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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Phototransformation in air

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Description of key information

The estimated KOH and t1/2 for NPEO using AopWin v1.92 program (EPIWEB v 4.0) were found to be 5.86 x10-11 cm3/molecule-sec and 0.189 days, respectively. There was no significant impact of branching of nonyl chains (isomers) on the phototransformation estimations.

Key value for chemical safety assessment

Half-life in air:
0.189 d
Degradation rate constant with OH radicals:
5.86 cm³ molecule-1 s-1

Additional information

The hydroxyl radical reaction half-life was estimated for NPEO using the AopWin v1.92 program of EPIWEB v 4.0 based on values for the individual constituents, calculated using default parameters of a 12 h day, a hydroxyl radical concentration of 1.5 × 106 molecules (radicals) /cm3 and a hydroxyl rate constant of 5.86 x10-11 cm3/molecule-sec. The final half-life for NPEO was then calculated on a weighted-average basis using the mole fractions of the individual constituents.

Hydroxyl radical reaction half-lives were also estimated for three typical isomers (due to branching) of nonyl chain of NPEO (e.g. 1, 2-dimethyl-1-ethyl-pentyl phenol E-2; 1, 3-dimethyl-1-propyl-butyl phenol E-2; 1-ethyl-1-methyl-hexyl phenol E-2). The KOH values ranged from 58.01 x 10-12 to 58.29 x 10-12 cm3/molecule-sec and the half-life ranged from 0.183-0.184 days. There was no significant impact of branching of nonyl chains (isomers) on the photo-transformation estimations.

The estimated KOH and t1/2 for NPEO using AopWin v1.92 were 5.86 x 10-11 cm3/ molecule-second and 0.189 days, respectively.