Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

No data is available for L-threonine mother liquor. Henry's Law constant of threonine as the main constituent of L-threonine mother liquor was calculated using EPIWIN (v4.0), HENRYWIN (v3.20). The calculation of Henry's Law constant according to the equation H=vp/ws yielded a value of 7.34E-009 Pa x m3/mole using an estimated water solubility of 2.79e+005 mg/l and a vapour pressure of 7.88E-009 mm Hg. Based on the result, threonine can be considered as practically non-volatile from aqueous solution.

Experimental studies on adsorption/desorption of L-threonine mother liquor are not available.

According to REACH Regulation (Annex VIII, 9.3.1, column II), the study on adsorption/desorption does not need to be done if the the test material is readily biodegradable. Biofert Plusz (mixture of L-threonine mother liquor and modified waste) proved to be readily biodegradable. Based on the composition of Biofert Plusz this statement applies likewise to the test material under investigation (L-threonine mother liquor).

L-Threonine mother liquor is a complex mixture containing organic and inorganic components (UVCB-substance). Based on the log Kow of the lead component L-threonine of L-threonine mother liquor (-2.94; Hansch, 1995) the sorption onto sediment organic matter is expected to be negligible.