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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 N-(3-(tridecyloxy)propyl-1,3-propane diamine, branched monoacetate and N-(3-(tridecyloxy)propyl)-1,3-propane diamine branched in biological wastewater systems through read-across is assessed accordingly; 99.8% removal from the wastewater and 85.6% removal by biodegradation in biological wastewater treatment plants.

Key value for chemical safety assessment

Additional information

N-[3-(tridecyloxy)propyl]-1,3-propane diamine, branched monoacetate and N-[3-(tridecyloxy)propyl]-1,3-propane diamine branched have not been tested in the continuously-fed activated sludge (CAS) test. However, the fate of a chemically related substance i.e. oleyl tripropylene tetramine has been assessed in the CAS tests. Comparable biodegradation potential of the hydrophilic parts of the surfactants (biodegradability of the alkyl parts differ) and the bioavailability are the keys to justification of the use of read-across of the results obtained in a CAS unit fed with domestic wastewater spiked with oleyl tripropylene tetramine. Removal percentage of the parent compound from the influent and removal by biodegradation in the CAS unit are 99.8% and 85.6% respectively (AkzoNobel, 2009)

The removal of N-[3-(tridecyloxy)propyl]-1,3-propane diamine, branched monoacetate and N-[3-(tridecyloxy)propyl]-1,3-propane diamine branched in biological wastewater systems through read-across is assessed accordingly; 99.8% removal from the wastewater and 85.6% removal by biodegradation in biological wastewater treatment plants

The Kpsed was determined as 2010 L/kg. The suggested maximum half-life for an inherently degradable substance with a Kpsoil in the range >1000 L/kg is 30000 days for soil and sediment (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 N-[3 -(tridecyloxy)propyl]-1,3 -propane diamine, branched monoacetate and N-[3 -(tridecyloxy)propyl]-1,3 -propane diamine branched 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).