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EC number: 204-694-8 | CAS number: 124-28-7
PHOTODEGRATION IN AIR
Direct Photodegradation in Air
Compounds of the DMA category do not absorb light >290 nm (ozone band) and therefore a direct photolysis in air will not occur.
Indirect Photodegradation in Air
OH radical induced indirect photolysis of substances from the DMA category can be estimated with US EPA AOPWIN Program, estimating low degradation half-lives (12 hour day and OH radical concentration of 1500000 radicals/cm3). For C10 DMA and C18 DMA half-lives of 1.42 h and 1.26 h are calculated, respectively.
PHOTODEGRATION IN WATER
Direct Photodegradation in Water
Substances of the DMA category are unlikely to undergo direct photolytical degradation in the hydrosphere because of the lack of a chromophor.
Indirect Photodegradation in Water
OH radical induced indirect photolysis in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives for the DMA category (C10 DMA 1.42 h, C18 DMA 1.26 h). Therefore DMA category members may also be degraded in water by indirect photolysis if sufficient OH radicals were available. In any case, substances of the DMA category are rapidly biodegraded (see IUCLID Sections 5.2.1 and 5.2.2) and indirect photolysis will play a minor role in degradation
PHOTODEGRATION IN SOIL
Direct Photodegradation in Soil
Substances from the DMA category do not absorb light >290 nm (ozone band) and therefore a direct photolysis on soil surface will not occur.
Indirect Photodegradation in Soil
OH radical induced indirect photolysis of DMA category members in air can be estimated with US EPA AOPWIN Program estimating low degradation half-lives (see chapter 5.1.1). Therefore substances from the DMA category may be degraded on soil surface by indirect photolysis but as the amines are rapidly biodegraded in aerobic soils (see IUCLID Section 5.2.3) indirect photolysis will play a minor role in degradation.
Substances of the DMA category do not have functional groups which can be hydrolyzed under environmental conditions as stated in OECD Guideline 111. In addition substances of the DMA category are readily biodegradable. The statement given above fulfils the requirement for waiving as given in Regulation (EC) 1907/2006 Annex VIII Column 2, 188.8.131.52 which states: The study need not to be conducted if the substance is readily biodegradable.
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