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LAS-TEA is readily biodegradable. No studies on degradation of LAS-TEA in water-sediment or in soil are available. In accordance with column 2 of REACH Annex IX, the water and sediment simulation test and biodegradation test in soil do not need to be conducted.

Supporting studies are also available for read-across substances, such as LAS-Na, which are also readily biodegradable. The biodegradation of LAS-TEA may be further described by the biodegradation of LAS-Na and TEA according to the read-across statement in which full dissociation of the LAS-TEA in water is supported. For the soil compartment this is relevant for indirect applications via sludge application.


TEA is shown to biodegrade rapidly in both water-sediment and in soil, with maximum half-life times of 1.7 and 1.8 days, respectively. Further maximum mineralisation half-life was determined in water-sediment and in soil of 7.2 and 5.4 days, respectively. In the Guidance on the application of CLP criteria, a substance can be identified as rapidly biodegradable if the measured rate constant in the different environmental compartments is > 0.043 d-1(Guidance on the application of CLP criteria, Guidance to regulation (EC) No 1272/2008 on classification, labelling and packaging (CLP) of substances and mixtures, ANNEX II, 2.3). The measured rate constant for biodegradation and mineralization are all > 0.043 d-1. Therefore, according to CLP criteria, TEA is rapidly biodegradable.


Biodegradation of LAS-Na in sediment is rapid. Mineralization (14CO2 production) was best described by a First Order Model (r2 > 0.99), indicating that parent and metabolites were equally bioavailable to undergo mineralisation. The rate constant for mineralization was 0.06 day-1. Half-life in sludge-amended soil after application of sludge of LAS-Na was >7 -<22 days based on recovered LAS-Na.