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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Phototransformation in air data were available from Atkinson (1985). The phototransformation in air half-lives of the substances in the category range from 0.24 to 59 days, with methane presenting a half-live of 1907 days, which is 2-3 orders of magnitude higher than the rest.The streams within the category are not expected to undergo hydrolysis in the environment due to a lack of hydrolyzable functional groups.

Experimental biodegradation data is available for some constituents of the category, which indicate in a weight-of-evidence approach that the constituents are expected to biodegrade if released to the environment.

The QSAR predictions (BIOWIN and BioHCwin) add to the weight of evidence that all the constituents of the category can be expected to biodegrade if released to the environment.

Therefore, the category is considered readily biodegradable.

The bioconcentration factor (BCF) values of representative constituents of this category has been predicted using the EPISUITE v4.11 BCFBAF (2017) model, which uses methodology descrived by Arnot-Gobas et al. (2003, 2006, 2008). The predicted BCF values range from 0.9 to 80 L/kg ww. Of the 15 constituents, no one has a BCF value of greater than 2000 L/kg ww.

The predicted log Koc of representative constituents of this category with KOCWIN range from 0.6 to 2.79.

It is not feasible to perform ready biodegradation, simulation and bioaccumulation tests on complex, volatile UVCB, especially in gas substances at standard temperature and pressure.

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