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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The removal of a chemically closely related fatty amine derivative tall oil, reaction products with N-(2-aminoethyl)piperazine (AkzoNobel 2010a) in a CAS test has been used for read across  to tall oil diethylenetriamine imidazoline. Read across is considered to be justified based on the comparable biodegradation pathways of fatty amide derivatives i.e. hydrolysis, oxidation of the alkyl  hain (primary degradation) and the bioavailability are the keys to justification of the use of read-across of the results obtained CAS unit fed with domestic

wastewater

Key value for chemical safety assessment

Additional information

The Kpsed was determined as 47249 L/kg. The suggested maximum half-life for an inherently degradable substance with a Kpsed in the range >10000 L/kg is 300000 days (at 12 ºC). These values are considered as extremely conservative but in the absence of measured data will be used in the exposure assessment as a worst-case. The half-life of the bioavailable fraction of tall oil diethylenetriamine imidazoline in the water phase of sediments is expected to be in the order of a few days, which is based on experiments with dialkyldimethylammonium salts (van Ginkel et al, 2003).

Biological wastewater treatment

Tall oil diethylenetriamine imidazoline has not been tested in the continuously-fed activated sludge (CAS) test. However, the fate of the chemically strongly related fatty amine derivative tall oil, reaction products with N-(2-aminoethyl)piperazine(AkzoNobel 2010a) has been assessed in a CAS test. Comparable biodegradation pathways of fatty amine derivatives i.e. oxidation of the alkyl chain (primary degradation) and the bioavailability are the keys to justification of the use of read-across of the results obtained CAS unit fed with domestic wastewater. Removal percentages of the parent compounds from the influent and removal by biodegradation in the CAS units are given below.

Surfactant

Removal from wastewater (%)

Removal by biodegradation (%)

Tall oil, reaction products with N-(2-aminoethyl)piperazine(CAS no 92062-17-4)

>99.999

99.96

The removal oftall oil diethylenetriamine imidazoline from wastewater in biological wastewater systems through read-across is assumed to be >99.999%. The removal by biodegradation in biological wastewater treatment is expected to be >99.8%.

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