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Environmental fate & pathways

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L-Threonine is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life of about 8.224 hours taking into account a 24 -h day and a mean OH radical concentration of 0.5E06 radicals per cm3. It does not contain chromophores that absorb at wavelengths > 290 nm and therefore is not expected to be susceptible to direct photolysis by sunlight.

L-Threonine is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyse under environmental conditions.

L-Threonine is readily biodegradable under aerobic and anaerobic conditions.

Due to the low logKow and its physiological role L-threonine is considered to have a low potential for bioaccumulation/bioconcentration in organisms.

The logKoc of L-threonine is estimated to be below -1 , using the software program KOCWIN as well as using the software program ACD/LogD Suite, Version 12.0. This indicates a high mobility in soil.

L-Threonine exists as zwitterion in the environment. Volatilization from moist soil surfaces and water surfaces will not occur as ionic compounds do not volatilize.