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EC number: 203-865-4
CAS number: 111-40-0
Readily Biodegradable in Closed-Bottle test. Inherent (ultimate) biodegradability also demonstrated in OECD 302A (SCAS) test.
Biodegradation is expected to be the dominant process affecting fate of
this substance in the environment. Several biodegradation screening
tests of inherent or ready biodegradability have indicated little or no
biodegradation of the substance. However, evidence from these studies
suggests that results were confounded by toxicity/inhibition of the
microbial inocula by the relatively high concentrations of
diethylenetriamine tested. In one closed-bottle test where the ratio of
test substance to inoculum concentration was low, 87% biodegradation was
observed after 21 days, using an un-acclimated inoculum. Therefore, the
substance can be classified as "readily biodegradable". In this and
other studies, evidence suggests that a relatively long acclimation
period may be required for previously unexposed inocula to attain the
ability to degrade the substance. An inherent biodegradability (OECD
302A, SCAS test) has shown the substance to have potential for inherent
ultimate biodegradability, giving 80 - 90% removal of the applied 20
mg/L DOC as diethylenetriamine, after an approximately 23-day lag
period. Studies on bio-treatability of high salinity wastewater
associated with ethyleneamine production also indicate essentially
complete biodegradation of diethylenetriamine during activated sludge
wastewater treatment. These results for simulated wastewater treatment
conditions are indicative of a "readily biodegradable" substance.
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