Therefore Primary alkyl amines may be degraded on soil surface by indirect photolysis but as the amines are rapildly biodegraded in aerobic soils (see IUCLID Section 5.2.3) indirect photolysis will play a minor role in degradation.